bluuebunny/crossref_metadata_2025 huggingface dataset:
L’usage de l’informatique par les élèves dyslexiques : un outil de compensation à l’épreuve de l’inclusion scolaire
Authors: Bacquelé Vanessa
Published: June 2015

La possibilité offerte aux enfants dyslexiques de contourner ou surmonter leurs difficultés en langage écrit grâce à l’utilisation d’outils informatiques suscite depuis quelques années beaucoup d’espoir, mais aussi bon nombre d’interrogations. La mise en place de cette aide dans le cadre des classes ordinaires comme son usage au quotidien rencontre de multiples obstacles et plusieurs types de contraintes qui peuvent mettre en péril le projet de l’enfant, s’ils ne sont pas pris en compte. Nous allons essayer de comprendre comment le recours à l’informatique par les élèves dyslexiques, dans le cadre d’une scolarisation dans le second degré et dans la perspective d’une compensation des troubles du langage écrit, est étroitement dépendant d’une réflexion d’ordre technologique qui ne peut faire l’impasse de la singularité de l’utilisateur du matériel ni de son contexte d’utilisation.
Adaptation des TIC dans un contexte pédagogique pour des élèves en situation de multi-handicap
Authors: Roche Amélie , Lespinet-Najib Véronique , Demanes Valérie , Fermingier Isabelle , André Jean-Marc
Published: June 2015

Ce travail présente une méthode de conception systémique fondée sur le design universel et la conception centrée utilisateurs (CCU), permettant de proposer des outils et services qui répondent aux besoins et attentes des populations dites fragiles. Cette méthode a été testée dans un contexte pédagogique auprès d’enfants en situation de multihandicap. L’objectif est de fournir un outil d’aide pour l’apprentissage de la lecture. Selon la démarche proposée et afin d’offrir une solution adaptée, nous avons mis en place des phases successives et itératives lors desquelles nous mettons en relation les profils utilisateurs (en termes de capacités cognitives, sensorielles et motrices, de besoins et de points forts des enfants) ; les situations d’actions caractéristiques (exercices issus de la méthode d’acquisition de la lecture mise en place par l’enseignante) et le contexte. Nous avons ainsi conçu un outil numérique permettant aux enfants de réaliser des exercices de lecture avec plus d’autonomie. Différents prototypes ont été testés selon la démarche de CCU. Les résultats sont concluants : l’expérience utilisateurs des élèves et l’acceptabilité de l’outil sont très satisfaisantes. Celui-ci répond aux besoins et attentes des élèves ainsi qu’à ceux de l’enseignant. Ces premiers travaux montrent que notre méthode de conception systémique semble être pertinente.
Les TIC, les médias sociaux et les étudiants et diplômés canadiens en situation de handicap
Authors: Nguyen Mai Nhu , Budd Jillian , Fichten Catherine S. , Asuncion Jennison V.
Published: June 2015

L’objectif de cette étude est d’explorer l’utilisation des médias sociaux par 133 étudiants et 20 diplômés en situation de handicap des établissements postsecondaires au Canada ainsi que l’accessibilité de ces outils. Les résultats montrent que les trois médias sociaux les plus accessibles pour l’ensemble de l’échantillon étaient Windows Live Messenger (dorénavant intégré à Skype), Blogger et Facebook. Les trois médias sociaux les moins accessibles étaient MySpace, LinkedIn et YouTube. Les données réparties par situation de handicap sont également présentées. En général, les problèmes d’accessibilité sont reliés à l’incompatibilité des technologies adaptées avec certains médias sociaux, à la visibilité et à la mise en page du contenu, ainsi qu’à l’absence de sous-titres. Les participants suggèrent aux développeurs de simplifier la mise en page des médias sociaux et de rendre la navigation plus conviviale.
L’inclusion scolaire à l’heure des TIC : Perspective franco-japonaise
Authors: Mithout Anne-Lise
Published: June 2015

Les technologies de l’information et de la communication offrent de nombreuses ressources pour l’éducation des enfants déficients visuels. Elles rendent aisément accessibles tous les supports pédagogiques et sont ainsi envisagées comme un vecteur d’inclusion. Dans quelle mesure ce lien se vérifie-t-il en pratique ? Par la comparaison entre la France et le Japon, on montrera que, à niveau de technologie équivalent, on peut observer une appropriation radicalement différente des TIC à destination des enfants déficients visuels dans le système éducatif et que, dans le cadre de la scolarité inclusive, l’utilisation de ces technologies dans une salle de classe revêt des enjeux symboliques et relationnels que tend à masquer l’approche du handicap par l’adaptation technique. On soulignera ainsi que l’inclusion et la participation sociale des personnes handicapées sont toujours, plus qu’une question de compensation technique, une affaire de choix politiques et institutionnels.
Données de santé à caractère personnel: Esculape vs Mercure ?
Authors: Lavenue Jean-Jacques
Published: June 2015

La mise en œuvre en France du SNIIRAM (Système National d’INFORMATION Interregime d’Assurance Maladie), relance le débat sur l’ouverture par l’Etat des données publiques au secteur privé et les risquesqu’elle implique. Dans le domaine des données de santé elle met en balance la recherche de rationalité qu’elle permettrait (dans les domaines de la recherche, prévention, marketing, sécurité médicale), et le risque d’exploitation mercantile des données sensibles et de la vie privée.
Fracture-Mechanical Parameters for Modeling of Quasi-Brittle Materials and Structures
Authors: Pukl Radomír , Sajdlová Tereza , Novák Drahomír , Lehký David
Published: June 2015

The scatter of experimental results using specimens made of quasi-brittle materials, such as concrete, fibre-reinforced concrete, ultra high performance concrete etc., can be due to their heterogeneity rather high. An assessment of fracture-mechanical parameters is then difficult and problematic. To remain at deterministic level is therefore unrealistic and without virtual statistical approach, simulation and probabilistic result assessment the consequent practical design of quasi-brittle material-based structures can be risky. A key parameter of nonlinear fracture mechanics modeling is fracture energy of concrete. Numerical simulation of concrete failure and fracture phenomena in concrete as well as other cementitious materials became a field of an intensive research in the recent years. With respect to accuracy and efficiency of corresponding numerical models some few still open questions have to be focused. How the heterogeneity of cementitious materials can be taken into consideration in the most realistic way using commercially available finite element programs A sophisticated option to get the parameters of the computational model indirectly is based on combination of fracture test with inverse analysis. This paper describes a methodology to get such parameters using experimental data from three-point bending tests used in inverse analysis based on combination of artificial neural networks and stochastic analysis.
Structural Design and Experimental Verification of Precast Columns from High Performance Concrete
Authors: Fiala Ctislav , Hejl Jaroslav , Tomalova Vladimira , Bilek Vlastimil , Pavlu Tereza , Vlach Tomáš , Volf Martin , Novotna Magdalena , Hájek Petr
Published: June 2015

Paper presents some results of long-term research of a new optimized subtle precast construction system based on high performance silicate composites. The system is particularly aimed for building construction in passive or zero-energy standard. Subtle structural elements from high performance concrete (HPC) can be integrated into building envelope of energy efficient buildings with significant reduction of envelope structure and avoiding risk of thermal bridges. Significant advantages of subtle elements are material and energy savings during production, transport, manipulation and construction on building site.Paper presents experimental verification of connection between columns and beams ensured by Peikko ́s PCs corbels. Moreover, production of two prototypes of high performance fibre reinforced columns over two floors is presented. Prototypes were casted in ŽPSV a.s. plant, Litice nad Orlicí in June 2014. Complex LCA analysis of three various reinforced concrete columns was performed. Analysis covers construction life phase. Consequently, environmental impacts of assessed variants were compared and evaluated. Results show that it is possible to reduce some impacts on the environment from 16 up to 65% in comparison with common solution of reinforced concrete columns due to the utilization of excellent mechanical properties of high performance concrete that enables the design of subtle structural elements.
Analytical and Statistical Evaluation of FRC Bending Tests Layouts
Authors: Podstawka Adam , Kovar Martin , Foglar Marek , Kristek Vladimir
Published: June 2015

Paper compares and discusses two different layouts of testing of mechanical and fracture properties of FRC, the three-point bending test and four-point bending test. The basis is extensive experimental program and analytical and statistical evaluation.
Experimental Research of Shrinkage in Thick Concrete Elements
Authors: Vitek Jan L. , Citek David , Tej Petr
Published: June 2015

At the construction of complex concrete structures of the laser centre, the client required verification of casting procedures on large scale models. Models of the thick floor slab and of the thick wall were built in the scale 1:1, where the temperatures induced by heat of hydration and shrinkage strains were measured. The results of the experiments showed that the measured strains were larger than those expected on the basis of prediction according to European codes. Experimental results were compared with the results of numerical analysis.
Analytical Description of Punching-Shear Resistance of Concrete Specimens Subjected to close Blast
Authors: Stohr Jiri , Foglar Marek
Published: June 2015

The paper describes approach for the description of punching-shear resistance of concrete slab specimens subjected to close blast. The procedure is based on a combination of standardized approaches, a rich experimental program and numerical modeling. The approach aims to quantify the close blast behavior in the means of the velocity of the loading, strain-rate dependent material characteristics and simplify it to allow practical use.
Testing the Long-Term Flexural Behaviour of FRC with Synthetic Fibres
Authors: Fladr Josef , Broukalova Iva
Published: June 2015

The paper describes a new methodology of investigation of long-term behaviour of fibre reinforced concrete (FRC) with of synthetic fibres. A set of tests was manufactured from FRC with synthetic fibres commonly used for production of FRC and referential set from SFRC (steel fibre reinforced concrete) and subjected to long-term loading. The testing is based on three-point flexural loading. In given time intervals deflections are measured and recorded. Results of investigations are presented and discussed.
Experimental Analysis of Reinforcement Corrosion on Bond Behaviour
Authors: Bilčík Juraj , Holly Ivan
Published: June 2015

The corrosion of reinforcement is the major cause of damage of reinforced concrete structures. This has an impact on safety, serviceability and durability of the structure. The corrosion of steel in concrete reduces the cross sectional area of the reinforcement and decreases the bond between reinforcement and concrete. Corrosion products have a higher volume than steel, which produces internal stresses that lead to the cracking and spalling of the concrete cover. The paper analyses the effect of the chloride-initiated corrosion of reinforcements on bond behaviour.
Fibre-Concrete Tubes in Pure Shear Mode
Authors: Kadlec Lukáš , Ráček Václav , Křístek Vladimír , Vítek Jan L.
Published: June 2015

Fibre-concrete is rapidly developing material, which becomes more widely often used. Strong feature of fibre-concrete is its ability of carrying stress after reaching the ultimate strength. In order to fully understand this material it is necessary to observe its performance in different types of failure. The aim was to create experiment in which the conditions of pure torsion are realized without accompanying by other stress. During testing there will be observed not only the ultimate strength, but also the torque-twist diagram and stress variation on the descending post-peak curve. Experiment of this new character will give results of great importance and will contribute to full understanding of performance of material fibre-concrete.
Monitoring the Degradation of UHPC Boards with Textiles Armatures
Authors: Kostelecká Michaela
Published: June 2015

In this article the degradation using hot water test is presented on thin UHPC slabs that are reinforced by a new type of armature. It is a textile armature. There were used the following types of textile armature: glass fibre mesh fabric, 2D glass fabric and 3D glass fabric. All textiles armatures were alkali-resistance. The degradation was carried out using the standard ČSN EN 12467. The specimens were divided into two sets. One set was the reference set and second set was carried the set exposed in hot water. The results were determined by comparing these two sets.
Precast Floor Plates from Lightweight Concrete
Authors: Hubertová Michala , Hladík Pavel
Published: June 2015

The paper deals with a system of precast floor plates from lightweight concrete intended mainly for building of family houses and residential construction. The developed system has two types of precast floor plates made from lightweight concrete: floor plates for floor systems and solid section floor plates. This paper describes solid section floor plates. The unambiguous advantage of lightweight concrete floor construction is weight lower by as much as 37% compared to floor structure made from common concrete, while bearing strength remains unchanged as well as high fire resistance. This type of floor slabs has also been successful in the system of assembled prefabricated houses thanks to its lower weight and elimination of the wet construction process.
Production and Properties of Functionally Graded UHPFRC Beams
Authors: Rydval Milan , Huňka Petr , Kolisko Jiří
Published: June 2015

Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) is a fine-gained composite material achieving both high compressive and tensile strengths. Values of compressive strength, tensile strength and bending strength depend not only on a composition of the mixture itself, but also on the border conditions of the setting of the test, it means the support type, the loading rate etc. UHPFRC is used not only in European countries (Germany, France, Holland), but in distant countries (USA, Japan, Australia), too. In the Czech Republic is UHPFRC produced mainly in laboratories. The first using of UHPFRC for the real construction in the Czech Republic was a production of lost shuttering slabs that were used at the reconstruction of the raod-bridge across R10 highway. These results of the lost shuttering slabs became the base of a more detailed research of the homogeneity of the steel fibre distribution and its impact on load bearing capacity of the UHPFRC elements. Experimental beams with a different volume fraction of steel fibres were made and tested on the basis of the determined results of a nonhomogeneous fibre distribution at the cross section of lost shuttering slabs. Then the layered beams with a controlled steel fibre distribution at the cross section were made and tested too. The test results together with a description and characterization of the behaviour of tested homogeneous beams with different volume fraction of the steel fibres and functionally layered beams are published in this paper.
High-Performance Concrete for Thin-Walled Members
Authors: Bily Petr , Fladr Josef , Kohoutková Alena , Broukalova Iva , Brejcha Vladimír
Published: June 2015

The new production method for mixing and placing of high-performance concrete for thin-walled members has been transferred from laboratory to manufacturing plant and applied on real-scale elements. Planar and spatial precast elements were produced. The new technology is applicable in both building and transportation structures (panels for horizontal and vertical load-bearing structures, bridge elements, leave-in-place formwork, foundation slabs, street furniture). The material used enables significant reduction of thickness of the elements. This leads to lower weight, easier transportation and handling on the construction site, which decreases transportation and assembling costs. Further savings are possible thanks to minimized number of reinforcement bars. High durability of structures is guaranteed by the use of high-performance concrete, leading to reduced life cycle costs.
The Effective Cross-Section Thickness and its Effect on Shrinkage
Authors: Hofírek Radovan , Zich Miloš
Published: June 2015

In concrete structures such as bridges or tanks, hydro insulation is applied several months after the actual construction of the structure itself. Concrete structures dry during part of their lifespan throughout the entire area of their structure. After hydro insulation is applied, drying is affected and it does not occur as it would under normal conditions. This change in drying conditions can eventually lead to changes in the structural behaviour of the structure e.g. bridges or tanks. Current computing programmes for time dependent analysis of the structure do not allow to take into consideration the above mentioned conditions while drying takes place, thus leading to static analysis inaccuracies [2]. The aim of this research is to experimentally demonstrate shrinkage as a result of the difference in drying of the concrete structural element ́s cross-section and their basic comparison with the calculations according to different standards.
Study of Properties of Concrete for Water-Tight Tunnel Lining
Authors: Hubáček Adam , Jarolím Tomáš , Macháňová Petra
Published: June 2015

The paper deals with the topic of concrete for water-tight tunnel lining. This theme is currently very topical both in the Czech Republic and abroad. The focus is on requirements and properties of fresh concrete for manufacture of these specific concrete structures. Properties of hardened concrete will be examined, too: compressive strength, resistance to pressure water, durability and other parameters.
Developing Fire Resistant Construction for Tunnel Construction Using Lightweight Aggregate Concrete
Authors: Junek Vladimír , Kolisko Jiří , Kroc Martin , Bradáčová Isabela
Published: June 2015

The article describes partial results of the research of fire and technical properties of lightweight concrete with regard to the possibility of the application of lightweight concrete in tunnel structure wall lining. The article summarises partial results of individual parts of the project focused on the specification of material properties, execution of temperature analysis of the fire resistance, calculation of structure heat transmission and specification of the thermal response of the material as subject-matter to the research.
Cable Stayed Bridge Avenida Prudente de Morais, Natal, Brazil
Authors: Novak Richard , Kocourek Petr
Published: June 2015

The paper deal with the design and construction of cable stayed bridge in the city Natal in Brazil. The bridge has total length of 280m and consists of two approaches and main cable-stayed part with spans of 2x60m. The cable-stayed part is formed by one pylon with two planes of stays. The superstructure of approaches is formed of precast beams and concrete composite deck. Parapet girder has been used for the superstructure design of cable stayed part. The pylon has a ”V” shape because of the plan curvature of the bridge. Strasky, Husty a partneri company has developed the detailed design of the bridge. The bridge construction has finished in June 2014.
Reconstruction of the Reinforced-Concrete Railway Bridge in km 3,668 – Argentinská of the Track Bubeneč – Holešovice in Prague
Authors: Sýkora Jan , Hacaperka Michal , Lukeš Jiří , Rosenthal Stanislav
Published: June 2015

This article provides a brief review of a reconstruction of the railway bridge in kilometer 3,668 of the railway-track Prague Bubeneč – Prague Holešovice. Specifically, the object is a 10-span reinforced-concrete slab bridge of spans app. 10x 20m carrying two railway-tracks. The reconstruction comprised of a superstructure waterproofing replacement, reconstruction or replacement of cornices and bridge seat at abutment O2 and replacement of all bearings and expansion joints.The bridge’s operation had to be maintained during reconstruction so replacement of bearings and expansion joints was carried out on an uplifted superstructure. Reconstruction of upper part (cornices, waterproofing and expansion joints) was conducted transversally by halves of bridge so operation was maintained at least on one of the railway-tracks.During the process, after consulted with SŽDC, some technical aspects of the original technical documentation from 2008 were changed according to an actual in-situ conditions and contractor demands. These changes involved a design of new cornices and a significant reduction in a number of temporary supports so the structures had to be analyzed for the temporary construction states again. After completing all works on bridge deck and enabling operation of both tracks, the bridge reconstruction continued with reconstruction of the superstructure’s bottom face and existing parts of substructure including building-up of new pile caps.
Concrete Pavements on Bridges
Authors: Slansky Bohuslav , Šrůtka Jiří
Published: June 2015

When traffic intensity on motorways exceeds more than 10 thousands heavy vehicles per day, it is clear that the concrete pavement is the most durable solution. But on bridges and adjacent areas it is usually used asphalt pavement. Recent research shows that the change in surface skid resistance increases a risk of traffic accident in these areas. The goal of this research project describes the continuous concrete pavement also on bridges and its behavior.
Effects of Creep and Shrinkage on an Integrated Arch Structure
Authors: Slansky Bohuslav , Necas Radim , Strasky Jiří
Published: June 2015

Arch footbridges are one of the fields that authors of this paper deal with. Amid the studied variants were also structures with lower deck suspended on two arches of various geometric arrangements. The analysis was, among others, focused on the advantage of the application of non-rigid segmental deck with respect to final behaviour and rheological effects. These effects were considered both on case studies and real structure in Salem, Oregon, currently being erected.
Experimental Verification of Plan Curved Arch Structures
Authors: Hochman Dominik , Trenz Jan , Nečas Radim , Strasky Jiří
Published: June 2015

This paper describes preparation and implementation of a model test of two space arch pedestrian bridges that are currently being developed. Implementation of a static model built in the scale 1:10 follows from the design of studied structures.
Plate-Element Numerical Model of a Bridge across the Hostovsky Creek
Authors: Slansky Bohuslav , Zich Miloš
Published: June 2015

The bridge across the Hostovsky creek, on the expressway R1 on Slovakia was open to public traffic at autumn 2011. The bridge itself is measured since the time of erection. The authors of the presented paper are now preparing a new plate-element model, which shall contribute to the better prediction of the long-time behaviour. In this paper, the new model is presented and compared with the measurements from the static test of the bridge.
Punching Resistance of Flat Slabs without Shear Reinforcement
Authors: Hanzel Ján , Majtánová Lucia , Halvonik Jaroslav
Published: June 2015

RC flat slabs are frequently used structural members in building construction. Safety verification and avoidance of failure due to punching in the vicinity of a column is currently performed using empirical model which is introduced in Eurocode 2. However extensive discussions are held about replacement of the EC2 model by more refined mechanical model which is presented in Model Code 2010. The paper deals with statistical evaluation of the safety level above mentioned models for punching resistance without shear reinforcement. Evaluation is supplemented by third model from already cancelled Czechoslovak national standard ČSN 731201. Database which includes results of more than 400 experimental tests of flat slab specimens has been used for the statistical evaluation.
Calculation of the Minimum Reinforcement for Limitation of Crack Width According to Change of National Annex for ČSN EN 1992-1-1
Authors: Šmejkal Jiří , Procházka Jaroslav
Published: June 2015

Design of minimum reinforcement for concrete elements with regard to width of cracks is important for consumptions of steel. Optimal amount of reinforcement shall ensure that cracks, which are typical for reinforced concrete structures, will be small that the serviceability and durability will be not influenced. One of most important parameter for crack width is the maximum distance between cracks. The information connecting with various procedures for design and minimum reinforcement with regard to width of cracks are given in this article.
Overall Reliability of the Concrete Columns in Case of Stability Loss
Authors: Benko Vladimír , Kendický Peter , Krizma Martin , Kišac Marian , Beleš Ivan
Published: June 2015

The European standard EN1992-1-1 shows a significant lack of an overall reliability in cases when loss of stability of concrete columns precedes reaching of resistance in a critical cross-section. The columns, subjected to axial force and bending moment, experimentally tested in the laboratory of Faculty of Civil Engineering SUT in Bratislava, were designed so that the loss of stability occurs at the concrete strain about 1.5 ‰ on the compressed edge of a critical cross-section.
Punching Analysis of a Flat Slab with a Change in Elevation
Authors: Nováček Jan , Zich Miloš
Published: June 2015

In recent years, construction of buildings with concrete flat slabs has developed widely. For these structures, correct punching design is crucial. Suitable punching check methods for most common details are provided in all standards. In some cases, however, it is necessary to use a detail that is not fully covered in effective codes. In the article, the change in elevation at a column line detail of a flat slab is analysed. Attention is paid to possible ways of inner forces interpretation and to their subsequent check in accordance with standards. Several linear models and one nonlinear model were created and compared against each other.
Possible Synergism of High Temperature Fly Ash and Fluidized Bed Combustion Fly Ash in Cement Composites
Authors: Orsakova Denisa , Hela Rudolf , Novosad Petr , Valek Jaroslav
Published: June 2015

One of the possibilities how to activate fly ash in cement composites is to add calcium oxide as a chemical activator. This addition can improve pH of composites. Because fluidized bed combustion (FBC) fly ash contain around 15% of calcium oxide, we decided to add FBC fly ash into binder system of cement composite with classic fly ash.Three mixtures were designed. First one contain in binder system only cement and classic fly ash. In second and third mixture was part (25% resp. 50%) of classic fly ash replaced by FBC fly ash. Consistency, shrinkage, compressive strength and freeze-thaw resistance were tested. Microstructure was detected by XRD and TG analyses.
Laser Centre ELI, Dolni Brezany
Authors: Koukal Jiří , Kostkova Ludmila , Mazurova Milada , Vitek Jan L.
Published: June 2015

The ELI (Extreme Light Infrastructure) Laser Centre building is a relatively complex object, which has to meet a number of unusual requirements arising from its function. A reinforced concrete structure of the laser hall is one of the most complex parts of the Centre. The structure not only fulfils its static function – withstanding the static load, but it must also minimize any incidental vibrations and shield radiation generated during operation of the laser. Structural and material solution of the structure must match these requirements.
Effect of Lightweight Concrete Density on Bond Strength
Authors: Kadlec Jaroslav , Terzijski Ivailo , Girgle Frantisek , Zvolánek Lukáš
Published: June 2015

The main objective of this paper is connected with the search of an optimal anchorage length of reinforcement in lightweight and ultra-lightweight concretes. Experimentally obtained values of the bond stress between lightweight concrete and reinforcing bars are presented. The density classes of lightweight concrete were D1,0, D1,2 and D1,4. The results are compared with equal ones of normal density concrete. The tests with ordinary reinforcement and with non-metallic hybrid reinforcement C-GFPR (30% portion of carbon fibres) were conducted.
Measurement of Set Fibre-Concrete Homogeneity in Finished Steel Fibre-Concrete Structure of Segmental Tunnel Lining
Authors: Hobst Leonard , Vodicka Jan , Bílek Petr , Vala Jiří
Published: June 2015

A new test method of set fibre concrete homogeneity in finished steel fibre-concrete structure is described in this contribution. The method is based on measurements of the changes in magnetic field strength of permanent magnets which are induced by a change of wire distribution in steel fibre-concrete structure. It is evident from the method described in this contribution that the test is characterized as a local failure test using small diameter core drill. It is a semi-destructive method. Its application in practice does not affect safety and reliability of steel fibre-concrete structures.Additionally to the method described, an example of its application for the assessment of fibre concrete homogeneity of the segmental tunnel lining parts is described. The results of partial measurements give both information about fibre concrete homogeneity in a segment and a number and a selection of points for homogeneity measurements which are subject to the size and the production method of such segment.
Influence of Recycled Aggregate Quality on Recycled Concrete
Authors: Šefflová Magdaléna , Pavlů Tereza
Published: June 2015

This article deals with the influence of recycled aggregate quality on recycled concrete. Replacement of natural aggregate by recycling aggregate has a negative influence on the properties of concrete. Three types of recycled aggregate were used for the production of concrete. The samples of recycled aggregate were obtained from two recycling plants in the Czech Republic. The samples of recycled aggregate were tested by pycnometric method. From the test results, a different quality of recycled aggregate was discovered. For the testing of concrete, a total of eight concrete mixtures were made, one of which was a reference mixture and the natural aggregate was replaced by recycled aggregate of varying ratio in the other mixtures. Finally, it is possible to say that use of recycled aggregate in concrete influences the properties of concrete. This influence depends on the quality and amount of recycled aggregate in the concrete.
Options for Improving the Workability of High Performance Concrete
Authors: Ženíšek Michal , Vlach Tomáš , Laiblová Lenka
Published: June 2015

A low water-cement ratio is one of the main characteristics of high performance concrete thanks to high strength of concrete is achieved. However, it leads to deterioration of the rheological properties and therefore it is necessary to use a plasticizing admixtures. Other options to influence workability are introduced in this article. There is studied the correct selection of cement, the temperature of water, the particle size distribution of aggregates (packing density) and the use of ground granulated blast furnace slag (GGBS). The performed experiments show a greater or lesser influence all studied options on the workability. Therefore this options is appropriate to keep in mind during mix design of high performance concrete.
Influence of Ground Clay Brick on the Properties of Fresh and Hardened Self Compacting Lightweight Concrete (SCLC)
Authors: Juradin Sandra , Grbeša Katarina
Published: June 2015

This paper aims to investigate influence of ground cay brick as filler or as aggregate on the workability and compressive strength of self-compacting lightweight concrete. Ground red brick was combined with other additives like: silica fume, stone powder and filler which was obtained by recycling old concrete. For this purpose, several mixtures of self-compacting concrete were prepared and tested. Properties of fresh mixture were determined by slump flow method, visual assessment of stability, T50 time, V-funnel method, L-box method and J-ring method. Also, in hardened state, compressive strengths and dynamic modulus of elasticity after 7 and after 28 days were determined.
Environmental Assessment of Recycled Aggregate
Authors: Pavlů Tereza , Kočí Vladimír , Šefflová Magdaléna
Published: June 2015

The paper presents an environmental assessment of construction and demolition (C&D) waste production. The use of C&D waste carries a number of positive and negative aspects. These aspects should be compared to find the optimal way for recycled aggregate use. This study presents results of a fuel consumption survey of Czech recycling companies. Furthermore, there are evaluated impact categories of the connection with the diesel production and diesel burning during recycling process. Finally, it is shown comparison with database data for mining of natural aggregate. In addition, the results of previous investigation of the impact of natural aggregate substitution by recycled aggregate in concrete mixtures on mechanical and deformation properties of recycled concrete are presented.
Influence of the Amount of Dispersed Suspension of Carbon Nano-Tubes on Physico-Mechanical Properties of Cement Mortar
Authors: Jarolím Tomáš , Hela Rudolf , Labaj Martin
Published: June 2015

Nanotechnology has become a driving power in most of the branches of industry recently and construction industry is not an exception. Therefore, this paper deals with the topical problem of using nanoparticles in concrete. Carbon nanotubes (CNTs) with exceptional physico-mechanical properties were used in the experimental part of the paper. Their potential for enhancing characteristics of common concrete is promising. A frequent problem of application of carbon nanotubes is their agglomeration, which is caused by high surface tension, Van der Waals force and high ratio of sides. This fact limits possibilities of application of CNTs and it is the main reason of rare use of the promising potential of CNTs. Formed agglomerations can be dispersed by adding energy from outside and if suitable surface active agent in the solution of CNTs and water is added, their re-agglomeration can be prevented. Experimental part of the paper focuses on possibilities of dispersing CNTs by means of ultrasonic homogenizer Bandelin Sonopulse HD 3200 and suitable surface-active substance. Tests specimens were prepared from a suspension of water and CNTs with two different proportions and development of physico-mechanical properties in time was observed. Results confirmed the trends described in foreign literature sources and gave valuable impulses for further attempts to use nanotechnology in concrete technology.
Edit the Properties of the Fresh Concrete Admixing Additives and Steel Fibres
Authors: Suchánek Vladimír , Slováček Matěj
Published: June 2015

This article describes experimental work carried out by the Department of Transport Structures of Jan Perner Transport Faculty, University of Pardubice in the laboratory facilities of the Training and Research Centre in Transport.This is an effective change of properties by admixing the additional air-entraining agents, or steel fibers, or combinations thereof to the delivered batches.The final chapter summarizes the laboratory results, including the effect of air content on the physico-mechanical characteristics and durability of concrete.
Possibilities of Nanoparticle Application in Concrete Technology
Authors: Hela Rudolf , Labaj Martin
Published: June 2015

In the SI unit system the prefix nanomeans one billionth, therefore 10-9. We can meet nanometers, the size units, more frequently than nanowatts or nanopascals. The study and handling with substance structures in nanometer scale, therefore on atomic and molecular levels are generally known as nanotechnology. Thanks to "natural“ nanotechnology – compilation of material atom after atom and molecule after molecule, new materials with extremely convenient properties are created like for instance mollusk shells or spider silk which the humanity has not been able to artificially produce so far. [1] Nevertheless this can be changed soon.
Measuring the Deflection of Reinforced Concrete Slab
Authors: Páleník Branislav , Stará Anna , Kratochvíl Richard , Zich Miloš
Published: June 2015

A significant limiting factor for the design of reinforced concrete ceiling slabs is the assessment of the limit state of deflections limit. There could be more methods of calculating deflections, but it is necessary to confront them with the reality on the construction. In this article the measurements of the deflection of reinforced concrete slabs are stated, which are then assumed to be compared with different calculation ways. For the measurement the slab was selected, which is located in a multifunctional building in Brno in Houbalova Street. The measurement was carried out by a precise levelling method.
Optimization of Pretensioned Steel Fiber Reinforced Concrete Beam
Authors: Novák Josef , Kohoutková Alena
Published: June 2015

Pretensioned concrete beams are used as a main load bearing member for composite bridges with a span to 30 m. The advantage of longitudinal prefabrication technology of beams for small span bridges is quick installation, savings of straight supporting scaffolding of centers and formwork. The amount of labour with formwork, reinforcement and concrete including work with scaffolding of centers on site is reduced at a minimum. During searching applications of steel fiber reinforced concrete (SFRC) suitable for this kind of structure a pretensioned concrete beam suitable for a bridge bay with a span from 12 to 15 m has been chosen for an investigation. Three types of beam were manufactured for experimental tests. The beams were supposed to be a part of a bridge bay with a composite slab. These pretensioned beams were made of SFRC. In case of the experimental tests, a cast-in place concrete cover from plain concrete was casted on the top of the beams. The cast-in place concrete cover simulated a top composite slab. The bearing capacity of the beams with the cast-in place concrete cover was tested until their destruction. The tested beams showed higher bearing capacity than it was determined by a theoretical calculation. The beams also demonstrated high safety against collapse during structure overloading. The process of the experimental testing was also simulated on a numerical nonlinear model and then the results were compared. The result comparison of the both types of tests did not show any significant irregularities.
Progressive Mobility As a Team Effort in Transitional Care
Authors: Ecklund Margaret M. , Bloss Jill W.
Published: June 2015

With changing health care, progressive care nurses are working in diverse practice settings to meet patient care needs. Progressive care is practiced along the continuum from the intensive care unit to home. The benefits of early progressive mobility are examined with a focus on the interdisciplinary collaboration for care in a transitional care program of a skilled nursing facility. The program’s goals are improved functional status, self-care management, and home discharge with reduced risk for hospital readmission. The core culture of the program is interdisciplinary collaboration and team partnership for care of patients and their families.
Posttraumatic Stress Syndrome Associated With Stays in the Intensive Care Unit: Importance of Nurses’ Involvement
Authors: Warlan Heather , Howland Lois
Published: June 2015

More patients in the intensive care unit are surviving their critical illnesses because of advances in medical care. This change in survival has led to an increased awareness of the emotional consequences of being critically ill. Posttraumatic stress disorder has been identified in approximately 9% to 27% of critically ill patients compared with 7% of the general US population. Risk factors such as treatment with mechanical ventilation, sedation, delusional memories, and agitation are associated with development of posttraumatic stress disorder in patients in the intensive care unit. Individuals with posttraumatic stress disorder are more likely to experience negative physical and psychiatric health outcomes and a lower quality of life than are patients without the disorder. Early identification and treatment of patients experiencing these signs and symptoms may reduce these physical and psychological comorbid conditions. Through careful monitoring of medications, early mobilization, sleep promotion, and pain management, nurses may be able to reduce signs and symptoms of posttraumatic stress disorder.
Pain, Agitation, and Delirium Guidelines: Nurses’ Involvement in Development and Implementation
Authors: Davidson Judy E. , Winkelman Chris , Gélinas Céline , Dermenchyan Anna
Published: June 2015

The 2013 American College of Critical Care Medicine/Society of Critical Care Medicine clinical practice guidelines for the management of pain, agitation, and delirium in adult patients in the intensive care unit serves as a living example of nurses’ involvement in the development and implementation of professional guidelines. Nurses who served on this guideline-writing panel describe their experiences. Specific examples from the pain, agitation, and delirium guidelines for care are used to explore the roles of the nurse leader, nurse informaticist, staff nurse, and nurse researcher in relationship to guideline implementation.
Hiring Appropriate Providers for Different Populations: Acute Care Nurse Practitioners
Authors: Haut Cathy , Madden Maureen
Published: June 2015

Acute care nurse practitioners, prepared as providers for a variety of populations of patients, continue to make substantial contributions to health care. Evidence indicates shorter stays, higher satisfaction among patients, increased work efficiency, and higher quality outcomes when acute care nurse practitioners are part of unit- or service-based provider teams. The Consensus Model for APRN Regulation: Licensure, Accreditation, Certification, and Education outlines detailed guidelines for matching nurse practitioners’ education with certification and practice by using a population-focused algorithm. Despite national support for the model, nurse practitioners and employers continue to struggle with finding the right fit. Nurse practitioners often use their interest and previous nursing experience to apply for an available position, and hospitals may not understand preparation or regulations related to matching the appropriate provider to the work environment. Evidence and regulatory guidelines indicate appropriate providers for population-focused positions. This article presents history and recommendations for hiring acute care nurse practitioners as providers for different populations of patients.
Vulnerability of Older Patients in Critical Care
Authors: Hardin Sonya R.
Published: June 2015

One of the patient characteristics in the AACN Synergy Model is vulnerability. Vulnerability is defined in the model as the susceptibility to actual or potential stressors that may adversely affect patients’ outcomes. The risk of vulnerability increases in older patients in critical care units.
Financial Liberalization – ‘The Correct Sequence’: A Sri Lankan Experience
Authors: Patabendige S. S. J. , Senarath S. A. C. L.
Published: May 2015

Financial repression that existed for a period of two decades prior to the 1977 economic reforms led to a reduction of the economic growth to the lowest possible level that Sri Lanka has ever experienced. This dismal performance of the economy, which could be witnessed by 1977, paved the way for introducing a set of far reaching economic reforms including financial reforms (financial liberalization). The financial liberalization that was followed starting from 1977, were mainly based on the McKinnon-Show hypothesis, calling for more liberal financial sector reforms which should precede economic development. Empirical Studies done in the late 1980s and 1990s with financial liberalization experience in the world as well as in Sri Lanka lent support to the McKinnon-Shaw hypothesis. But, the later evidence shows no clear relationship between financial liberalization and the achievement of desired outcomes in recent years, thus the current literature is more to identifying and explaining the reasons for non-achievement of the objectives of financial liberalization. The main factor that has been identified by majority of recent research for eroding the outcomes of financial liberalization is the incorrect policies being followed in implementing financial liberalization (sequential problem). Therefore this study attempts to empirically test whether financial liberalization undertaken in Sri Lanka has followed the correct sequence of policies for financial liberalization or not. The hypothesis is tested, by constructing three financial liberalization indices for the three sequences (viz., real sector liberalization should precede domestic financial sector liberalization and that domestic sector financial liberalization should precede the external sector liberalization.) identified as most desirable to make financial liberalization a success. Finally it was found that, last sequence has been implemented at a fast pace than that of its desired sequential predecessors during the initial years of financial liberalization in Sri Lanka. Even after the initial period the real sector liberalization, which is seen as the stabilizing force under financial liberalization process has not been reformed adequately.The Kelaniya Journal of Management, Vol. 3(2); 2014: 1-27
Post Succession Performance of Medium Size Family Owned Business in Sri Lanka
Authors: Alwis A.C. De
Published: May 2015

Post succession performance of family owned businesses has become ineffective. Literature specifies that inter-generational succession is the prime cause for succession failures. In this setting, current family owned businesses focus attention on finding alternative, profitable succession modes. The foremost purpose of this research was to compare performances of family and non-family successors. The target population was selected were the successors of family owned businesses. The criteria to select the population were the family owned businesses that contain between 50 and 149 employees and who were involved in a business succession process within the last 10 years excluding the three years, 2007 to 2010. Sample units were selected through simple random sampling method and consist of 128 units. The main data collection modes were a structured research questionnaire mail-out, and also in-depth discussions held with successors. According to study findings, not all successors were satisfied with the business succession process. Unrelated manager successors have higher satisfaction then the family member successors, but neither group exceeds the moderate level. This study found that if successors were not satisfied with the business succession process, it badly affected their following business performance. All successors lowered business performance efficiency and recorded worse performance than the incumbent. However unrelated manager successors recorded better results than the family member successor in both categories. Therefore, if family members are not available or prepared for business succession, unrelated manager are a good alternative.The Kelaniya Journal of Management, Vol. 3(2); 2014: 28-67