cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.12094716.v1
title: Effect of Moisture Content on the Behavior of High Strength Concrete at High Temperatures

description: ABSTRACT In this paper, an experimental program was carried out to investigate the residual mechanical properties of high strength concrete and normal strength concrete, and how moisture content and temperature affect the spalling process. Three mixtures with water-cementitious material ratios, from 0.25 to 0.50, and with different saturation levels were heated in an electric furnace to elevated temperatures, from 200°C to 600°C. After heating, the specimens were cooled down to room temperature and then tested for compression and tensile strength. The results showed that high moisture content induces the spalling process and reduces considerably the mechanical properties of high strength concrete, mainly at temperatures above 400°C.
DOI: 10.6084/m9.figshare.12094926
title: Effect of gypsum content on the compressive strength of LC3 cement

description: ABSTRACT The cement industry has been required to minimize the CO2 emissions caused by the Portland cement manufacturing process. The use of supplementary cementitious materials (MCS's) replacing part of the clinker is one of the most viable options to reduce the emission of this pollutant. LC3 cement is a new type of cement that uses high MCS contents, counting on the synergistic reaction between calcined clay and limestone to obtain mechanical strength similar to that of traditional cements. This research intends to investigate the influence of the gypsum content on the compressive strength of a LC3 cement at 1, 3, 7, 28 and 91 days, considering that the effects of the gypsite content on the mechanical resistance of the LC3 cement are little understood. For the accomplishment of this study six mortars were produced. In three of them the reference cement (clinker + gypsum) was produced with 3.5% gypsum, without additions. In three mortars an LC3 cement with 45% clinker replacement (30% calcined clay and 15% limestone) was used. The proportion of gypsum in these cements was 3, 5 and 7% in relation to the total mass. The properties in the fresh state were evaluated by means of the spreading test, taking into account the superplasticizer content used in each mortar. For the hardened state analysis, the compressive strengths were compared at the ages of 1, 3, 7, 28 and 91 days. A statistical analysis (ANOVA and DUNCAN test) was performed on the results. From the results obtained it was possible to verify that the gypsite content influences the compressive strength of the LC³ cement. In the early ages, from 1 to 7 days, the greatest results of compressive strength were obtained by cements with gypsum contents of 5%. At these three ages the 5% gypsum LC3 cement had comparable results with the reference cements. At 28 and 91 days LC3 cements with 7% gypsum led to the highest values of compressive strength, and the highest value at 91 days was 40.0 MPa, comparable to the reference cements.
DOI: 10.6084/m9.figshare.12094926.v1
title: Effect of gypsum content on the compressive strength of LC3 cement

description: ABSTRACT The cement industry has been required to minimize the CO2 emissions caused by the Portland cement manufacturing process. The use of supplementary cementitious materials (MCS's) replacing part of the clinker is one of the most viable options to reduce the emission of this pollutant. LC3 cement is a new type of cement that uses high MCS contents, counting on the synergistic reaction between calcined clay and limestone to obtain mechanical strength similar to that of traditional cements. This research intends to investigate the influence of the gypsum content on the compressive strength of a LC3 cement at 1, 3, 7, 28 and 91 days, considering that the effects of the gypsite content on the mechanical resistance of the LC3 cement are little understood. For the accomplishment of this study six mortars were produced. In three of them the reference cement (clinker + gypsum) was produced with 3.5% gypsum, without additions. In three mortars an LC3 cement with 45% clinker replacement (30% calcined clay and 15% limestone) was used. The proportion of gypsum in these cements was 3, 5 and 7% in relation to the total mass. The properties in the fresh state were evaluated by means of the spreading test, taking into account the superplasticizer content used in each mortar. For the hardened state analysis, the compressive strengths were compared at the ages of 1, 3, 7, 28 and 91 days. A statistical analysis (ANOVA and DUNCAN test) was performed on the results. From the results obtained it was possible to verify that the gypsite content influences the compressive strength of the LC³ cement. In the early ages, from 1 to 7 days, the greatest results of compressive strength were obtained by cements with gypsum contents of 5%. At these three ages the 5% gypsum LC3 cement had comparable results with the reference cements. At 28 and 91 days LC3 cements with 7% gypsum led to the highest values of compressive strength, and the highest value at 91 days was 40.0 MPa, comparable to the reference cements.
DOI: 10.6084/m9.figshare.12094713
title: Effect of supercritical carbon dioxide on cement pastes containing waste FCC catalyst

description: ABSTRACT The residual catalyst (CR) from Fluid Catalytic Cracking (FCC) in petroleum refineries has been studied as pozzolan in cementitious materials to evaluate the development of mechanical properties and durability. However, studies on the degradation of these materials with supercritical carbon dioxide (scCO2) are recent. This article evaluates the degradation of hardened pastes with replacement of cement mass by CR (0%, 15% and 30% CR) exposed for 7 h to scCO2, in the temperature and pressure condition estimated at 760 m depth (53,55 °C / 12,41 MPa). The density of the slurries was set at 1.89 g/cm3 and curing time of 28 days. The formulation of the slurries and supercritical condition aimed to simulate the application in the structure of an onshore well in the northeast of Brazil, considering that the contact with scCO2 happens after the hardening of the slurries. The microstructure was evaluated by X-ray diffraction (XRD) and Thermal Analysis (TG / DTG and DTA), hardness measured by Rockwell surface hardness (HR15T) and carbonated areas calculated after the pH indicator solution was sprayed. The slurries containing CR had reduced surface hardness and higher free water content, indicating a higher porosity in relation to pure cement slurries. The pozzolanic reactions of CR caused partial reduction of calcium hydroxide [Ca(OH)2] content and formation of cementitious compounds [C-S-H, C-A-S-H, C-A-H and Af(t)]. After exposure to scCO2, the pastes with CR had a larger area/depth of carbonation than the 0% CR paste. The formation of CaCO3 resulted in an increase in surface hardness mainly in the pastes with CR. Due to the reactions with scCO2, the CR-containing pastes had partially decalcified cementitious compounds but remained equivalent to or higher than those found in the 0% CR paste whose carbonatation caused a partial reduction of Ca(OH)2.
DOI: 10.6084/m9.figshare.12094713.v1
title: Effect of supercritical carbon dioxide on cement pastes containing waste FCC catalyst

description: ABSTRACT The residual catalyst (CR) from Fluid Catalytic Cracking (FCC) in petroleum refineries has been studied as pozzolan in cementitious materials to evaluate the development of mechanical properties and durability. However, studies on the degradation of these materials with supercritical carbon dioxide (scCO2) are recent. This article evaluates the degradation of hardened pastes with replacement of cement mass by CR (0%, 15% and 30% CR) exposed for 7 h to scCO2, in the temperature and pressure condition estimated at 760 m depth (53,55 °C / 12,41 MPa). The density of the slurries was set at 1.89 g/cm3 and curing time of 28 days. The formulation of the slurries and supercritical condition aimed to simulate the application in the structure of an onshore well in the northeast of Brazil, considering that the contact with scCO2 happens after the hardening of the slurries. The microstructure was evaluated by X-ray diffraction (XRD) and Thermal Analysis (TG / DTG and DTA), hardness measured by Rockwell surface hardness (HR15T) and carbonated areas calculated after the pH indicator solution was sprayed. The slurries containing CR had reduced surface hardness and higher free water content, indicating a higher porosity in relation to pure cement slurries. The pozzolanic reactions of CR caused partial reduction of calcium hydroxide [Ca(OH)2] content and formation of cementitious compounds [C-S-H, C-A-S-H, C-A-H and Af(t)]. After exposure to scCO2, the pastes with CR had a larger area/depth of carbonation than the 0% CR paste. The formation of CaCO3 resulted in an increase in surface hardness mainly in the pastes with CR. Due to the reactions with scCO2, the CR-containing pastes had partially decalcified cementitious compounds but remained equivalent to or higher than those found in the 0% CR paste whose carbonatation caused a partial reduction of Ca(OH)2.
DOI: 10.6084/m9.figshare.12094947
title: Partial replacement of small aggregate by ground glass residue in the production of mortar

description: ABSTRACT One of the consequences of the industrial expansion process is the generation of large amounts of waste. Among all the waste generated stand out the glass packaging, which is one of the materials with the longest decomposition present in landfills and other deposits. Among the different types of glass packaging that are used are the long neck bottles, which are today a major problem due to their disposal after use. In this context, in order to minimize this environmental problem, we highlight the construction sector, which is an excellent way to incorporate waste. The objective of this work is to study the viability of using long neck milled bottles to partially replace sand in the production of mortar. For this purpose, fresh consistency and flexural tensile strength, compressive strength and hardened capillary water absorption tests were performed. The percentages of replacement of fine aggregate by ground glass residue were 10, 15, 25 and 50 % at 7, 28, 63 and 91 days. As a result, in the mechanical strength tests, resistances were obtained statistically equal to or higher than the reference trait, and the highest strengths were obtained with the 50 % residue of ground glass. In the capillary water absorption test, all traces of mortar presented high coefficient of capillarity, being considered unsuitable for use in coating mortars.
DOI: 10.6084/m9.figshare.12094947.v1
title: Partial replacement of small aggregate by ground glass residue in the production of mortar

description: ABSTRACT One of the consequences of the industrial expansion process is the generation of large amounts of waste. Among all the waste generated stand out the glass packaging, which is one of the materials with the longest decomposition present in landfills and other deposits. Among the different types of glass packaging that are used are the long neck bottles, which are today a major problem due to their disposal after use. In this context, in order to minimize this environmental problem, we highlight the construction sector, which is an excellent way to incorporate waste. The objective of this work is to study the viability of using long neck milled bottles to partially replace sand in the production of mortar. For this purpose, fresh consistency and flexural tensile strength, compressive strength and hardened capillary water absorption tests were performed. The percentages of replacement of fine aggregate by ground glass residue were 10, 15, 25 and 50 % at 7, 28, 63 and 91 days. As a result, in the mechanical strength tests, resistances were obtained statistically equal to or higher than the reference trait, and the highest strengths were obtained with the 50 % residue of ground glass. In the capillary water absorption test, all traces of mortar presented high coefficient of capillarity, being considered unsuitable for use in coating mortars.
DOI: 10.5517/ccdc.csd.cc266f62
title: CCDC 2031963: Experimental Crystal Structure Determination

description: Related Article: Svetlana E. Korolenko, Aleksey S. Kubasov, Lyudmila V. Goeva, Varvara V. Avdeeva, Elena A. Malinina, Nikolay T. Kuznetsov|2021|Inorg.Chim.Acta|520|120315|doi:10.1016/j.ica.2021.120315
DOI: 10.5517/ccdc.csd.cc266f73
title: CCDC 2031964: Experimental Crystal Structure Determination

description: Related Article: Svetlana E. Korolenko, Aleksey S. Kubasov, Lyudmila V. Goeva, Varvara V. Avdeeva, Elena A. Malinina, Nikolay T. Kuznetsov|2021|Inorg.Chim.Acta|520|120315|doi:10.1016/j.ica.2021.120315
DOI: 10.6084/m9.figshare.12094950
title: Use potential of a paper sludge waste from tissue paper industries in cementitious materials

description: ABSTRACT The purpose of this study was to evaluate a paper sludge waste obtained from tissue paper industries regarding its potential for use in cementitious materials. The chemical composition of the waste was assessed and mixtures were made with 0%, 5% and 10% additions of the material, by mass of cement. The cement matrices were analysed experimentally by isothermal calorimetry, compressive strength and tensile strength by diametric compression, water absorption by capillarity, apparent mass density and dynamic modulus of elasticity. The results obtained were not satisfactory, since the addition of the paper sludge waste showed an increase in the cement consumption to reach the required compressive strength, as well as a rise in water consumption in order to maintain the mortar consistency.
DOI: 10.6084/m9.figshare.12094950.v1
title: Use potential of a paper sludge waste from tissue paper industries in cementitious materials

description: ABSTRACT The purpose of this study was to evaluate a paper sludge waste obtained from tissue paper industries regarding its potential for use in cementitious materials. The chemical composition of the waste was assessed and mixtures were made with 0%, 5% and 10% additions of the material, by mass of cement. The cement matrices were analysed experimentally by isothermal calorimetry, compressive strength and tensile strength by diametric compression, water absorption by capillarity, apparent mass density and dynamic modulus of elasticity. The results obtained were not satisfactory, since the addition of the paper sludge waste showed an increase in the cement consumption to reach the required compressive strength, as well as a rise in water consumption in order to maintain the mortar consistency.
DOI: 10.6084/m9.figshare.12094929
title: Study of the proportion of calcined clay and limestone filer in the LC3 cement at different replacement levels

description: ABSTRACT Brazil still has a low cement consumption (260 kg / inhab./year) when compared to the world average (553 kg / inhab./year), coupled with the country's high housing and infrastructure deficit and the expectation of population growth, points to a resumption of production growth in the medium / long term, increasing between 60% and 120% in 2050 compared to 2014 (in the low and high demand variants, respectively), however, the cement industry is adversely affected by about 5% of the world's CO2 emissions. Brazil is currently one of the world references in reducing the amount of clinker in cement. Therefore, different mineral additions are used to replace clinker in cement production, and several studies have been developed to further increase the use of these additions. , which represents the industry's main alternative and challenge in mitigating its emissions. Blast furnace slag and fly ash are already being used for this purpose, however, they are not sufficiently available to meet current market demand. Research looks for mineral additions that are in abundance all over the planet. The calcined clay and limestone filer were efficient when used simultaneously, giving rise to a new cement, LC³. This research proposes to analyze the percentage of substitution and relation between the additions that provides better compressive strength with greater sustainability of the LC³ cements. Mortars were made of cements with different levels of clinker replacement by mineral additions. The results indicate the technical viability of the good performance obtained by the LC³ cement, capable of replacing up to 45% of the clinker quantity, with substitution ratios of 2: 1 and 3: 1 (calcined clay: limestone.
DOI: 10.6084/m9.figshare.12094929.v1
title: Study of the proportion of calcined clay and limestone filer in the LC3 cement at different replacement levels

description: ABSTRACT Brazil still has a low cement consumption (260 kg / inhab./year) when compared to the world average (553 kg / inhab./year), coupled with the country's high housing and infrastructure deficit and the expectation of population growth, points to a resumption of production growth in the medium / long term, increasing between 60% and 120% in 2050 compared to 2014 (in the low and high demand variants, respectively), however, the cement industry is adversely affected by about 5% of the world's CO2 emissions. Brazil is currently one of the world references in reducing the amount of clinker in cement. Therefore, different mineral additions are used to replace clinker in cement production, and several studies have been developed to further increase the use of these additions. , which represents the industry's main alternative and challenge in mitigating its emissions. Blast furnace slag and fly ash are already being used for this purpose, however, they are not sufficiently available to meet current market demand. Research looks for mineral additions that are in abundance all over the planet. The calcined clay and limestone filer were efficient when used simultaneously, giving rise to a new cement, LC³. This research proposes to analyze the percentage of substitution and relation between the additions that provides better compressive strength with greater sustainability of the LC³ cements. Mortars were made of cements with different levels of clinker replacement by mineral additions. The results indicate the technical viability of the good performance obtained by the LC³ cement, capable of replacing up to 45% of the clinker quantity, with substitution ratios of 2: 1 and 3: 1 (calcined clay: limestone.
DOI: 10.6084/m9.figshare.12094968.v1
title: Influence of Fabrication Parameters on the Physical and Mechanical Properties of Medium Density Particleboards

description: ABSTRACT This research aims to evaluate the influence of three production factors (nominal density, temperature and pressure) on the production of medium density particleboard of Eucalyptus saligna wood with urea formaldehyde resin and catalysts and to verify if the panels meet the normative requirement of ABNT NBR 14810. The influence of factors on MDP panels were analyzed through 12 experimental treatments. A total of 48 sheets were manufactured, with 4 sheets with dimensions 300 mm x 300 mm x 15 mm, determining 7 physical and mechanical properties, totaling 336 experimental determinations. The following properties were evaluated: moisture content, apparent density, thickness swelling after 2h and 24h, perpendicular tensile, elastic modulus and resistance modulus. The treatments largely met normative requirements, with three treatments fully meeting. For most properties the factors of production were not statistically significant, allowing some factor to be reduced in order to maintain the same performance meeting the normative requirements.
DOI: 10.6084/m9.figshare.12094968
title: Influence of Fabrication Parameters on the Physical and Mechanical Properties of Medium Density Particleboards

description: ABSTRACT This research aims to evaluate the influence of three production factors (nominal density, temperature and pressure) on the production of medium density particleboard of Eucalyptus saligna wood with urea formaldehyde resin and catalysts and to verify if the panels meet the normative requirement of ABNT NBR 14810. The influence of factors on MDP panels were analyzed through 12 experimental treatments. A total of 48 sheets were manufactured, with 4 sheets with dimensions 300 mm x 300 mm x 15 mm, determining 7 physical and mechanical properties, totaling 336 experimental determinations. The following properties were evaluated: moisture content, apparent density, thickness swelling after 2h and 24h, perpendicular tensile, elastic modulus and resistance modulus. The treatments largely met normative requirements, with three treatments fully meeting. For most properties the factors of production were not statistically significant, allowing some factor to be reduced in order to maintain the same performance meeting the normative requirements.
DOI: 10.6084/m9.figshare.12094980
title: Influence of concretes compressive strength on superficial wettability

description: ABSTRACT Concrete surfaces are one of the substrates on which the mortar coating, widely used in buildings, can be applied. Frequently, when there are incompatibilities between the substrate and the mortar, the coating system’s durability can be compromised, causing pathological manifestations such as detachments and displacements. To reach a better mortar coating adhesion and adherence, would be ideal that the substrate presents a hydrophilic surface, which allows a greater coating spreading. In this context, the present research aims to evaluate the superficial wettability of concretes with different compressive strength, in order to infer the performance from the point of view of adherence of a mortar coating layer on these substrates. Five concretes were dosed with different proportions and water/binder ratios, resulting in different values of compressive strength at 28 days. Concrete characterization in terms of compressive strength was done according to ABNT NBR 5739:2007, and water absorption by capillarity according to ABNT NBR 9779:2012. The concretes surface wetness test was evaluated through a sessile drop profile capture equipment. It was identified that the concretes compressive strenght has an influence on the wettability of its surfaces. Concretes with higher compressive strength have, beyond a lower absorption, a lower wettability. The mortar coating applied on a concrete substrate with higher compressive strength and lower capillary porosity can result in a lower mortar paste absorption by substrate pores and a lower contact extension, hampering the development of the mechanical interlocking and the adherence between the materials.