cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.12755/isec.res.2014.106
title: WIND LOADS AND WIND-INDUCED BUCKLING OF OPEN-TOPPED OIL-STORAGE TANKS IN VARIOUS ARRANGEMENTS

description: Wind force coefficients for designing open-topped oil-storage tanks in various arrangements have been investigated under experiments involving a wind tunnel and a buckling analysis of the tanks. In the wind tunnel experiment, the wind pressures were measured simultaneously at many points both on the external and internal surfaces of a rigid model for various arrangements of two to four tanks. The effects of arrangement and gap spacing of tanks on the pressure distribution are investigated. The buckling of tanks under static wind loading is analyzed by using a non-linear finite element method. A discussion of the effect of wind force distribution on the buckling behavior follows. The authors provided a model of circumferential distribution of wind force coefficient on isolated open-topped tanks in their previous paper. This paper proposes a model of wind-force coefficient for plural tanks in various configurations by modifying the model for isolated tanks.
DOI: 10.12755/isec.res.2014.107
title: USING NANOFIBERS IN THE RESTORATION OF HISTORIC COATINGS ? RESISTANCE TO SALT CRYSTALLIZATION

description: The paper presents partial results of research into the application of nanofibers in the stabilization, conservation, and strengthening of historic plasters. Nanotechnologies applied in all basic technical disciplines currently belong to the most popular fields of research. The restoration of historic and cultural heritage buildings must not in any way damage the preserved original coatings. The execution method and the choice of the suitability of used materials must respect the preserved condition based on the original plaster composition. The research addresses the above issues by applying nanofibers to textile carrier fabrics. The suitability of selected electrospun polymers and acrylates for the purposes of strengthening surface layers, and the application methods of nanotextiles on plasters, were investigated. The objective of this study is to verify whether the newly-designed methodology for the stabilization, conservation, and strengthening of historic plasters meets structural and technical demands, as well as the strict criteria set by cultural heritage conservation.
DOI: 10.12755/isec.res.2014.108
title: INFLUENCE OF NANOSILICA AND MICROSILICAON PROPERTIES OF CONCRETE

description: In this study, supplementary cementing materials (SCM), such as nanosilica and microsilica, have been evaluated for optimal levels of replacement as a blending material in cement. The physical and chemical properties of these materials were first analyzed, then the properties of neat samples, mortar samples, and concrete samples were investigated. Mainly this study focused on the workability and compressive strength with different mixes at different ages of neat, mortar and concrete mixes. Test results obtained in this study indicate that up to 5% nanosilica and 10% of microsilica could be advantageously blended with cement without adversely affecting the strength. However, optimum levels of these materials are 1-3% of nanosilica and 3-8% of microsilica when we consider the strength of concrete.
DOI: 10.12755/isec.res.2014.109
title: FLY ASH AND BAGASSE FIBER INFLUENCES ONMECHANICAL PROPERTIES OF GREEN HYBRIDFIBER-REINFORCED CEMENTITIOUSCOMPOSITES

description: In this paper, a new green fiber-reinforced cementitious composite containing high volume fly ash and hybrid steel and bagasse fibers is developed. Eco-friendly bagasse fibers from industrial waste and steel fibers are used to improve the mechanical behavior of the new composite, and high-volume fly ash is used to decrease the usage of cement in order to be more environmentally friendly. The influence of the fiber content and fly ash/cement ratio on the mechanical properties of the composite is investigated through the study of the mechanical properties of the new composite, such as compressive strength, modulus of elasticity, and modulus of rupture. It is found that compressive strength, Young's modulus of the composite, decreases with the increase of the fly ash/cement ratio and bagasse fiber content. However, the modulus of rupture of the composite increases firstly with bagasse fiber content, and decreases when bagasse fiber content reaches 3% by volume.
DOI: 10.12755/isec.res.2014.110
title: EVALUATION OF SHRINKAGE AND DURABILITYOF GEOPOLYMER CONCRETE USING F-CLASSCOAL ASHES

description: This paper evaluates the strength, shrinkage and durability characteristics of concrete using 100% fly ash and bottom ash as binder. It is seen that the compressive strength of activated fly ash and bottom ash concrete reaches respectively 25 MPa and 30 MPa, and that the change in strength is insignificant as per the content of bottom ash powder. Moreover, the total amount of shrinkage of the activated bottom ash concrete appears to be larger than that of the activated fly ash concrete. In addition, the drying shrinkage and durable performance of the activated ash geopolymer concrete is verified to be superior to that of ordinary cement concrete.
DOI: 10.12755/isec.res.2014.111
title: THE EFFECT OF FIBER DISPERSION ONSTRENGTH PROPERTIES OF FIBER-REINFORCED CEMENT COMPOSITES WITHMWCNT

description: This experimental study was intended to improve the strength properties of Multi-walled Carbon Nano-tubes (MWCNT) reinforced cementitious composites. CNT is a very promising construction material with excellent mechanical properties. However, the strong van der Waals force between their particles hinders their dispersion, limiting strength development. Therefore, homogeneous dispersion is required to obtain enhanced strength of composites by incorporating MWCNT. With this purpose, the variables considered in this study are the level of sonication, the amount of surfactant, the replacement ratio of silica fume, etc. Studies through an optical microscope indicated that the fiber dispersion of CNT was improved with the increase of sonication period, and that compressive strength was enhanced as the degree of sonication increased. When superplasticizer as a surfactant had a SP/CNT ratio of 4?6, the best improvement in strength was obtained. Silica fume was shown to produce the highest compressive strength at 10% replacement.
DOI: 10.12755/isec.res.2014.112
title: HYSTERESIS AND TEMPERATUREDEPENDENCY OF WATER VAPOR SORPTION

description: Moisture in porous building materials plays an important role in almost all durability problems. The sorption characteristics of building materials exhibit hysteresis in the way the equilibrium curves develop between adsorption and desorption. The sorption curves are also somewhat temperature-dependent. These facts are most often neglected in models for combined heat and moisture transport in materials. This study provides the sorption isotherm and its hysteresis of different porous building materials. The paper seeks to contribute to the knowledge base about such sorption characteristic by presenting some new measurements of hysteresis and temperature dependency of the moisture sorption characteristics of different porous building materials: concrete, porous concrete, cement plaster, limes cement plaster, brick, and spruce. Scanning curves are measured for all materials where periods with adsorption and desorption interrupt each other intermittently between 0% and 97% of relative humidity.
DOI: 10.12755/isec.res.2014.113
title: DEVELOPMENT OF ASPHALT BINDERPERFORMANCE GRADES

description: Asphalt plays a significant role in a pavement?s ability to withstand thermal and fatigue cracking that contributes to permanent deformation behavior. Temperature is a significant factor that affects asphalt binder and thus the performance and life span of the whole pavement. This paper presents research developing asphalt binder performance grade requirements, according to Superpave, suitable for different climatic conditions all over Egypt. Twenty one weather stations covering Egypt were selected, then after analysis their air temperature data was converted to pavement temperatures using LTPP and performance models. Finally, the converted pavement data were used to propose asphalt binder performance grades (PG) for the various regions of Egypt. The proposed grades range from PG52-10 to PG76-10 depending on the location, the applied model, and the degree of project reliability.
DOI: 10.12755/isec.res.2014.114
title: EFFECT OF CHANGE IN MIX PROPORTIONS ONSOME PROPERTIES OF CONCRETE CONTAININGATTAPULGITE MINERAL ADMIXTURE

description: This project investigated the effect of high reactivity Iraqi High-Reactivity Attapulgite (HRA) on some properties of concrete (e.g., compressive strength, splitting tensile strength and flexural strength) when mixing proportions were changed. Three mixes of concrete were made (1: 1.69: 2.13), (1: 1.13:1.68) and (1: 0.89: 1.96), with (water/cement) ratios (0.48, 0.41 and 0.32), for 35, 45 and 60 N/mm2 target compressive strength respectively. The percentage increase in the compressive strength at 28 days were 48.29%, 49.64% and 42%, respectively, compared with compressive strength for the same mix at 7 days. In addition, the increase in splitting tensile strength at 28 days was 45.27%, 31% and 30%, and in flexural strength at 28 days was 30%, 52.47% and 26.18%, for the above mixes respectively, compared with strength for the same mix at 7 days.
DOI: 10.12755/isec.res.2014.115
title: BOND STRENGTH OF STEEL-CONCRETECOMPOSITE ELEMENTS USING ACEMENTITIOUS ADHESIVE

description: Steel-concrete composite slabs have been used for bridge deck construction in Japan because of several advantages, e.g., safety construction and high fatigue durability. On the other hand, these slabs may cause negative influences such as overweight, increasing costs and low constructability, due to many mechanical shear connectors. The quantities of shear connectors may be reduced by gluing steel-plate and concrete with a cementitious adhesive. The present study aims at examining shear bond strength and quantifying the dispersion of the strength. To investigate the dispersion, a double-lap shear test is conducted, in addition to a simple direct shear test, to examine surface treatment. A Monte Carlo Simulation using the Weibull distribution of the strength is performed to evaluate the effect of dispersion. The simulation implies that the shear stress due to the traffic load may be negligible, indicating the applicability of the composite system for highway bridge decks.
DOI: 10.12755/isec.res.2014.116
title: INFLUENCE OF CURING CONDITIONS ANDALKALI HYDROXIDE ON STRENGTH OF FLYASH GEOPOLYMER CONCRETE

description: Geopolymer concrete is known as an alternative to Portland cement, with low carbon dioxide emissions compared with the conventional building materials. In this research, the influence of curing conditions and alkali hydroxide were investigated, using curing temperatures between 40 to 100?, curing times from 4 to 12 hours, and various types of hydroxide and concentrations of sodium hydroxide solution. Geopolymerization needs energy and time to occur, and higher curing temperatures resulted in larger compressive strength, while longer curing times resulted in higher compressive strength. At the same curing temperature, longer curing time resulted in a higher compressive strength because the longer curing time extends the chemical reaction. For geopolymer concrete, sodium hydroxide is a better property than potassium hydroxide, because the atomic size of sodium anion is smaller than potassium. Further, the strength of concrete increased when the concentration of sodium hydroxide increased. In conclusion, geopolymer concrete is suitable for traditional building materials. Finding renewable materials to satisfy the increasing demand for building structures will be the primary challenge in future.
DOI: 10.12755/isec.res.2014.117
title: CAUSES AND EFFECTS OF VARIATIONS ON CONSTRUCTION PROJECTS

description: Because of their bespoke nature, construction projects are susceptible to variations irrespective of type, size and complexity. The effects of these variations are significant and may include cost and time overrun, productivity, and waste issues at the minimum. Although variations have been widely researched, investigations into the relationship between the significant causes of variations and their effects have not. This study also considers control measures that could minimize variations in residential building projects, where significant variations are happening in the Sri Lankan construction industry. A questionnaire survey was administered to study participants with the objective of identifying significant causes and effects of variations on residential building projects. The participants were professionals across industry groups such as clients, consultants, and contractors who deal with variations on Sri Lankan construction projects. The study found that change in designs or project scope by owners or design consultants were due to owners? financial problems, errors and omissions in design, conflicts between contract documents, inadequate working drawing details, lack of coordination by consultants, differing site conditions for contractors, unforeseen problems and weather conditions. Cost and time overruns are subsequent effects of those variations. The study suggests that variations could be minimized by adopting control measures that are appropriate for both the design and construction stage.
DOI: 10.12755/isec.res.2014.118
title: A NEW METHODOLOGY FOR ADDRESSING CLIENT RISKS IN CONSTRUCTION PROJECTS

description: Delay-risk factors associated with clients in a construction project have a major impact on a successful delivery on time and within budgeted cost. Risk management studies so far have not effectively managed project risk factors in a way that can assist clients in creating strategies to reduce impacts and risk. To address these issues, the study aims to provide a new methodology for analyzing and managing the risks by building a conceptual model. The study includes the development of a framework, named the client risk management model (CRMM), by integrating the findings from a literature review and a construction industry survey. A client risk analysis system was developed by integrating the analytical hierarchy process and a Monte Carlo simulation within an @Risk program. A case study demonstrated the methodology to analyze and quantify the impact of risk factors, and to create a suitable risk mitigation strategy at the design stage of a construction project. The system was found to be useful for quantifying the impact of client risks and the support in taking proactive decisions.
DOI: 10.12755/isec.res.2014.119
title: RISK ASSESSMENT THROUGH CONSTRUCTION SEQUENCE ANALYSIS FOR PLANT CONSTRUCTION PROJECTS

description: Although South Korean construction companies have significantly increased their share in the international construction market, the work scope of their projects has been limited to detail design and construction, instead of expanding their market to the earlier phases of project execution. South Korean companies should also expand their capabilities to project management consultancy (PMC), enabling planning and scheduling knowledge to handle various risks associated with each work package. This research involved developing a Unit Activity Sequence Model (USAM) for industrial plant construction projects to minimize project risks. A Standard Sequence Logic Unit was set up to establish the initial scheduling phase of plant projects, and to understand objectively construction flows and the association between construction events, etc. Previous research has a scope that is very limited to specific plants, and it is currently unsatisfactory to understand the flow of overall plant construction. This research is different from other studies busing USAM per work package in the initial planning process, in order to help determine the overall flow. It is based on various references and extensive opinions collected from the schedule management experts as a reason for the lack of case studies. Thus, more research and process-related data collection needs to be added from the experts in various research companies.
DOI: 10.12755/isec.res.2014.120
title: AN EXPLORATORY EVALUATION OF A NEW RISK-BASED INSPECTION SCHEME

description: Government passes laws both through statute and regulation to protect people. The Building Act is one of such government regulation that obligatorily requires buildings be designed and constructed for safety, health, development, and the safeguarding of people from possible injury. In 2010, the New Zealand Government proposed a new control regime to streamline building proposal approval by introducing risk-based inspections, where inspection were circumvented in terms of risk for certain types of building works. Risk-based inspection is generally seen as accelerating the process of building approvals, therefore allowing contractors to manage their project time without a bottleneck of regulatory inspections. The study offers a preliminary evaluation of the effectiveness of this newly-introduced building inspection scheme. The larger study programme on which this paper is based gathered the perceptions of building control practitioners. Data was also collected through a questionnaire survey to homeowners/agents of completed homes. This could improve the institution of this new scheme. This paper puts this larger study into perspective for the New Zealand construction industry and academia. It finds that risk-based building inspections will likely accelerate the building process, but can only flourish if licenced building practitioners provide a quality product and stand by their work.
DOI: 10.12755/isec.res.2014.121
title: RISKS IN DEPLOYING MOBILE TELECOM SITES

description: The telecom industry is one of the fastest-growing industries worldwide. Such development has created new activities that overlap with other industries, e.g., construction. This paper investigates the risks in mobile telecom projects in Egypt, where the authors work or have previously worked, and how they differ as per the prime project?s type and characteristics. While most telecom sites have a similar construction sequence, i.e., from site acquisition to broadcasting the services, they still differ in their characteristics. Following an extensive literature review and interviews with various stakeholders in the telecom site deployment process, four project types were identified. Each was recognized to have special characteristics that influence the risks that could arise in this particular type. Questionnaire surveys were prepared and disseminated to examine the risks in the four types and the severity recognized in each. A comparison is made to identify the similarities and differences. A critical discussion follows to clarify the results.
DOI: 10.12755/isec.res.2014.122
title: TYPES, CAUSES, AND EFFECTS OF DEFECTIVE CONSTRUCTION WORKS

description: Reviews of performance after construction completion is an important task for enhancing the sustainability of engineering solutions for social needs. This research reviewed and investigated defects in some construction projects of a university. The article analyzed types, causes, and effects of defects in terms of both time and cost dimensions. It collected data through the investigation of how completion certificates and contract documents are issued. It also gathered information on the causes of defects by interviewing project supervisors and those involved projects. The result showed that the majority of defects were in the architectural work, accounting for 57.1% of the total. The chance of having defects depends on the type of project. The main causes were foremen, workers, and working procedures. In the defective projects, defects caused delay in obtaining payment, averaging approximately 26 days. Defects also caused cost increases, averaging 3.3% of the initial contract value. These findings are vital for the construction department of the university to continuously improve and find more sustainable solutions in monitoring and supervising construction projects, so that fewer defects occur.
DOI: 10.25721/tc7d-6r87
title: Mélodie nuptiale "Soubenn al laez (?)" du Vannetais (?)
DOI: 10.12755/isec.res.2014.123
title: THE PUBLIC-PRIVATE PARTNERSHIP IN URBAN RENEWAL

description: This article addresses the issue of Public?Private Partnership (PPP) as a potential tool for urban renewal, in view of budget constraints and a lack of financial resources that affect public authority. In fact, there is increasing application of PPP, driven mainly by municipalities and other local-level entities. The paper reports on two analyses. The first is a comparative study of 15 cases in Italy. The second is research on experiences in two districts of Budapest, Hungary. These analyses offer proposals to facilitate the application of PPP tools, in light of the Italian technical standard UNI/TS 11453 of 2012. This way it is possible to develop a methodology to properly assess the feasibility and financial viability of a project, ensuring transparency in the execution of European public works.
DOI: 10.12755/isec.res.2014.124
title: ATTITUDES OF CLIENTS TOWARDS UNETHICAL BEHAVIOR IN CONSTRUCTION PROJECTS

description: This paper investigates the attitudes of clients towards unethical behavior in construction projects in the Gaza Strip. A questionnaire survey was adapted in this study. A total number of 220 questionnaires were distributed to construction projects clients and 162 questionnaires were returned, a 73.6% response rate. The results indicated that most respondents agreed there is a positive relationship between ethical behavior and long-term profitability of construction organizations. The majority of respondents believed improving ethical practice for professionals could improve ethical performance in construction projects, while unethical behavior may decrease quality. Respondents indicated the major difficulty in developing a strong ethical awareness is that unethical behavior is the prevailing trend within the industry. Most organizations have an ethical code of conduct, but there is great difficulty in applying it due to political and economic conditions. Respondents agreed that the most serious phase in the construction project life cycle affected by unethical behavior is the construction phase, followed by the bid evaluation phase.
DOI: 10.12755/isec.res.2014.125
title: THE IMPORTANCE OF CONSTRUCTION LAW IN CIVIL AND STRUCTURAL ENGINEERING EDUCATION

description: During the process of creating civil or structural engineering curriculums, the people in charge sometimes do not recognize the importance of including interdisciplinary subjects that are not directly related to civil or structural engineering fields, such as construction law. There are a variety of reasons for this. The first part of the paper provides an overview about curriculum?s creation processes at German universities. It describes the involved parties and the difficulties in finding a fair balance between the interests of all involved lecturers while observing the legal guidelines. The second part covers whether or not and to what extent construction law courses should be included in a civil or structural engineering program. It discusses the advantages and disadvantages of including construction law courses. The conclusion is that courses in construction law are necessary to ensure graduates? employability and the qualification to work professionally. However, civil or structural engineering graduates do not have to become Construction Law experts?they only have to acknowledge the seriousness of a situation and to identify a legal problem. This enables the building industry to save money that otherwise might have been spent on unnecessary legal consulting.