cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.20026643
title: Geopolymetric binder produced with fly ash and sodium hydroxide

description: Geopolymeric binders are an alternative material to Portland cement that it are obtained by fly ash polycondensation in an alkaline medium, as long as criteria for selection of precursor materials, mixing parameters and curing regime are observed. By employing ground fly ash and a sodium hydroxide solution, the effect on flexural and compressive strength of prismatic specimens was evaluated through changing solution concentration (8 M, 12 M and 16 M), fly ash - alkaline solution ratio by mass (0.50, 0.55, 0.60, 0.65, 0.70), curing regime (in oven or moist chamber) and age (1, 3 or 7 days) according to the aim of each evaluation. The findings of this study were that a second thermal curing may be dismissed and strength values remained stable over time. In addition, the investigation showed a strong effect between mixing parameters, since strength was improved by increasing the molar concentration and reducing the materials mass ratio.
DOI: 10.6084/m9.figshare.20026646.v1
title: Influence of water-retaining cellulose ethers on the properties of bedding mortar used in concrete structural masonry

description: The aim of this study was to investigate the influence of water-retaining cellulose ethers agent on the bedding mortar in concrete structural masonry. Hydroxypropylmethyl cellulose (HPMC) was used in different proportions in a cement-lime based mortar (0.00%, 0.03%, 0.06% and 0.09% of the total dry weight) to evaluate the influence of cellulose ethers on the properties of mortars in the fresh and hardened states. In addition, prisms were produced from three concrete blocks and mini-prisms were sawed off concrete blocks to evaluate compressive strength, modulus of elasticity and bond strength. The results showed that there is potential in the use of water-retaining cellulose ethers agent in the bedding mortar of concrete structural masonry, since that there was an increase in the water retention capacity of the mortars and the use of these products did not influence the compressive strength of the mortar and the masonry prisms. However the compressive strength of the bedding mortar joints, the modulus of elasticity of the prisms and the bond strength in flexion were significantly reduced, when cellulose ether was used.
DOI: 10.6084/m9.figshare.20026648
title: Obtenção de concreto leve utilizando agregados reciclados

description: Lightweight concrete can be obtained by replacing conventional aggregates by a lower density aggregate, such as expanded clay, which also present high porosity and high water absorption. These properties resemble those of recycled aggregates from construction waste, contributing to the achievement of a lightweight concrete. However, recycled aggregates have characteristics that make them very different: variable composition, low resistance to abrasion, more irregular shapes. This article analyses some properties of recycled coarse aggregates and their influence on the behaviour of lightweight concrete in fresh and hardened state. The study used two types of recycled coarse aggregates, one originating from concrete blocks with EPS (ARBCE) and another one from ceramic blocks (ARBC), with the purpose of understanding the variability of the materials characterising the composition of these aggregates in order to verify the feasibility of application of these aggregates in lightweight concrete. The aggregates were crushed by two different equipments (mortar mixer mill and hammer mill). The recycled aggregates obtained through these different crushing processes presented different size distribution and shapes. In spite of that, it was possible to produce the two recycled lightweight concretes using both aggregate types. The compressive strength at 28 days was between 9.0 and 13.0 MPa, pointing to their use in elements without any structural function, but applicable in building components of moderate strength (e.g. panels and blocks).
DOI: 10.6084/m9.figshare.20026648.v1
title: Obtenção de concreto leve utilizando agregados reciclados

description: Lightweight concrete can be obtained by replacing conventional aggregates by a lower density aggregate, such as expanded clay, which also present high porosity and high water absorption. These properties resemble those of recycled aggregates from construction waste, contributing to the achievement of a lightweight concrete. However, recycled aggregates have characteristics that make them very different: variable composition, low resistance to abrasion, more irregular shapes. This article analyses some properties of recycled coarse aggregates and their influence on the behaviour of lightweight concrete in fresh and hardened state. The study used two types of recycled coarse aggregates, one originating from concrete blocks with EPS (ARBCE) and another one from ceramic blocks (ARBC), with the purpose of understanding the variability of the materials characterising the composition of these aggregates in order to verify the feasibility of application of these aggregates in lightweight concrete. The aggregates were crushed by two different equipments (mortar mixer mill and hammer mill). The recycled aggregates obtained through these different crushing processes presented different size distribution and shapes. In spite of that, it was possible to produce the two recycled lightweight concretes using both aggregate types. The compressive strength at 28 days was between 9.0 and 13.0 MPa, pointing to their use in elements without any structural function, but applicable in building components of moderate strength (e.g. panels and blocks).
DOI: 10.6084/m9.figshare.20026649
title: The salt efflorescence in the Church of Santo Alexandre, Belém - PA

description: The structural masonry of the historical monuments of the city of Belém, Brazil, is made of stones and solid bricks fixed with lime mortar, which is affected by different pathologies, including salt efflorescence and moisture action. Some authors explain that these two agents cause layer detachment, mortar pulverization, cracks and a whitened appearance. This aim of this study was to identify the degradation process affecting the masonry of the right transept of the Church of Santo Alexandre, using instrumental analytical techniques. Laboratory analyses were used in order to understand the saline efflorescence process, the material damage it causes and the main kinds of salts. The first step in the study was to map out the masonry and the damage, showing the current situation and the most damaged areas. That was followed by a physical characterisation through an analysis of mortar particle sizes and proportions, analysis of masonry moisture contents, chemical characterisation -qualitative and quantitative chemical analysis of soluble salts, and mineralogical characterisation by X-ray diffraction. The techniques applied were effective and contributed to the achievement of a correct diagnosis, guiding the type of interventions required to solve the problem.
DOI: 10.6084/m9.figshare.20026652.v1
title: Evaluating window systems for decision support regarding the balance of daylight and heat gains

description: Designing windows requires dealing with the external environmental conditions, which may be conflicting, such as solar gains and daylight. This paper evaluates the performance of different alternatives for window systems to support design decisions on the balance of light and heat gains in the indoor environment, focusing on offices in a hot and humid climate. In order to do this, integrated computer simulations using the Daysim and EnergyPlus softwares were performed, considering the activation of electric lighting only when daylight was not sufficient to meet the usage requirements. The variables were window-to-wall ratio, glazing type and shading angle, simultaneously. Compromise solutions were found regarding the criteria of availability and uniformity of daylight and electricity demand in the indoor environment. It was observed that solar control through the use of shading devices presented substantially better results than solar control by reducing transmission of solar radiation by the glass. The assessment conducted contributes to increase understanding about the impact of different design variables on the phenomena characterising the performance of fenestration systems.
DOI: 10.6084/m9.figshare.20026651.v1
title: Evaluation of the structural performance Howe trusses made of Glued Laminated Bamboo

description: This paper presents and discusses the experimental analyses of reduced models of Howe trusses made from Glued Laminated Bamboo (GLB). Dendrocalamus giganteus bamboo was used to make the trusses' battens, which had their bamboo layer glued with two types of glue (resorcinol-formaldehyde and polyvinyl acetate). The trusses were 2.5 m long and 0.4 m high. In order to design the trusses, a prior analysis of their joints was made, and three variables were investigated: the angle of the joints, the number of batten layers and the glue types. All trusses failed by buckling with a load 175% higher than the design load. Finally, it was observed that the joints and the GLB trusses presented suitable structural behavior.
DOI: 10.6084/m9.figshare.20026661
title: A study on causes of construction delays in real estate projects in the metropolitan region of São Paulo

description: The aim of this article is to list the main causes of delays in Brazilian real estate projects. Based on a literature review, this article starts by identifying the factors that affect construction times around the world, focusing on developing countries. The conditions and difficulties that entrepreneurs and builders face in those countries are probably the same as those in Brazil. Based on this list of delays, a classification and correlation was established, identifying possible causes. This framework was used to perform analytical research in 32 construction works executed in the metropolitan region of São Paulo in the past 7 years. The results showed that although entrepreneurs' interference significantly affects the projects (at least in this sample), the main problems seem to be related much more to internal and organizational issues on the construction site, which are the responsibility of construction managers, than to issues external to the construction environment (rain, soil, market changes, suppliers, customer engagement, etc.). This aspect reinforces the importance of investing in training, planning and control systems and methodologies, even if simplified.
DOI: 10.6084/m9.figshare.20026652
title: Evaluating window systems for decision support regarding the balance of daylight and heat gains

description: Designing windows requires dealing with the external environmental conditions, which may be conflicting, such as solar gains and daylight. This paper evaluates the performance of different alternatives for window systems to support design decisions on the balance of light and heat gains in the indoor environment, focusing on offices in a hot and humid climate. In order to do this, integrated computer simulations using the Daysim and EnergyPlus softwares were performed, considering the activation of electric lighting only when daylight was not sufficient to meet the usage requirements. The variables were window-to-wall ratio, glazing type and shading angle, simultaneously. Compromise solutions were found regarding the criteria of availability and uniformity of daylight and electricity demand in the indoor environment. It was observed that solar control through the use of shading devices presented substantially better results than solar control by reducing transmission of solar radiation by the glass. The assessment conducted contributes to increase understanding about the impact of different design variables on the phenomena characterising the performance of fenestration systems.
DOI: 10.6084/m9.figshare.20026658
title: Evaluation of water consumption on taps at a university campus

description: Currently, water consumption is on the agenda of most organizations around the world. As well as the environmental benefits brought about by a more efficient use of natural resources; there are also economic reasons to reduce operational costs. This paper presents the results of measurements made on water taps at the Pontifical Catholic University of Campinas, Brazil. The measurements were obtained automatically through a wireless sensor network, using Rfbee and Xbee devices specifically designed to collect the data. The main results show that water consumption is high and that measures must be taken to reduce consumption to less than 5 litres per minute.
DOI: 10.6084/m9.figshare.20026660
title: Comparative study of managerial practices and EVM management theory: the case of construction

description: Indicators are a major management tool that organizations use to monitor project performance. The EVM indicator has widely been used for about 40 years. Nevertheless, only few studies have been conducted about its use in the construction industry. In addition, some authors claim that the theoretical foundation of EVM has been incorrectly used in the construction industry. The main objective of this article is to present a comparative study of the theoretical foundations and the practical use of the EVM indicator. This is an exploratory study involving a case study in 5 construction projects. After the field research, the practices used were identified and compared with the EVM theory. The researchers observed that there were critical success factors such as: staff training, maturity in project management, support from high management, and the need of pre-defined procedures. They also observed that the EVM offered benefits such as better cost control, scope and communication about the project's performance. Additionally, they concluded that the method applied enabled the successful achievement of the goals and the validation of the research hypothesis.
DOI: 10.6084/m9.figshare.20026666.v1
title: Motorway-urban interfaces in the process of production of cities: case study of the João Pessoa ring road, PB, Brazil

description: Motorways play an important role in the development of the structure of cities, as they facilitate long distance journeys. However, when absorbed into the urban fabric, motorways develop particular dynamics with the intra-urban space where they are inserted, changing accessibility, morphology and the use and occupation of urban land. The aim of this paper is to analyse the dynamics between the implementation of the BR-230 motorway ring road and the process of urban space production in the city of João Pessoa-PB, Brazil, between 1963 and 2013, in terms of morphology and the use and occupation of urban land. The method employed was the Evolutionary Logic of the Urban Fabric, which divides urban evolution into three stages: overcoming limits, growth and combination/conflicts. This method was used in association with analytical tools, such as the Space Syntax software and the Geographic Information System. The results showed that the motorway boosted urban sprawl towards the southern sector of the city and produced a sprawling urban area. The study also identified a horizontal and fragmented growth pattern, changes in accessibility, land use and socio-spatial segregation.
DOI: 10.6084/m9.figshare.20026666
title: Motorway-urban interfaces in the process of production of cities: case study of the João Pessoa ring road, PB, Brazil

description: Motorways play an important role in the development of the structure of cities, as they facilitate long distance journeys. However, when absorbed into the urban fabric, motorways develop particular dynamics with the intra-urban space where they are inserted, changing accessibility, morphology and the use and occupation of urban land. The aim of this paper is to analyse the dynamics between the implementation of the BR-230 motorway ring road and the process of urban space production in the city of João Pessoa-PB, Brazil, between 1963 and 2013, in terms of morphology and the use and occupation of urban land. The method employed was the Evolutionary Logic of the Urban Fabric, which divides urban evolution into three stages: overcoming limits, growth and combination/conflicts. This method was used in association with analytical tools, such as the Space Syntax software and the Geographic Information System. The results showed that the motorway boosted urban sprawl towards the southern sector of the city and produced a sprawling urban area. The study also identified a horizontal and fragmented growth pattern, changes in accessibility, land use and socio-spatial segregation.
DOI: 10.5517/ccdc.csd.cc29xwlq
title: CCDC 2142924: Experimental Crystal Structure Determination

description: Related Article: Lixia Chen|2022|CSD Communication|||
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/ccdc.csd.cc29xwmr
title: CCDC 2142925: Experimental Crystal Structure Determination

description: Related Article: Lixia Chen|2022|CSD Communication|||
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/ccdc.csd.cc29ynhf
title: CCDC 2143665: Experimental Crystal Structure Determination

description: Related Article: Leilei Song, Lihan Chen, Sanfeng He, Kexin Zhang, Ju Huang, Yuanke Chen, Xuedi Qin, Songwei Zhang, Yanhang Ma, Yongjin Lee, Tao Li|2022|J.Mater.Chem.A|10|6607|doi:10.1039/D1TA10745C
description: Related Article: Leilei Song, Lihan Chen, Sanfeng He, Kexin Zhang, Ju Huang, Yuanke Chen, Xuedi Qin, Songwei Zhang, Yanhang Ma, Yongjin Lee, Tao Li|2022|CSD Communication|||
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/ccdc.csd.cc2b4mrw
title: CCDC 2149408: Experimental Crystal Structure Determination

description: Related Article: Nivedita Chaudhri, Matthew J. Guberman-Pfeffer, Matthias Zeller, Christian Brückner|2022|J.Org.Chem.|87|7179|doi:10.1021/acs.joc.2c00399
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/ccdc.csd.cc2b4msx
title: CCDC 2149409: Experimental Crystal Structure Determination

description: Related Article: Nivedita Chaudhri, Matthew J. Guberman-Pfeffer, Matthias Zeller, Christian Brückner|2022|J.Org.Chem.|87|7179|doi:10.1021/acs.joc.2c00399
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.6084/m9.figshare.20026670
title: Influence of land use on surface temperature: a case study in João Pessoa - PB

description: Abstract This paper investigates land use change and assesses its impact on surface temperature in the city of João Pessoa, Paraíba State, between 1991 and 2010. Landsat images were utilized to quantify the changes and surface temperature variability in 1991, 2006 and 2010. The images were pre-processed using calibration techniques and geometric and atmospheric corrections were performed. Supervised classification using the Maximum Likelihood technique and spatial reclassification were employed for land use classification. Five land-use/land-cover categories (urban area, shrubland vegetation, herbaceous vegetation and water) were identified. The integration of Remote Sensing and Geographical Information Systems was applied to examine the impact of land-use change on surface temperatures. The results revealed a notable land-use change in the study area. The most significant changes in land use and land cover classes occurred in urban areas and herbaceous vegetation. The highest values of surface temperature were estimated on the urban classes and bare soil. The results also showed that the greatest temperature variation occurred in the period between 2006 and 2010 due to the increase in the urban area class in all areas of João Pessoa.
DOI: 10.6084/m9.figshare.20026670.v1
title: Influence of land use on surface temperature: a case study in João Pessoa - PB

description: Abstract This paper investigates land use change and assesses its impact on surface temperature in the city of João Pessoa, Paraíba State, between 1991 and 2010. Landsat images were utilized to quantify the changes and surface temperature variability in 1991, 2006 and 2010. The images were pre-processed using calibration techniques and geometric and atmospheric corrections were performed. Supervised classification using the Maximum Likelihood technique and spatial reclassification were employed for land use classification. Five land-use/land-cover categories (urban area, shrubland vegetation, herbaceous vegetation and water) were identified. The integration of Remote Sensing and Geographical Information Systems was applied to examine the impact of land-use change on surface temperatures. The results revealed a notable land-use change in the study area. The most significant changes in land use and land cover classes occurred in urban areas and herbaceous vegetation. The highest values of surface temperature were estimated on the urban classes and bare soil. The results also showed that the greatest temperature variation occurred in the period between 2006 and 2010 due to the increase in the urban area class in all areas of João Pessoa.
DOI: 10.6084/m9.figshare.20026669
title: Thermal history and comfort in a Brazilian subtropical climate: a 'cool' addiction hypothesis

description: Abstract Currently, there is a rising trend for commercial buildings to use air conditioning to provide indoor thermal comfort. This paper focuses on the impact of prolonged exposure to indoor air-conditioned environments on occupants' thermal acceptability and preferences in a mixed-mode building in Brazil. Questionnaires were administered while indoor microclimatic measurements were carried out (i.e., air temperature, radiant air temperature, air speed and humidity). Results suggest significant differences in occupants' thermal acceptability and cooling preferences based on thermal history; differences were found between groups based on different physical characteristics (i.e., different gender and body condition). The findings also indicated a significant potential to implement temperature fluctuations indoors when occupants are exposed to air conditioning environments in warm and humid climates.