cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7710842
title: A comparative performance analysis of four air humidification systems under drought conditions in the Brazilian Midwest

description: Abstract This study examined four air humidification systems and compared their performances under drought conditions in the Brazilian Midwest. Those systems were the electric humidifier, basin with water, wet towel, and an artisanal system made for this study using clay roof tiles. The evaluation was conducted between July and October 2017 in Cuiabá, Brazil. The measurements of the relative humidity were taken in two similar bedrooms, one without a humidifier and another one with an air humidification system. The electric air humidifier provided a continuous and prolonged humidification, maintaining this condition until the end of the measurement period in all situations, but the study highlights the high response time to humidify a space, up to 292 min, and the high relative humidity, around 85%, provided by the humidifier after longer running times. The basin with water system resulted in a humidification of about 59% of the moisture provided by the electric humidifier, while the wet towel, despite producing the best response time in humidifying an environment - up to 18 min, did not maintain the reference humidity until the end of the measurement period under ambient conditions of 43% relative humidity. The artisanal system presented a humidification of about 92% of the moisture provided by the electric humidifier, which demonstrates the potential of the system to increase humidity indoors.
DOI: 10.6084/m9.figshare.7710842.v1
title: A comparative performance analysis of four air humidification systems under drought conditions in the Brazilian Midwest

description: Abstract This study examined four air humidification systems and compared their performances under drought conditions in the Brazilian Midwest. Those systems were the electric humidifier, basin with water, wet towel, and an artisanal system made for this study using clay roof tiles. The evaluation was conducted between July and October 2017 in Cuiabá, Brazil. The measurements of the relative humidity were taken in two similar bedrooms, one without a humidifier and another one with an air humidification system. The electric air humidifier provided a continuous and prolonged humidification, maintaining this condition until the end of the measurement period in all situations, but the study highlights the high response time to humidify a space, up to 292 min, and the high relative humidity, around 85%, provided by the humidifier after longer running times. The basin with water system resulted in a humidification of about 59% of the moisture provided by the electric humidifier, while the wet towel, despite producing the best response time in humidifying an environment - up to 18 min, did not maintain the reference humidity until the end of the measurement period under ambient conditions of 43% relative humidity. The artisanal system presented a humidification of about 92% of the moisture provided by the electric humidifier, which demonstrates the potential of the system to increase humidity indoors.
DOI: 10.6084/m9.figshare.8259287
title: Hybrid wood veneer panels and particleboards for structural use

description: Abstract The use of wood panels has been gaining prominence in the construction industry. MDP panels do not meet structural requirements, unlike OSB and plywood panels. An alternative solution to improve the use of wood particleboard is the reinforcement of wood particleboards (hybrid panels). This research study aimed to evaluate the potential of using hybrid panels made with wood particles and veneers of Pinus sp. and with castor-based bicomponent polyurethane resin, meeting the Brazilian Standard ABNT NBR 14810-2. The physical and mechanical properties results were compared with the normative requirements for OSB (EN 300) and plywood panels (DIN 68792), as well as with the results of commercial plywood OSB panels. Hybrid panels met the standard requirements for OSB and plywood commercial panels indicated for structural use. The statistical analysis indicated the superiority of the physical and mechanical properties of the hybrid panels when compared to the results of the OSB and commercial plywood panels, a result that is also due to the use of the castor resin.
DOI: 10.6084/m9.figshare.8259287.v1
title: Hybrid wood veneer panels and particleboards for structural use

description: Abstract The use of wood panels has been gaining prominence in the construction industry. MDP panels do not meet structural requirements, unlike OSB and plywood panels. An alternative solution to improve the use of wood particleboard is the reinforcement of wood particleboards (hybrid panels). This research study aimed to evaluate the potential of using hybrid panels made with wood particles and veneers of Pinus sp. and with castor-based bicomponent polyurethane resin, meeting the Brazilian Standard ABNT NBR 14810-2. The physical and mechanical properties results were compared with the normative requirements for OSB (EN 300) and plywood panels (DIN 68792), as well as with the results of commercial plywood OSB panels. Hybrid panels met the standard requirements for OSB and plywood commercial panels indicated for structural use. The statistical analysis indicated the superiority of the physical and mechanical properties of the hybrid panels when compared to the results of the OSB and commercial plywood panels, a result that is also due to the use of the castor resin.
DOI: 10.6084/m9.figshare.8259599
title: Experimental analysis on the combined effects of corrosion and fatigue in reinforced concrete beams

description: Abstract Infrastructure elements, especially reinforced concrete bridges and viaducts, are exposed to a combination of degrading processes throughout their life cycle, such as corrosion and fatigue. The combined effects of both processes are known to be more harmful to the structure than the sum of both deterioration processes considered individually. Due to the limited amount of studies in this field, this research aims to evaluate, by experimental analysis, the combined effects of fatigue and corrosion on reinforced concrete beams. Eight beams measuring 7 x 14 x 130 cm were cast and divided in four groups of 2 beams each: one group for reference beams, one for corroded beams with a loss of mass of 10%, one for beams subjected to 200,000 cycles and the last for corroded fatigued beams. The results show that the combined processes drastically reduce the load capacity of the beams by less than half compared to the reference beams. It was also observed that fatigue life decreased and the failure mode changed to fragile.
DOI: 10.6084/m9.figshare.8259599.v1
title: Experimental analysis on the combined effects of corrosion and fatigue in reinforced concrete beams

description: Abstract Infrastructure elements, especially reinforced concrete bridges and viaducts, are exposed to a combination of degrading processes throughout their life cycle, such as corrosion and fatigue. The combined effects of both processes are known to be more harmful to the structure than the sum of both deterioration processes considered individually. Due to the limited amount of studies in this field, this research aims to evaluate, by experimental analysis, the combined effects of fatigue and corrosion on reinforced concrete beams. Eight beams measuring 7 x 14 x 130 cm were cast and divided in four groups of 2 beams each: one group for reference beams, one for corroded beams with a loss of mass of 10%, one for beams subjected to 200,000 cycles and the last for corroded fatigued beams. The results show that the combined processes drastically reduce the load capacity of the beams by less than half compared to the reference beams. It was also observed that fatigue life decreased and the failure mode changed to fragile.
DOI: 10.6084/m9.figshare.11609403
title: Alkaline activation of high-calcium ash and iron ore tailings and their recycling potential in building materials

description: Abstract Alkali-activated materials are agglomerates obtained from the alkaline activation of aluminum- and silicone-rich precursors. The most popular precursors for this type of activation are low-calcium fly ashes, blast furnace slag, and metakaolin. However, both high-calcium ashes (HCAs) and iron ore tailings (IOTs) are interesting wastes that can be investigated as precursors because of their available volume and environmental impact during their final deposition. Therefore, by performing tests of compressive strength, FTIR spectrometry and scanning electron microscopy, we sought to identify the products formed during HCA and IOT activation without thermal treatment. Nine mortar formulations with different HCA and IOT proportions were developed using sodium hydroxide and sodium silicate as activators. Thus, using FTIR spectrometry, we observed the reaction between the industrial wastes. Additionally, the compressive strength result suggested that the material could be used as compressed blocks in masonry walls for the development of more environmentally friendly building materials, which would mitigate the impact of waste disposal and convert industrial solid waste into value-added products.
DOI: 10.6084/m9.figshare.11609403.v1
title: Alkaline activation of high-calcium ash and iron ore tailings and their recycling potential in building materials

description: Abstract Alkali-activated materials are agglomerates obtained from the alkaline activation of aluminum- and silicone-rich precursors. The most popular precursors for this type of activation are low-calcium fly ashes, blast furnace slag, and metakaolin. However, both high-calcium ashes (HCAs) and iron ore tailings (IOTs) are interesting wastes that can be investigated as precursors because of their available volume and environmental impact during their final deposition. Therefore, by performing tests of compressive strength, FTIR spectrometry and scanning electron microscopy, we sought to identify the products formed during HCA and IOT activation without thermal treatment. Nine mortar formulations with different HCA and IOT proportions were developed using sodium hydroxide and sodium silicate as activators. Thus, using FTIR spectrometry, we observed the reaction between the industrial wastes. Additionally, the compressive strength result suggested that the material could be used as compressed blocks in masonry walls for the development of more environmentally friendly building materials, which would mitigate the impact of waste disposal and convert industrial solid waste into value-added products.
DOI: 10.6084/m9.figshare.8259419
title: Influence of particle size of wood waste on the properties of mineral composites: part 1 - cement-wood

description: Abstract Natural fibre composites are an alternative to absorb wood construction and demolition waste (CDW), reducing environmental impact, contributing to the development of more sustainable materials, products, and processes. Researchers have obtained promising results with composites containing different particle sizes. The aim of this study was to evaluate the influence of particle size distribution of wood from CDW on the physical and mechanical properties of cement-wood composites. The wood particles were milled in hammer mills and characterised. Portland cement, a setting time accelerator and water were used. The composites were produced with different binder/wood ratios with the water/cement ratio fixed at 0.50 (by mass). The results of the tests in the fresh and hardened state showed that the values of unit weight of the wood particles influenced the physical properties and, consequently, the mechanical performance of the composites. The study concluded that the P1,2 particle size distribution resulted in lower hardened mass density, while the P1 particle size distribution provided higher tensile strength in flexion.
DOI: 10.6084/m9.figshare.8259419.v1
title: Influence of particle size of wood waste on the properties of mineral composites: part 1 - cement-wood

description: Abstract Natural fibre composites are an alternative to absorb wood construction and demolition waste (CDW), reducing environmental impact, contributing to the development of more sustainable materials, products, and processes. Researchers have obtained promising results with composites containing different particle sizes. The aim of this study was to evaluate the influence of particle size distribution of wood from CDW on the physical and mechanical properties of cement-wood composites. The wood particles were milled in hammer mills and characterised. Portland cement, a setting time accelerator and water were used. The composites were produced with different binder/wood ratios with the water/cement ratio fixed at 0.50 (by mass). The results of the tests in the fresh and hardened state showed that the values of unit weight of the wood particles influenced the physical properties and, consequently, the mechanical performance of the composites. The study concluded that the P1,2 particle size distribution resulted in lower hardened mass density, while the P1 particle size distribution provided higher tensile strength in flexion.
DOI: 10.6084/m9.figshare.8259812
title: Agglomerated cotton gin waste: its production and application in housing construction

description: Abstract The feasibility of producing blocks and boards through the agglomeration of cotton ginnig process waste with calcium binders was proven in previous studies. This waste represents a serious problem for ginning plants, which annually produce a high amount of waste without final destination, as is the case in Argentina. The variability of the annual cotton production, geographical dispersion of ginners and transportation costs make it difficult to propose high-complexity recycling alternatives. This study proposes that that waste is used as a raw material to manufacture composites made of cotton gin waste and portland cement, using simple, easily appropriable and transferable technologies. This paper analyses the characteristics of the composites obtained and the influence that different production parameters have on them and on the productivity of the process. The results achieved show an improvement of the process productivity by using industrial grade additives, as well as better hygrothermal behavior of housing envelopes due to the incorporation of these composites, replacing high cost materials and complex construction technologies.
DOI: 10.6084/m9.figshare.8259812.v1
title: Agglomerated cotton gin waste: its production and application in housing construction

description: Abstract The feasibility of producing blocks and boards through the agglomeration of cotton ginnig process waste with calcium binders was proven in previous studies. This waste represents a serious problem for ginning plants, which annually produce a high amount of waste without final destination, as is the case in Argentina. The variability of the annual cotton production, geographical dispersion of ginners and transportation costs make it difficult to propose high-complexity recycling alternatives. This study proposes that that waste is used as a raw material to manufacture composites made of cotton gin waste and portland cement, using simple, easily appropriable and transferable technologies. This paper analyses the characteristics of the composites obtained and the influence that different production parameters have on them and on the productivity of the process. The results achieved show an improvement of the process productivity by using industrial grade additives, as well as better hygrothermal behavior of housing envelopes due to the incorporation of these composites, replacing high cost materials and complex construction technologies.
DOI: 10.6084/m9.figshare.8259596.v1
title: Computational modeling of evacuation dynamics in places of assembly

description: Abstract This article analyses the parameters related to evacuation in places of assembly and the technical standards associated with emergency exits, seeking to estimate their contemporaneity due to the evolution process of buildings and social changes. To undertake the study, the researchers selected a building classified as a social club, as well as data obtained from architectural plans and inspections at the site that could be used to create a computer model. The evacuation software used was Pathfinder, which provides two simulation models, SFPE and Steering, the former having a methodology similar to the one used by the current standards and the latter, a model that approaches that of the expected movement of people in a real situation. With the simulations, data on evacuation time, specific flow, flow rate, and evacuation dynamics were obtained, with the possibility of identifying congestion points, bottlenecks and obstacles. The conclusions showed that the safety level provided by the emergency exit standards for the building studied and destined for public assembly is not as expected. Even recently updated technical standards are still fruit of a merely prescriptive review, and do not provide conditions for the development of innovative, economic and, above all, safer solutions.
DOI: 10.6084/m9.figshare.8259596
title: Computational modeling of evacuation dynamics in places of assembly

description: Abstract This article analyses the parameters related to evacuation in places of assembly and the technical standards associated with emergency exits, seeking to estimate their contemporaneity due to the evolution process of buildings and social changes. To undertake the study, the researchers selected a building classified as a social club, as well as data obtained from architectural plans and inspections at the site that could be used to create a computer model. The evacuation software used was Pathfinder, which provides two simulation models, SFPE and Steering, the former having a methodology similar to the one used by the current standards and the latter, a model that approaches that of the expected movement of people in a real situation. With the simulations, data on evacuation time, specific flow, flow rate, and evacuation dynamics were obtained, with the possibility of identifying congestion points, bottlenecks and obstacles. The conclusions showed that the safety level provided by the emergency exit standards for the building studied and destined for public assembly is not as expected. Even recently updated technical standards are still fruit of a merely prescriptive review, and do not provide conditions for the development of innovative, economic and, above all, safer solutions.
DOI: 10.5281/zenodo.6624023
title: Solidago caesia decontaminated gx

description: .
DOI: 10.5281/zenodo.6624022
title: Solidago caesia decontaminated gx

description: .
DOI: 10.6084/m9.figshare.11609196
title: CFD simulation and measurement of the thermal behavior inside a room of the institutional library: a comparative study

description: Abstract This article presents the results of the comparison between the CFD simulation and temperature measurements, both in the time domain, at a certain point of interest within a specific closed space (cubicle) of the institutional library of the Salesian Polytechnic University (UPS), at its headquarters in the city of Cuenca, Republic of Ecuador. In this specific case, solar radiation is considered as the main heat transfer mechanism, which is why it was considered in the applied simulation method. An acceptable relative error was obtained between the simulated and measured temperature values. During the summer period, the thermal conditions inside the cubicle are not suitable for the comfort of the users. The study developed can constitute a basic tool for possible future research related to the implementation of climate conditioning for the cubicle, the library in general and any other site with similar constructive and operational characteristics.
DOI: 10.6084/m9.figshare.11609196.v1
title: CFD simulation and measurement of the thermal behavior inside a room of the institutional library: a comparative study

description: Abstract This article presents the results of the comparison between the CFD simulation and temperature measurements, both in the time domain, at a certain point of interest within a specific closed space (cubicle) of the institutional library of the Salesian Polytechnic University (UPS), at its headquarters in the city of Cuenca, Republic of Ecuador. In this specific case, solar radiation is considered as the main heat transfer mechanism, which is why it was considered in the applied simulation method. An acceptable relative error was obtained between the simulated and measured temperature values. During the summer period, the thermal conditions inside the cubicle are not suitable for the comfort of the users. The study developed can constitute a basic tool for possible future research related to the implementation of climate conditioning for the cubicle, the library in general and any other site with similar constructive and operational characteristics.
DOI: 10.6084/m9.figshare.8260127.v1
title: Acoustic performance of door and wall sets separated by entrance hall

description: Abstract The set of walls and doors separated by communal circulation areas in residential buildings began to have their acoustic performance evaluated since the Brazilian standard NBR 15575 was implemented. The aim of this paper is to determine the influence of the characteristics of the constructive elements - doors and corridors between housing units - on the insulation of the air noise of the set of walls and doors separated by the entrance hall. Three buildings were chosen and a series of acoustic performance tests were performed on the site, covering several situations. Devices were used to seal the door gaps in order to verify the improvement of the performance of the system. The results point to loss of acoustic performance with larger gaps between the door and the floor. In addition, a relationship was detected between the reverberation time of the circulation environments and the distance between the entrance doors of the housing units. The conclusion of the study is that frontal alignment of the entrance doors of the different housing units and corridors with high reverberation time as well as badly sealed gaps reduce the acoustic insulation efficiency of the set of doors and wall facing communal circulation areas in residential buildings.
DOI: 10.6084/m9.figshare.8260127
title: Acoustic performance of door and wall sets separated by entrance hall

description: Abstract The set of walls and doors separated by communal circulation areas in residential buildings began to have their acoustic performance evaluated since the Brazilian standard NBR 15575 was implemented. The aim of this paper is to determine the influence of the characteristics of the constructive elements - doors and corridors between housing units - on the insulation of the air noise of the set of walls and doors separated by the entrance hall. Three buildings were chosen and a series of acoustic performance tests were performed on the site, covering several situations. Devices were used to seal the door gaps in order to verify the improvement of the performance of the system. The results point to loss of acoustic performance with larger gaps between the door and the floor. In addition, a relationship was detected between the reverberation time of the circulation environments and the distance between the entrance doors of the housing units. The conclusion of the study is that frontal alignment of the entrance doors of the different housing units and corridors with high reverberation time as well as badly sealed gaps reduce the acoustic insulation efficiency of the set of doors and wall facing communal circulation areas in residential buildings.