cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.5720731.v1
title: Degradation of rendering mortars made with fine concrete aggregates by thermal cycles

description: Abstract This study evaluates the loss of the properties of rendering mortars with recycled fine aggregate submitted to thermal cycling tests based on the NBR 15575-4 (ABNT, 2013) standard. The mortars were produced at a mix-proportion of 1:1:6 in volume (cement, lime and sand) using Brazilian cement CP II F-32, CH-I lime putty, river sand and fine aggregate produced from recycled concrete, in compositions with 2, 4.5, 7 and 9.5% relatively to the mass of sand. The rendering mortars were applied on ceramic substrate and evaluated, at 28 days of age, for bond tensile strength (NBR 13528 (ABNT, 2010)), surface hardness determined by Shore durometer type D (ASTM D 2240-5 (AMERICAN..., 2005)) and the velocity of ultrasound waves. The systems formed by the rendering mortars applied on the ceramic substrate were subjected to accelerated ageing by exposure to thermal cycling, which degraded the mortars. All rendering mortars presented superficial hardness decline (in the order of 10%), lowered velocity of ultrasound waves (about 25%) and lowered bond tensile strength by about 15%. The evaluation of the rupture of the rendering mortars showed that those with 2 e 4.5% fine aggregate content suffered the greater degradation.
DOI: 10.6084/m9.figshare.5719066
title: Effect of cement consumption on rendering mortars produced according the concepts of packing particles and mobility

description: Abstract The reduction of cement consumption in rendering mortar composition is an alternative to reduce the environmental impact in the binder production chain. The use of supplementary cementitious materials (SCM) and the dosage based on the concepts of particle packing and mobility are strategies that can result in designed properties both fresh as hardened state. The objective of this study was to illustrate the influence of the change in binder consumption in the properties of formulated rendering mortars keeping constant the particle size distribution, resulting in negligible variation in packing porosity. The cement consumption was ranged from 8 to 16% by mass, with the addition of limestone filler as SCM, with the consistency has being the same due to the alteration of the water content of the mortars. The results indicated that the reduction in cement consumption adversely affect the properties of the mortar in the hardened state, but still quite comply with the requirements for this type of rendering.
DOI: 10.6084/m9.figshare.5719066.v1
title: Effect of cement consumption on rendering mortars produced according the concepts of packing particles and mobility

description: Abstract The reduction of cement consumption in rendering mortar composition is an alternative to reduce the environmental impact in the binder production chain. The use of supplementary cementitious materials (SCM) and the dosage based on the concepts of particle packing and mobility are strategies that can result in designed properties both fresh as hardened state. The objective of this study was to illustrate the influence of the change in binder consumption in the properties of formulated rendering mortars keeping constant the particle size distribution, resulting in negligible variation in packing porosity. The cement consumption was ranged from 8 to 16% by mass, with the addition of limestone filler as SCM, with the consistency has being the same due to the alteration of the water content of the mortars. The results indicated that the reduction in cement consumption adversely affect the properties of the mortar in the hardened state, but still quite comply with the requirements for this type of rendering.
DOI: 10.6084/m9.figshare.5718895
title: Concrete behavior under high temperatures in factorial experimental design with star configuration

description: Abstract Motivated by the need for studies on the residual capacity of concrete after high temperature situations, this research study presents the use of the experimental design planning methodology with star configuration, formally denominated central composite rotatable design (CCRD), to study the compressive strength of concrete specimens heated in ovens. With the use of this tool, the variables water/cement ratio and temperature were analyzed together, taken each at five different levels, according to a predefined statistical methodology. We also used thermogravimetric tests that allow verifying the different levels of damage for different points of the cross section and the effect of carbonation and rehydration on the concrete. In addition, the study detected the existence of an intermediate zone at which the temperature increases the production of hydration products, leading to a discussion about the protection of concrete structures by controlling the water/cement ratio.
DOI: 10.6084/m9.figshare.5718895.v1
title: Concrete behavior under high temperatures in factorial experimental design with star configuration

description: Abstract Motivated by the need for studies on the residual capacity of concrete after high temperature situations, this research study presents the use of the experimental design planning methodology with star configuration, formally denominated central composite rotatable design (CCRD), to study the compressive strength of concrete specimens heated in ovens. With the use of this tool, the variables water/cement ratio and temperature were analyzed together, taken each at five different levels, according to a predefined statistical methodology. We also used thermogravimetric tests that allow verifying the different levels of damage for different points of the cross section and the effect of carbonation and rehydration on the concrete. In addition, the study detected the existence of an intermediate zone at which the temperature increases the production of hydration products, leading to a discussion about the protection of concrete structures by controlling the water/cement ratio.
DOI: 10.6084/m9.figshare.5719852
title: Particle breakage in Construction Waste (CW) induced by compaction

description: Abstract In recent decades, the generation of construction waste (CW) has become a significant issue throughout the world. Therefore, the reuse of this material is becoming increasingly important, particularly in projects with high material demand, such as road works. However, the application of these waste products depends on knowledge about the chemical and mechanical properties of the material. One parameter of crucial importance is the susceptibility to particle breakage, since it directly influences the behaviour of the material in terms of resistance and permeability. This study evaluated particle breakage in CW, induced by compaction through the application of standard and modified energy. In order to do that, the material was divided into fractions of different particle sizes. Then, the influence of each of the following factors was analysed: energy, grain size, mineralogy, moisture content and the density of the sample. The results indicated that the occurrence of particle breakage is directly related to the mineralogical composition, and that the largest fraction studied was the one that suffered the smallest particle breakage. Additionally, the results indicated that the density of compaction of the sample also has significant influence on the process of particle breakage.
DOI: 10.6084/m9.figshare.5719852.v1
title: Particle breakage in Construction Waste (CW) induced by compaction

description: Abstract In recent decades, the generation of construction waste (CW) has become a significant issue throughout the world. Therefore, the reuse of this material is becoming increasingly important, particularly in projects with high material demand, such as road works. However, the application of these waste products depends on knowledge about the chemical and mechanical properties of the material. One parameter of crucial importance is the susceptibility to particle breakage, since it directly influences the behaviour of the material in terms of resistance and permeability. This study evaluated particle breakage in CW, induced by compaction through the application of standard and modified energy. In order to do that, the material was divided into fractions of different particle sizes. Then, the influence of each of the following factors was analysed: energy, grain size, mineralogy, moisture content and the density of the sample. The results indicated that the occurrence of particle breakage is directly related to the mineralogical composition, and that the largest fraction studied was the one that suffered the smallest particle breakage. Additionally, the results indicated that the density of compaction of the sample also has significant influence on the process of particle breakage.
DOI: 10.7916/d8-cpry-wv37
title:  GRID3 Democratic Republic of the Congo Settlement Extents Version 01, Alpha

description: NOTE: This initial version of the Democratic Republic of the Congo settlement extents has been superseded by the final version, "GRID3 Democratic Republic of the Congo Settlement Extents, Version 01", now available here: https://doi.org/10.7916/d8-j86k-nz49 The database constitutes a comprehensive set of settlement polygons nationwide. It is in geodatabase format and consists of three feature classes for built up areas (BUA), small settlement areas (SSA), and hamlets (hamlets). This work has been undertaken as part of the Geo-referenced Infrastructure and Demographic Data for Development (GRID3) initiative in Democratic Republic of the Congo. GRID3 works with countries to generate, validate and use geospatial data on population, settlements, infrastructure, and subnational boundaries. For more information, see https://grid3.org/ Keywords: built up areas, BUA, small settlement areas, SSA, hamlets, settlement aggregation, settlement extent, CIESIN, GRID3, Novel-T
DOI: 10.6084/m9.figshare.5719690
title: Rheological behavior during squeeze flow of concentrated suspensions of spheres in different viscosities silicone oils

description: Abstract Squeeze flow is one of the main techniques used to evaluate the rheological behaviour of mortars. This type of material can be considered as a reactive, heterogeneous and concentrated suspension with a wide range of particle sizes, and its rheological behaviour is influenced by the quantity and characteristics of its constituents. In order to evaluate some phenomena in detail, it is interesting to reduce the factors that influence the flow of the material. Thus, this paper assesses the rheological behaviour of concentrated suspensions of macroscopic glass spheres in Newtonian fluids with different viscosities (silicone oils: 100, 1000 e 10000 cSt) aiming to analyse liquid and solid interactions as well as the occurrence of phase separation. Suspensions with 60% and 70%vol of spheres were subjected to squeeze flow tests at different displacement rates (0.01, 0.1 and 1.0 mm/s). The increase in liquid content changed the main phenomena governing the flow: (i) at low liquid volume, friction between particles, liquid lubrication capacity and cohesion generated by meniscus formation have a major effect; while (ii) in suspensions with liquid content enough to separate the particles, the fluid viscosity, drag force and permeability of the granular system determine the rheological behaviour of the suspension and the occurrence of phase separation.
DOI: 10.6084/m9.figshare.5719690.v1
title: Rheological behavior during squeeze flow of concentrated suspensions of spheres in different viscosities silicone oils

description: Abstract Squeeze flow is one of the main techniques used to evaluate the rheological behaviour of mortars. This type of material can be considered as a reactive, heterogeneous and concentrated suspension with a wide range of particle sizes, and its rheological behaviour is influenced by the quantity and characteristics of its constituents. In order to evaluate some phenomena in detail, it is interesting to reduce the factors that influence the flow of the material. Thus, this paper assesses the rheological behaviour of concentrated suspensions of macroscopic glass spheres in Newtonian fluids with different viscosities (silicone oils: 100, 1000 e 10000 cSt) aiming to analyse liquid and solid interactions as well as the occurrence of phase separation. Suspensions with 60% and 70%vol of spheres were subjected to squeeze flow tests at different displacement rates (0.01, 0.1 and 1.0 mm/s). The increase in liquid content changed the main phenomena governing the flow: (i) at low liquid volume, friction between particles, liquid lubrication capacity and cohesion generated by meniscus formation have a major effect; while (ii) in suspensions with liquid content enough to separate the particles, the fluid viscosity, drag force and permeability of the granular system determine the rheological behaviour of the suspension and the occurrence of phase separation.
DOI: 10.6084/m9.figshare.5719390
title: Assessment of environmental and economic feasibility of rainwater harvesting systems in low-income house: case study in Florianópolis, SC

description: Abstract The main objective of this paper is to assess the environmental impact and investment feasibility analysis of rainwater harvesting systems for a low-income house located in Florianópolis, southern Brazil, by using the concepts of Life Cycle Analysis (LCA). The environmental and investment feasibility analysis was performed for two scenarios, i.e., a scenario in which there is only a potable water system supplied by the water utility, and another scenario in which the potable water system is complemented by rainwater. Three types of rainwater storage tanks were analysed: plastic reinforced with glass fibre, high density polyethylene and reinforced concrete. The results indicate that plastic tanks reinforced with glass fibre are environmentally more feasible, while concrete tanks are economically more feasible. This study showed the importance of analysing environmental and economic aspects before implementing a system for rainwater utilization; thus better choices regarding the materials used in the systems, aiming at sustainability in buildings, can be made.
DOI: 10.6084/m9.figshare.5720167.v1
title: Evaluation of operating conditions of plumbing fixtures in public buildings

description: Abstract Water for human consumption in building systems is susceptible to various forms of waste. Sometimes, water misuse is a result of the end of lifetime of plumbing fixtures and lack of maintenance. This paper presents the operating conditions of plumbing fixtures in ten public buildings in Joinville, SC, Brazil. It was detected that more than 56.0% of toilets and urinals presented leakages, 2.5% of taps presented some constant dripping, and also that 31.0% of them presented valve leakage when the flow time was activated. The flow rate of taps, drinking fountains and showers was also measured and compared with the values established in the Brazilian standards and LEED and AQUA environmental certifications. The consumption indicators of the ten buildings are also presented and they range from 16.6 to 69.3 litres/user per day.
DOI: 10.6084/m9.figshare.5720167
title: Evaluation of operating conditions of plumbing fixtures in public buildings

description: Abstract Water for human consumption in building systems is susceptible to various forms of waste. Sometimes, water misuse is a result of the end of lifetime of plumbing fixtures and lack of maintenance. This paper presents the operating conditions of plumbing fixtures in ten public buildings in Joinville, SC, Brazil. It was detected that more than 56.0% of toilets and urinals presented leakages, 2.5% of taps presented some constant dripping, and also that 31.0% of them presented valve leakage when the flow time was activated. The flow rate of taps, drinking fountains and showers was also measured and compared with the values established in the Brazilian standards and LEED and AQUA environmental certifications. The consumption indicators of the ten buildings are also presented and they range from 16.6 to 69.3 litres/user per day.
DOI: 10.6084/m9.figshare.20026948
title: Active and passive solar energy integration in single-family dwelling roofs of real estate developments

description: Abstract This study analyses the possibility of achieving negative energy demands in single-family housing (Plus-Energy House). Through the integration of energy efficiency measures jointly with active solar systems, it is possible to obtain high performance energy models. In order to demonstrate this, we performed energy simulations integrating active solar systems, and also possible self-shading and separations between dwellings. We analysed the deployment of BIPV, BISTw, BIPVTa and BIPVTw technologies individually and in different combinations between them with the purpose of maximizing production capability for self-consumption, comparing them with residential demands in order to identify energy deficits and surpluses in different seasons. The measurements were taken hourly on typical days in summer, winter and intermediary seasons. Finally, an annual balance was obtained, showing energy surpluses of approximately 174 % when deploying only BIPV collectors and 251 % when combining BIPVTw and BIPVTa.
DOI: 10.6084/m9.figshare.5718838
title: Impact of human activities on the concentration of indoor air particles in an antarctic research station

description: Abstract One of the main characteristics of Antarctic buildings is the fact that they are designed mostly with a focus on energy efficiency. Although human activity is a major source of pollution, indoor air quality is not a matter of significant concern during building planning. This study examines the relationship between indoor activities in an Antarctic Research Station and the size distribution of particulate matter. Real-time particle size distribution data is used in conjunction with time-activity data. The activity number ratio is calculated using the mean number of particles found in each size range during each activity divided by the average number of particles found during a period characterized by the absence of human activities. Cooking, the use of cosmetics, waste incineration and exhaust from light vehicles were responsible for significant deterioration of indoor air related to the presence of fine and ultrafine particles. Cleaning, physical exercise and the movement of people were responsible for the emission of coarse particles. This article emphasizes the importance of post-occupancy evaluation of buildings, generating results relevant to the planning and layout of new buildings, especially regarding better indoor air quality.
DOI: 10.6084/m9.figshare.5718838.v1
title: Impact of human activities on the concentration of indoor air particles in an antarctic research station

description: Abstract One of the main characteristics of Antarctic buildings is the fact that they are designed mostly with a focus on energy efficiency. Although human activity is a major source of pollution, indoor air quality is not a matter of significant concern during building planning. This study examines the relationship between indoor activities in an Antarctic Research Station and the size distribution of particulate matter. Real-time particle size distribution data is used in conjunction with time-activity data. The activity number ratio is calculated using the mean number of particles found in each size range during each activity divided by the average number of particles found during a period characterized by the absence of human activities. Cooking, the use of cosmetics, waste incineration and exhaust from light vehicles were responsible for significant deterioration of indoor air related to the presence of fine and ultrafine particles. Cleaning, physical exercise and the movement of people were responsible for the emission of coarse particles. This article emphasizes the importance of post-occupancy evaluation of buildings, generating results relevant to the planning and layout of new buildings, especially regarding better indoor air quality.
DOI: 10.6084/m9.figshare.5718463
title: The behaviour of adaptive thermal comfort models compared to the Fanger model in intensivists adapted to a tropical climate

description: Abstract The aim of this study was to investigate the behaviour of adaptive models of thermal comfort (aPMVy e aPMVk) as compared with the classical Fanger model (PMV) for the prediction of the actual thermal sensation of intensivist professionals adapted to the tropical climate, seeking to identify the limits of agreement between such methods. The samples were collected at nine public Intensive Care Units (ICUs) in the city of João Pessoa, Paraíba, Brazil and the estimates obtained by the models were compared by applying the concordance between Bland-Altman methods. The tests revealed that, among the selected methods, the one that showed the least bias estimating the real sensation was the classic PMV, compared with adaptive models indicated for individuals acclimatized to hot and humid regions, which are characteristic of tropical climates. However, the amplitude of the bias depended on the estimation range, i.e., as the estimation was kept between -1.5 and 0.2 values, the bias tended to be minimized. The mutual correlation analysis between tests showed that the PMV and aPMVk are equivalent when their estimates are between -0.5 and 0.5, indicating that the weighting factor for adaptability offered by the aPMVk model was not enough to provide acclimatization in the sample considered.
DOI: 10.6084/m9.figshare.5718463.v1
title: The behaviour of adaptive thermal comfort models compared to the Fanger model in intensivists adapted to a tropical climate

description: Abstract The aim of this study was to investigate the behaviour of adaptive models of thermal comfort (aPMVy e aPMVk) as compared with the classical Fanger model (PMV) for the prediction of the actual thermal sensation of intensivist professionals adapted to the tropical climate, seeking to identify the limits of agreement between such methods. The samples were collected at nine public Intensive Care Units (ICUs) in the city of João Pessoa, Paraíba, Brazil and the estimates obtained by the models were compared by applying the concordance between Bland-Altman methods. The tests revealed that, among the selected methods, the one that showed the least bias estimating the real sensation was the classic PMV, compared with adaptive models indicated for individuals acclimatized to hot and humid regions, which are characteristic of tropical climates. However, the amplitude of the bias depended on the estimation range, i.e., as the estimation was kept between -1.5 and 0.2 values, the bias tended to be minimized. The mutual correlation analysis between tests showed that the PMV and aPMVk are equivalent when their estimates are between -0.5 and 0.5, indicating that the weighting factor for adaptability offered by the aPMVk model was not enough to provide acclimatization in the sample considered.