cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14287237
title: Evaluation of alternatives for reducing household potable water consumption: case study in Caruaru, PE, Brazil

description: Abstract In a scenario of water crisis, such as that experienced by the Brazilian Agreste region in recent years, the sustainability of water supply has been the aim of several investigations. This research project involved the study of the hypothetical implementation of technological alternatives for reducing household potable water consumption in Caruaru, PE. The alternatives were evaluated from a multicriteria perspective. That perspective takes into account environmental, technical, economic and social criteria, which are identified through designs, market research and interviews with residents and experts. With the application of the multicriteria method Promethee II, it was possible to verify that the implementation of water-saving devices is the most suitable alternative for the region. This alternative promotes a 29.11% reduction in water consumption, while the payback period was estimated at 16 months. The long term required to recover the capital in the other alternatives highlights the need for government policies offering financial incentives to the population, preventing the region’s socioeconomic conditions from being the main obstacle for the adoption of water resources conservation practices.
DOI: 10.6084/m9.figshare.14287235
title: Reciprocal frame structures: a systematic literature review and identification of critical points for design and production

description: Abstract Reciprocal Frame Structures (RFs) date from the Neolithic period, where they were originally produced in wood and comprised of small sized elements. It is also a structural system that can adapt to freeform and complex geometries, with great aesthetic potential, as indicated by several contemporary research studies. However, these structures could make better use of the digital technologies available for design, analysis, manufacturing and assembly. This paper aims to identify the current gaps where research efforts focus on in order to make RF technology more viable. A systematic literature review (SLR) was performed in seven different databases. A total of 180 articles were found, of which 49 were selected for analysis. 27 of those papers identified existing gaps, which were then compiled into five categories: (a) difficulties in geometric / structural design; (b) need for enhancement of digital tools; (c) difficulty in connections design, analysis, manufacturing and assembly; (d) difficulty in understanding the real contribution of prototypes to large scale applications; and (e) need to incorporate the assembly process in the design of RF. The study concluded that the development of new structural analysis devices combined with the creation of new constructive details may contribute to expanding the use of RFs.
DOI: 10.6084/m9.figshare.14287232
title: Impact noise isolation on a floor system with coating application on the original floor

description: Abstract The classification of acoustic performance to impact noise in floor systems provided for in NBR 15575-3 (ABNT, 2013) is only required for new multi-floor buildings. This article addresses the noise problems occurring in buildings constructed before 2013. This study seeks for an alternative form of acoustic correction by applying a new coating on the original flooring. In order to do this, the following conditions were considered: ease of execution and lower increment in the total thickness of the floor system. An experimental study was performed in two acoustic chambers and on the field (residential building), where acoustic efficiency was verified in a real case. The new coatings applied on the original floor (enamelled ceramic) were: wood laminate; extra fine porcelain tiles and the same type of ceramic as the original flooring. The two latter did not have a resilient material between them and the original floor. The results showed that the proposed alternative has the potential to correct impact noise problems in floor systems between superimposed autonomous dwelling units. The systems using laminate wood on the original floor proved to be the most effective, as they combine greater acoustic insulation against the impact noise (until 28 dB), small increase in the final thickness of the system (1.6 cm) and ease of execution.
DOI: 10.6084/m9.figshare.14287231
title: Physical-mechanical production and evaluation of medium and high density waste panels

description: Abstract Brazil has seen a growing number of studies on the use of sawdust from industrial processes for the production of wood panels with added value to minimise forest exploration. In this article, five treatments with mixtures of wood particles from carpentry shops and sugarcane bagasse were examined. For particle homogenisation, granulometric composition studies were conducted; subsequently, three panels were made for each treatment, with the addition of 10% of polyurethane resin from castor oil, and evaluations were performed to determine the physical and mechanical properties of the panels. The physical and mechanical properties obtained with the mixtures with 50% of sawdust and 50% of sugarcane bagasse indicated that the production of panels for indoor use under dry conditions is possible.
DOI: 10.6084/m9.figshare.14287226
title: Evaluation of the incorporation of construction waste (CW) for the stabilization of soil-cement mixtures

description: Abstract The reuse of construction waste (CW) has been increasingly adopted as a way to reduce the environmental impact from inadequate disposal of this material worldwide. The stabilization of soils with cement is a common practice, enabling the use of this material in a variety of projects. However, depending on the type of soil, frequently large quantities of cement are needed, making the technique impracticable. The use of CW in the soil stabilization process may be an alternative for reducing the amount of cement and improving the strength of the mixture. The objective of this work was to investigate the use of CW to partially replace a lateritic clay soil in soil-cement mixtures. Besides the natural soil (S), a mixture of soil and CW (S-CW) was used with proportions of 50% of each. The cement content levels evaluated were 0%, 4%, 6% and 8% and the curing periods varied from 7 to 28 days. The results showed superior strength values for the S-CW compared to the soil-cement. This confirms that the use of CW reduces the percentage of cement necessary for the stabilization of a clayey soil and presents an alternative, more environmentally appropriate destination for this material.
DOI: 10.6084/m9.figshare.14287225
title: Isoviews applied to location of information units for pedestrian mobility

description: Abstract In Urban Mobility, one of the most discouraging factors for the movement of pedestrians is the lack of information on urban areas. The proper availability of spatial information, such as pedestrian routes, the proximity of bus stops are among the factors that improve the quality of mobility and promote the appropriation of public areas. Information, when well-located, tends to provide greater space clarity and displacement optimisation. Thus, a method was developed to identify the spatial location of Pedestrian Information Units (PIUs) using the Spatial Syntax tool, the Isovists analysis and the Depthmap software. This method was applied at a subway station “Praça do Relógio” in Brasilia, DF, and that made it possible to identify the highest potential and visibility points for the positioning of PIUs, thus assisting urban interventions to integrate pedestrian movements into the transport system. Furthermore, the method can also be applied, with the necessary adaptations, to the terminals and stopping points of other modes of public transport.
DOI: 10.6084/m9.figshare.14287223
title: Mortar with refractory waste for passive fire protection

description: Abstract Passive fire protection (PFP) is a field of study applied to the civil construction industry. Refractory brick waste contains elements that can contribute to the properties necessary for PFP. Therefore, this study developed a mortar with refractory brick waste for use as PFP. The authors proposed four formulations with compressive and flexural strength, bulk density and apparent porosity, thermal conductivity, and linear variation that were evaluated before and after heat treatment at 600 °C and 1100 °C. The density did not show significant differences between the formulations. The porosity increased after the heat treatment. The mixture that showed the highest shrinkage at 1100 °C was the one with the highest gypsum content, and all the other ones had shrinkage values lower than the maximum allowed by the C195 standard. The mixture that used the highest amount of gypsum was the one that obtained the lowest thermal conductivity. Therefore, it is concluded that using refractory waste is viable for the development of PFP mortars because they meet the regulatory requirements.
DOI: 10.6084/m9.figshare.14287221
title: Self-compacting soil-cement with incorporation of sand from construction waste for application in a vertical panel system

description: Abstract The aim of this study is to analyse the influence of the incorporation of construction waste (CW) sand on the physical and mechanical behaviour of self-compacting soil-cement (SCSC) mixes, aiming at its application in a monolithic vertical panel system. The research method consists of conducting laboratory tests, considering an initial proportion of cement-soil with a 1:5 ratio, and four additional mixes, in which soil was replaced by CCW sand at intervals of 25% up to 100%, in mass. In the fresh state, tests were conducted to determine fluid consistency (ranging from 660 to 750 mm), mass density and the air content incorporated in the mixes. In the hardened state, simple compressive strength, water absorption and voids content tests were undertaken. Improvements in the workability and mass flow rate were observed in the hybrid mixes, and higher mechanical strengths were obtained with the incorporation of 25% and 50% of CCW sand, indicating an ideal dosage within this interval. In addition, the incorporation of CCW sand reduced water absorption, with values below 20% in all hybrid mixes. The study concluded that the use of CCW sand in SCSC mixes has the potential to be applied in the Vertical Monolithic Panel System.
DOI: 10.6084/m9.figshare.14287220
title: Relationship between shear strength and compressive strength parallel to grains of hardwoods

description: Abstract In Brazil, the standard NBR 7190: 1997 establishes testing methods to determine the physical and mechanical properties of the material. However, the tests require that the procedures be undertaken in specialised, high-cost laboratories. The Brazilian code sets different values for relations between shear strength and compression strength parallel to the grain. The aim of this study was to investigate the relation between compressive strength and shear strength parallel to the grain, considering the results of the tests of those properties. The results were compared with the relation values set by the Brazilian Standard NBR 7190:1997, and the optimal coefficient found was 86.4% higher than the coefficient set by the Brazilian standard, considering the set of all species. With regards to the variation in the relation between the investigated properties, considering the different classes of wood resistance in this study, no decreases were found in the values of the optimal coefficients as the classes increase (a situation described in the NBR 7190:1997 standard), which represent one further divergent result.
DOI: 10.6084/m9.figshare.14287217
title: Portland clinker with civil construction waste: influence of pellet geometry on the formation of crystalline phases

description: Abstract Efforts to reduce greenhouse gas emissions in the context of sustainable development have intensified, with the development of research aimed at the production of new materials and binders for construction. This article analyzes the influence of pellet geometry in the production of clinkers, with the incorporation of construction waste (CCW). Procedures adapted from the method proposed by Brazilian Portland Cement Association were adopted in studies of laboratory clinkers, in an attempt to simulate the stages of the industrial process. Pellets were prepared with the same formulation, however, with four different geometries: spherical, with diameters of 1 cm, 2 cm and 3 cm, with manual molding, and semi-spherical, with a diameter of 2 cm, using molds of PLA (polylactic acid) printed on a 3D printer to facilitate the molding of the clinkers in a standardized way. Clinkers were characterized mineralogically by x-ray diffraction (XRD) and the Rietveld method was used to quantify the phases. Variations in the quantities of the alite and belite phases were observed depending on the geometry of the pellets, although the same calcination conditions were used. This is probably due to the variation in the surface area (exposure area) and the gradients of the cooling rate.
DOI: 10.6084/m9.figshare.14287216
title: Use of calcined water treatment sludge as supplementary cementitious material

description: Abstract When sludge from water treatment plants (WTP), is calcined, it has chemical compounds similar to those found in cementing raw materials, enabling its use as supplementary cementitious material (SCM). The aims of this study are as follows: 1) chemical and physical characterisation of calcined sludge originated from a WTP located in Venâncio Aires (RS) at a temperature of 700 ° C (LETAC) for 1 hour,, 2) evaluation of the influence of its incorporation, in percentages of 10% and 25% , as SCM in pastes and mortars. Microstructural and mechanical tests were performed. The calorimetry results indicate that the waste has a filler and chemical effect. The thermogravimetric analysis showed that the incorporation of sludge in cement pastes promoted the consumption of calcium hydroxide (40% reduction in the composition with 25% of LETAC) and consequent formation of C-S-H. The results of the DRX show that the amount of amorphous phases was 11% higher in the paste with 25% of LETAC, confirming the additional development of C-S-H. Concerning the mechanical properties, no significant loss of compressive strength was observed in pastes when waste substitution of up to 25% was used.
DOI: 10.6084/m9.figshare.14287214
title: Production of agroindustrial ashes with pozzolanic activity via acid leaching, conjugated burning and ultrafine grinding

description: Abstract This paper aims to study the production and the physical and chemical characterization of rice husk, sugarcane bagasse, corn straw, and bamboo leaf ashes to use as pozzolans. The ash production steps basically consisted of raw material collection, chemical treatment by citric acid leaching, conjugated burning (thermal processing) and ultrafine grinding (mechanical processing) of the produced ashes. The results indicated that all ashes could be classified as pozzolanic additions based on specific standards. The high pozzolanicity of the ashes was confirmed by testing the electrical conductivity, mechanical performance index, and hydration kinetics of cement pastes by isothermal calorimetry. Therefore, the production processes used in this work were effective in producing highly reactive pozzolanic materials.
DOI: 10.5281/zenodo.4625198
title: ARTEMIS Observations of Plasma Waves in Laminar and Perturbed Interplanetary Shocks: Shock Parameters

description: Table of interplanetary shock parameters for the events in "ARTEMIS Observations of Plasma Waves in Laminar and Perturbed Interplanetary Shocks", by the same authors, submitted to the Astrophysical Journal (currently under review; manuscript # AAS27604R1). Parameters were calculated from WIND and ARTEMIS observations. Note that WIND is located at L1, and interplanetary shocks can evolve between L1 and the near-Earth environment, resulting in potentially different values for the shock parameters. Averages for values were taken a upstream and downstream of the transition region during 3-5 minute intervals where values were roughly steady and not near the transition region. Analysis was done in the spacecraft frame. Further information can be found in the paper listed above (doi link pending). Columns include the Satellite whose observations were used for the calculation for a given row (Satellite), the date of the shock event (Date), the upstream plasma beta (Beta_up), the ratio of downstream (dn) to upstream (up) average magnetic field (Bdn/Bup), ion density (Ndn/Nup), electron temperature (Tedn/Teup), and ion temperature (Tidn/Tiup), the change in velocity caused by the shock (Vdown-Vup; km/s), the shock normal in Geocentric Solar Elliptical (GSE) coordinates (Shock normal; GSE), the shock angle with respect to the background magnetic field (Theta Bn; degrees), the shock speed (Vshn_up; km/s), the Alfven (M_A), fast (M_f), and the first critical Mach numbers (M_cr), and lastly the ratio of the fast mode to the critical Mach numbers (M_f/M_cr). Error estimates are included. Calculation of parameters made use of the Rankine-Hugoniot equations. Grey highlights signify the parameters used in the accompanying paper.
DOI: 10.5281/zenodo.4625197
title: ARTEMIS Observations of Plasma Waves in Laminar and Perturbed Interplanetary Shocks: Shock Parameters

description: Table of interplanetary shock parameters for the events in "ARTEMIS Observations of Plasma Waves in Laminar and Perturbed Interplanetary Shocks", by the same authors, submitted to the Astrophysical Journal (currently under review; manuscript # AAS27604R1). Parameters were calculated from WIND and ARTEMIS observations. Note that WIND is located at L1, and interplanetary shocks can evolve between L1 and the near-Earth environment, resulting in potentially different values for the shock parameters. Averages for values were taken a upstream and downstream of the transition region during 3-5 minute intervals where values were roughly steady and not near the transition region. Analysis was done in the spacecraft frame. Further information can be found in the paper listed above (doi link pending). Columns include the Satellite whose observations were used for the calculation for a given row (Satellite), the date of the shock event (Date), the upstream plasma beta (Beta_up), the ratio of downstream (dn) to upstream (up) average magnetic field (Bdn/Bup), ion density (Ndn/Nup), electron temperature (Tedn/Teup), and ion temperature (Tidn/Tiup), the change in velocity caused by the shock (Vdown-Vup; km/s), the shock normal in Geocentric Solar Elliptical (GSE) coordinates (Shock normal; GSE), the shock angle with respect to the background magnetic field (Theta Bn; degrees), the shock speed (Vshn_up; km/s), the Alfven (M_A), fast (M_f), and the first critical Mach numbers (M_cr), and lastly the ratio of the fast mode to the critical Mach numbers (M_f/M_cr). Error estimates are included. Calculation of parameters made use of the Rankine-Hugoniot equations. Grey highlights signify the parameters used in the accompanying paper.
DOI: 10.6084/m9.figshare.14287211
title: Influence of electric arc furnace dust and lime kiln waste in Portland cement hydration

description: Abstract Studies have indicated that the use of electric arc furnace dust (EAFD) results in a delay in the hydration time of Portland cement. Calcium-rich waste such as lime kiln waste (LKW) is one of the techniques used to offset this delay as it accounts for the lack of this element in calcium silicate hydrate (C-S-H) production in the mixture. The objective of this study was to evaluate the influence of electric arc furnace dust (EAFD) and lime kiln waste (LKW) in the hydration process of Portland cement pastes and their influence in setting time and hydration heat. The methodology used required several steps: physiochemical and micro-structural characterization of waste samples; definition and production cement pastes with different levels of waste substitution and a reference paste and evaluation of the cement pastes with respect to setting time and hydration heat. Results showed that the substitution of 1% EAFD with or without LKW presented similar hydration heats as the reference paste. This indicated that EAFD+LKW substitution would not affect substantially the hydration reactions of cement and could allow waste recycling in construction materials.
DOI: 10.6084/m9.figshare.14287210
title: Influence of the granulometric fractions of recycled sands on the mechanical properties of Portland cement mortars

description: Abstract This research study is based on the assumption that the granulometric fractions of recycled small aggregates present different characteristics and, therefore, these characteristics would influence the mechanical behaviour of mortars differently. This paper proposes the study of the granulometric fractions of two recycled sands: SD1 (sand from construction waste and demolition) and SD2 (sand from concrete waste). The recycled sands were submitted to physical characterisation and FRX tests, and subsequently incorporated in mortars. The results showed that the recycled sands form two groups with different characteristics and tendencies: (1) the "coarse fractions” group, formed by the coarse fractions and (2) "fine fractions” group, formed by the fine and fine- medium fractions. The study demonstrated that the diversity of the source materials of the SD1 sand led the cement paste to dilute in its fractions, whereas in the SD2 sand, it concentrated mainly in the "fine fractions". Thus, the "fine fractions" of the SD1 sand are similar to the IPT sand (used as reference) and more adequate than those of the SD2 sand. The study concluded that the mechanical behaviour of mortars differ as the granulometric fraction is replaced, increasing the possibilities of application of recycled small aggregates in the design of cement mixtures.
DOI: 10.6084/m9.figshare.14287209
title: Concretes with binary mixtures of artificial pozzolans and concrete demolition waste

description: Abstract The objective of this study is to analyse the use of binary mixtures of pozzolanic materials and concrete demolition waste in concrete mixtures, especially the resulting mechanical properties and durability. A total of ten concrete formulations were produced distinguishing them in different types using different Portland cements, different artificial pozzolans and coarse aggregates from concrete demolition. The particular properties of each formulation were verified by testing the axial compressive strength, longitudinal modulus of elasticity and penetration of chloride under immersion. Substitutions were of 15% w.t. and 30% w.t. natural coarse aggregate substituted with concrete demolition waste and, in the case of binary mixtures, additional 25% w.t. of the binder agglomerate substituted with rice husk ash or fly ash. Results showed that the final strength to axial compression and modulus of elasticity of concrete mixtures were negatively affected by utilising demolition waste, but this effect was balanced by adding supplementary cementitious materials. Regarding the durability test, it was found that the lowest coefficients occurred in the mixtures using CP V-ARI, together with artificial pozzolans, in mixtures with 15% w.t. substitution of natural aggregate with recycled aggregate. It was concluded that using recycled aggregates in concrete is viable but conditioned to the concomitant use of pozzolanic materials.