cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14321972.v1
title: Analysis of the physical-mechanical properties of coating mortars with the incorporation of polypropylene and nylon fibers

description: ABSTRACT The search for new mixtures and materials that will improve the properties of coating mortars and consequently their performance in service is becoming more and more frequent, thus synthetic fibres appear as a possibility for a new material to be used in the composition of mixtures. The study aims at analyzing the behavior of coating mortars with the incorporation of different contents of polypropylene and nylon fibers. The experimental program was based on the incorporation of 500, 900 and 1300 g/m³ of polypropylene and nylon fibers in a reference mortar with a trace of 1:0.5:5 (cement:lime:sand). As a parameter, the amount of water used in all mortars produced was fixed and a plasticizer additive was added when necessary. Thus, this work aimed to analyze the influence of the incorporation of different contents of polypropylene and nylon fibers on the physical characteristics and mechanical properties of mortars in their hardened state. For this purpose, analyses of tensile strength in bending, compression strength, modulus of elasticity, dynamic and static, capillary water absorption and analysis of characteristics by scanning electron microscopy were performed. The results indicate that the mortars with incorporation of nylon fibers presented higher values of tensile strength in bending, axial compression and lower values of water absorption by capillarity. The analysis of the images obtained by the microscopy of the mortars showed that the mortars with polypropylene insertion showed greater porosity than the mortars with nylon addition. The mortars incorporating polypropylene fibers showed lower values of dynamic and static modulus of elasticity, which indicates that these mortars have a good capacity to suffer deformation.
DOI: 10.6084/m9.figshare.14321975.v1
title: Mechanical and damage similarities of adobe blocks reinforced with natural and industrial fibres

description: ABSTRACT Adobe is an earthen-based material that consists of the use of a clayey soil and, most of the times, straw fibres to manufacture blocks that are afterwards sundried. This study reviews the use of three types of fibres: vegetal, industrial and animal, for the manufacture of adobe blocks. Overall, all the fibres increase at least one order of magnitude the impact strength of plain adobe blocks and reduced the shrinkage cracking of adobe plasters in at least 50% with respect to plain adobe. Compressive and flexural strength average values were not increased nor decreased by the addition of fibres. The intrinsic variability of the mechanical properties of plain adobe persists with any of the fibres tested in this study. Based on the findings of this study, we recommend using jute fibres with a dosage of 0.5% and a length of 30 mm.
DOI: 10.6084/m9.figshare.14321975
title: Mechanical and damage similarities of adobe blocks reinforced with natural and industrial fibres

description: ABSTRACT Adobe is an earthen-based material that consists of the use of a clayey soil and, most of the times, straw fibres to manufacture blocks that are afterwards sundried. This study reviews the use of three types of fibres: vegetal, industrial and animal, for the manufacture of adobe blocks. Overall, all the fibres increase at least one order of magnitude the impact strength of plain adobe blocks and reduced the shrinkage cracking of adobe plasters in at least 50% with respect to plain adobe. Compressive and flexural strength average values were not increased nor decreased by the addition of fibres. The intrinsic variability of the mechanical properties of plain adobe persists with any of the fibres tested in this study. Based on the findings of this study, we recommend using jute fibres with a dosage of 0.5% and a length of 30 mm.
DOI: 10.6084/m9.figshare.14321976.v1
title: Impact of the formulation of aggregate gradations on the mechanical and functional properties of dense asphalt mixes

description: ABSTRACT The main aim of this manuscript is to evaluate the impact of the formulation of aggregate gradations on the mechanical and functional properties of dense asphalt mixes, comprising methodologies so-called by trial, theoretical and controlled. The first is standardized by Brazilian official road departments for producing asphalt mixes, in which the goal is to fit formulated gradation curves into the thresholds of gradation bands. With regards to the theoretical method, also named rational, it comprises a discrete selection of particle diameters in sieving plants, allowing to control precisely the percent distribution of the grains, without the need to consider gradation bands, by using Füller-Talbot equations. The controlled method means an adjustment performed in that research, in which was proceeded the individual fractioning of the granular particles predicted to by trial formulation, however, maintaining the same sieve sequence and the percent distribution originally adopted. They were characterized and used granular particles provided by gneissic crushed massive rock located in the metropolitan region of Joinville/SC and bituminous binder 50/70 (0.1mm) penetration supplied by a refinery placed in Paulínia/SP. They were tested mechanical properties such as compacting ability with Compacting Shear Press, resistance to deleterious action of water in Duriez test at 18ºC and to rutting, while functional properties as macrotexture and surface run-off time were evaluated by sand path height and drainability tests. The results obtained indicate the theoretical method is more efficient than the others studied, due to have presented the best mechanical and functional indicators in all evaluated parameters, while the method by trial proved to be the worst technically, and should be replaced by a more scientific and accurate methodology in Brazil.
DOI: 10.6084/m9.figshare.14321976
title: Impact of the formulation of aggregate gradations on the mechanical and functional properties of dense asphalt mixes

description: ABSTRACT The main aim of this manuscript is to evaluate the impact of the formulation of aggregate gradations on the mechanical and functional properties of dense asphalt mixes, comprising methodologies so-called by trial, theoretical and controlled. The first is standardized by Brazilian official road departments for producing asphalt mixes, in which the goal is to fit formulated gradation curves into the thresholds of gradation bands. With regards to the theoretical method, also named rational, it comprises a discrete selection of particle diameters in sieving plants, allowing to control precisely the percent distribution of the grains, without the need to consider gradation bands, by using Füller-Talbot equations. The controlled method means an adjustment performed in that research, in which was proceeded the individual fractioning of the granular particles predicted to by trial formulation, however, maintaining the same sieve sequence and the percent distribution originally adopted. They were characterized and used granular particles provided by gneissic crushed massive rock located in the metropolitan region of Joinville/SC and bituminous binder 50/70 (0.1mm) penetration supplied by a refinery placed in Paulínia/SP. They were tested mechanical properties such as compacting ability with Compacting Shear Press, resistance to deleterious action of water in Duriez test at 18ºC and to rutting, while functional properties as macrotexture and surface run-off time were evaluated by sand path height and drainability tests. The results obtained indicate the theoretical method is more efficient than the others studied, due to have presented the best mechanical and functional indicators in all evaluated parameters, while the method by trial proved to be the worst technically, and should be replaced by a more scientific and accurate methodology in Brazil.
DOI: 10.6084/m9.figshare.14321978
title: Shear strength of timber joints for stud members for framing construction produced with juvenile eucalyptus wood

description: ABSTRACT In wood frame structures, the frame connection plays an important role to guarantee stability for those constructions that are naturally flexible when subjected to shear during wind or earthquake. This work aimed to evaluate the shear strength of timber joints for wood frame shear wall produced with young eucalyptus wood (less than 15 years old), considering that the planting of species of this genus are more abundant in the country. The types of connections chosen for this study were metal plate, self-tapping screw, and rectangular mortise and tenon. To achieve this objective, 7 to 10 years old Eucalyptus pellita wood (class C20) was used to produce the specimens. The experimental procedures were provided by in the standard revision project ABNT PN 02:126.10-001-4 (ABNT, 2017). The results indicated that the mortise and tenon are the most suitable for frame to frame connection of wood frame shear wall due to its higher shear resistance and stiffness when compared to the self-tapping screw connected in 90° angle and metal plate.
DOI: 10.6084/m9.figshare.14321978.v1
title: Shear strength of timber joints for stud members for framing construction produced with juvenile eucalyptus wood

description: ABSTRACT In wood frame structures, the frame connection plays an important role to guarantee stability for those constructions that are naturally flexible when subjected to shear during wind or earthquake. This work aimed to evaluate the shear strength of timber joints for wood frame shear wall produced with young eucalyptus wood (less than 15 years old), considering that the planting of species of this genus are more abundant in the country. The types of connections chosen for this study were metal plate, self-tapping screw, and rectangular mortise and tenon. To achieve this objective, 7 to 10 years old Eucalyptus pellita wood (class C20) was used to produce the specimens. The experimental procedures were provided by in the standard revision project ABNT PN 02:126.10-001-4 (ABNT, 2017). The results indicated that the mortise and tenon are the most suitable for frame to frame connection of wood frame shear wall due to its higher shear resistance and stiffness when compared to the self-tapping screw connected in 90° angle and metal plate.
DOI: 10.6084/m9.figshare.14321979
title: Comparison between deformation modulus of national concretes made with coarse aggregates from different mineralogical origins

description: ABSTRACT Knowing the concrete properties is crucial for a safe and efficient design, mainly in a scenario marked by the adoption of increasingly slender elements and increasingly large spans. When not experimentally determined, the static deformation modules of national concretes are estimated by the equations contained in ABNT NBR 6118. In 2014, such equations underwent significant changes. New coefficients were inserted and, in addition to the characteristic resistance to compression of the composite, the nature of the coarse aggregate came to be considered. However, it is worth discussing how representative the equations used and the coefficients attributed to each type of rock have been in practice. Added to this is the fact that the concrete deformation modules are influenced by numerous factors, the compressive strength of the material being only one of them. Starting from a set of experimental results, this work evaluated how the values of the initial tangent deformation modulus of concrete (Eci) have behaved with different coarse aggregates, from different regions in the country. The influence of the parameters water/cement (W/C) ratio, slump, density also have been investigated, as well as the affinity of the results obtained with the current 2014 version of NBR 6118, with some of its previous versions, and foreign codes were also investigated. As results, the two models obtained to estimate Eci as a function of the W/Cratio, slump, density and concrete compressive strength at 28 days showed precision between 70% and 90%. Among the properties addressed, the density (ρ) was the one that most influenced the Eci values. The other models obtained were more conservative than the normative models for concretes containing limestone. For granite/gneiss aggregates all the models were equivalent. For basalt, the normative models were more conservative than those found here.
DOI: 10.6084/m9.figshare.14321979.v1
title: Comparison between deformation modulus of national concretes made with coarse aggregates from different mineralogical origins

description: ABSTRACT Knowing the concrete properties is crucial for a safe and efficient design, mainly in a scenario marked by the adoption of increasingly slender elements and increasingly large spans. When not experimentally determined, the static deformation modules of national concretes are estimated by the equations contained in ABNT NBR 6118. In 2014, such equations underwent significant changes. New coefficients were inserted and, in addition to the characteristic resistance to compression of the composite, the nature of the coarse aggregate came to be considered. However, it is worth discussing how representative the equations used and the coefficients attributed to each type of rock have been in practice. Added to this is the fact that the concrete deformation modules are influenced by numerous factors, the compressive strength of the material being only one of them. Starting from a set of experimental results, this work evaluated how the values of the initial tangent deformation modulus of concrete (Eci) have behaved with different coarse aggregates, from different regions in the country. The influence of the parameters water/cement (W/C) ratio, slump, density also have been investigated, as well as the affinity of the results obtained with the current 2014 version of NBR 6118, with some of its previous versions, and foreign codes were also investigated. As results, the two models obtained to estimate Eci as a function of the W/Cratio, slump, density and concrete compressive strength at 28 days showed precision between 70% and 90%. Among the properties addressed, the density (ρ) was the one that most influenced the Eci values. The other models obtained were more conservative than the normative models for concretes containing limestone. For granite/gneiss aggregates all the models were equivalent. For basalt, the normative models were more conservative than those found here.
DOI: 10.6084/m9.figshare.14321981.v1
title: Evaluation of corrosion rate of 1040 carbon steel in soil by electrochemical frequency modulation (EFM)

description: ABSTRACT The instantaneous corrosion rate of 1040 carbon steel buried in soil was measured by electrochemical frequency modulation (EFM) and linear polarization resistance (LPR). The results were compared to each other and to the corrosion rate data obtained by the analysis of corrosion coupons exposed in field. The values of instantaneous corrosion rate found in the soil by EFM were 0.088 ± 0.008 mm / year, by LPR of 0.075 ± 0.005 mm / year. The corrosion rate values obtained by weight loss of corrosion coupons were 0.064 ± 0.016 mm / year. Thus, in the experimental conditions imposed it can be inferred that the results obtained by the EFM technique served to diagnose the performance of 1040 carbon steel subjected to a soil corrosion process.
DOI: 10.6084/m9.figshare.14321981
title: Evaluation of corrosion rate of 1040 carbon steel in soil by electrochemical frequency modulation (EFM)

description: ABSTRACT The instantaneous corrosion rate of 1040 carbon steel buried in soil was measured by electrochemical frequency modulation (EFM) and linear polarization resistance (LPR). The results were compared to each other and to the corrosion rate data obtained by the analysis of corrosion coupons exposed in field. The values of instantaneous corrosion rate found in the soil by EFM were 0.088 ± 0.008 mm / year, by LPR of 0.075 ± 0.005 mm / year. The corrosion rate values obtained by weight loss of corrosion coupons were 0.064 ± 0.016 mm / year. Thus, in the experimental conditions imposed it can be inferred that the results obtained by the EFM technique served to diagnose the performance of 1040 carbon steel subjected to a soil corrosion process.
DOI: 10.6084/m9.figshare.14321982
title: Viscoelastic study of fresh and aged hot-mix asphalt with sintered calcined clay aggregate

description: ABSTRACT The mechanical behavior of flexible pavement asphalt coatings, composed by bituminous binder, depends on several factors, among them: compaction process, temperature and loading application rate. Several reactions occur on the main constituents of these asphalt mixtures, so as oxidation, physical hardening and loss of volatiles. In the case of the asphalt binder, aging increases viscosity, associated to a decrease in the penetration and loss of its binding properties. In particular, the consistency achieved with the time leads to an increase of the stiffness. This paper aims to study the mechanical behavior of fresh and aged asphalt mixtures manufactured with Sinterized Calcined Clay Aggregate (SCCA) by four-point bending tests. The effect of the compaction process in the prismatic specimens modulus |E*| was determined, so as the influence of the asphalt binder aging. The results presented a drop of up to 81.1% in |E*| values under the selected series of temperatures and frequencies. The experimental data was analyzed by means of the Euler-Bernoulli Theory generalized for viscoelastic materials with 4PB representative dynamic loading. The theoretical modeling compatibility was pronounced for both searched compositions (fresh and aged), considering the curve fitting achieved, represented by the coefficients of determination (R²) that were acquired.
DOI: 10.6084/m9.figshare.14321982.v1
title: Viscoelastic study of fresh and aged hot-mix asphalt with sintered calcined clay aggregate

description: ABSTRACT The mechanical behavior of flexible pavement asphalt coatings, composed by bituminous binder, depends on several factors, among them: compaction process, temperature and loading application rate. Several reactions occur on the main constituents of these asphalt mixtures, so as oxidation, physical hardening and loss of volatiles. In the case of the asphalt binder, aging increases viscosity, associated to a decrease in the penetration and loss of its binding properties. In particular, the consistency achieved with the time leads to an increase of the stiffness. This paper aims to study the mechanical behavior of fresh and aged asphalt mixtures manufactured with Sinterized Calcined Clay Aggregate (SCCA) by four-point bending tests. The effect of the compaction process in the prismatic specimens modulus |E*| was determined, so as the influence of the asphalt binder aging. The results presented a drop of up to 81.1% in |E*| values under the selected series of temperatures and frequencies. The experimental data was analyzed by means of the Euler-Bernoulli Theory generalized for viscoelastic materials with 4PB representative dynamic loading. The theoretical modeling compatibility was pronounced for both searched compositions (fresh and aged), considering the curve fitting achieved, represented by the coefficients of determination (R²) that were acquired.
DOI: 10.6084/m9.figshare.14321985
title: Study of the properties of conventional concrete with additive or addition of water for consistency correction

description: ABSTRACT The fluidity and plasticity of the concrete should be maintained during the displacement to the work, preventing possible changes in the properties. When there are changes, they should be corrected with water or plasticizer additives. Therefore, this is paper aims to evaluate the properties of fluidity and characteristic resistance of concrete. For this, concrete scans were produced with fck equal to 25MPa and S50 consistency. The analysis of the results occurred from three performed experiments, one without the correction of the Slump Test, the second with consistency checks at times of 60, 120 and 150 minutes shortly after the preparation of the mixture. The third, the verification consists of concrete with the same checks as the second, but with the addition of the plasticizer additive. The results obtained indicate that in the reference stroke there was minimization of consistency in 64% over the 150 minutes. The mean compressive strength decreased over time, while water was added. Therefore, the characteristic resistance fell by 7.25% compared to concrete without the correction of the Slump. However, for concrete with additive, the average resistance increased by 16.52% during the 150 minutes. This refers to the fact that the use of additives in the percentages analyzed favors the gain of concrete resistance. On the other hand, when adding water the concrete loses resistance. Therefore, the use of water to correct fluidity is not ideal, since it alters the final resistance of the concrete.
DOI: 10.6084/m9.figshare.14321985.v1
title: Study of the properties of conventional concrete with additive or addition of water for consistency correction

description: ABSTRACT The fluidity and plasticity of the concrete should be maintained during the displacement to the work, preventing possible changes in the properties. When there are changes, they should be corrected with water or plasticizer additives. Therefore, this is paper aims to evaluate the properties of fluidity and characteristic resistance of concrete. For this, concrete scans were produced with fck equal to 25MPa and S50 consistency. The analysis of the results occurred from three performed experiments, one without the correction of the Slump Test, the second with consistency checks at times of 60, 120 and 150 minutes shortly after the preparation of the mixture. The third, the verification consists of concrete with the same checks as the second, but with the addition of the plasticizer additive. The results obtained indicate that in the reference stroke there was minimization of consistency in 64% over the 150 minutes. The mean compressive strength decreased over time, while water was added. Therefore, the characteristic resistance fell by 7.25% compared to concrete without the correction of the Slump. However, for concrete with additive, the average resistance increased by 16.52% during the 150 minutes. This refers to the fact that the use of additives in the percentages analyzed favors the gain of concrete resistance. On the other hand, when adding water the concrete loses resistance. Therefore, the use of water to correct fluidity is not ideal, since it alters the final resistance of the concrete.
DOI: 10.6084/m9.figshare.14321987.v1
title: Study of the influence of the replacement of Portland cement by red ceramic residue in the manufacture of fiber cement boards

description: ABSTRACT Currently, the waste of the red ceramic industry presented as a potential alternative for use in cementitious matrices such as mineral or pozzolan addition of low reactivity. This study had as objective evaluate the influence of partial replacement of CP V ARI cement by the red ceramic industrywaste on fiber cement plates. The cement was replaced to volume in the percentages of 0, 15, 25 and 50%. These combinations were reinforced with cellulose and polypropylene (PP) fibers. The investigation was perform tests including X-ray diffraction, scanning electron microscopy and thermogravimetric Analysis. Moreover, mechanical flexural strength tests of the boards were performed on samples produced based on a suction and pressing process. All test were performed with samples at 28 days of hydration. The results of the microstructural characterization showed a reduction of calcium hydroxide as the RCV content increases, due to the consumption of this compound as result of the pozzolanic reaction, C-S-H peaks were also observed in all mixtures. Considering the results of the flexural mechanical properties, all percentages of substitution presented satisfactory results in accordance with the NBR 15498 standard referring flexural strength for use on external facades.