Comportamento do concreto sob altas temperaturas via planejamento experimental fatorial com configuração estrela

Souza, Leovegildo Douglas Pereira de; Azeredo, Givanildo; Silva, Flávio de Andrade

doi:10.1590/s1678-86212018000100224

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…Bailey and Toh [10] tested forty-eight horizontally unrestrained two-way spanning reinforced concrete slabs at ambient and elevated temperatures comparing the modes of failure observed in each case in order to provide a wealth of data, which can be used to further develop simple design methods. Souza et al [11] presented the use of the factorial experimental design methodology with a star configuration for the study of the compressive strength of specimens heated in kilns. Dias et al [12] studied the concrete subjected to high temperatures and concluded that in this situation the material undergoes significant deterioration as a reduction in the modulus of elasticity and resistance to compression, surface displacement and loss of durability.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of mechanical damage on concrete under high temperatures

Assis

Sasso

Farage

et al. 2022

Rev. IBRACON Estrut. Mater.

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Concrete is a widespread material all over the world. Due to this material’s heterogeneity and structural complexity, predicting the behavior of concrete structures under extreme environmental conditions is a very challenging task. High temperatures lead to microstructural changes which affect the macrostructural performance. In this context, computational tools that allow the simulation of structures may assist the analysis, by reproducing varied situations of thermal and mechanical loading and boundary conditions. In order to contribute to this scenario, this study proposes a numerical methodology to simulate the thermomechanical behavior of concrete under temperature gradients, through inverse analyses and a user subroutine implemented in Abaqus software. Thermal loading effects were considered as loading data for a damage model. Experimental data available in the literature was adopted for adjustment and validation purposes. The preliminary results presented herein encourage further improvements so as to allow realistic simulations of such an important aspect of concrete’s behavior.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of mechanical damage on concrete under high temperatures

Assis

Sasso

Farage

et al. 2022

Rev. IBRACON Estrut. Mater.

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show abstract

“…Na área da construção civil o planejamento fatorial foi utilizado, por exemplo, por Souza et al (2018) para analisar o comportamento do concreto sob altas temperaturas. Além disso, diversos trabalhos (SHI et al, 2015;PARGHI;ALAM, 2016;KRISHNAN;PURUSHOTHAMAN, 2017;KABAGIRE;YAHIA, 2017MENG et al, 2018 relataram o uso promissor desta ferramenta na indústria da construção civil.…”

Section: Introductionunclassified

Condições Ótimas Para a Incorporação De Resíduo De Fresado Asfáltico Em Concreto De Alta Resistência via Planejamento Fatorial

Martins¹,

Silva²,

Jacintho³

2019

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RESUMOCom o advento do crescimento urbano e o esgotamento de recursos naturais, tornase necessária uma maior atenção às ações que visam diminuir o impacto ambiental causado pela indústria da construção civil. Assim, realizar estudos que visam o desenvolvimento de construções mais sustentáveis é fundamental para diminuir o uso de insumos, além de definir um destino correto para os resíduos gerados na construção civil. Neste contexto, o presente trabalho teve por objetivo investigar o uso de resíduo de fresado asfáltico em concretos de alta resistência, como substituto aos agregados naturais (miúdo e graúdo). Para determinar as condições ótimas para a incorporação deste resíduo, um Delineamento Composto Central Rotacional com 11 ensaios foi utilizado. A qualidade do concreto foi analisada por testes de resistência à compressão axial. Os resultados indicaram um traço otimizado, em relação a máxima incorporação do resíduo (7,5% de substituição na fase graúda e 22,5% na fase miúda), com uma resistência à compressão média (28 dias) de 50,85 MPa, sendo apenas 3,71% inferior ao traço referência (52,81 MPa). Dessa forma, estes resultados demonstraram a viabilidade técnica em inserir o resíduo de fresado asfáltico em substituição parcial aos agregados naturais para concretos estruturais de alta resistência. Ademais, os resultados deste trabalho mostraram a eficiência na utilização da metodologia do planejamento experimental fatorial na área da construção civil. PALAVRAS-CHAVE: concreto, planejamento fatorial, resíduo de fresado asfáltico. ABSTRACTActions aimed at reducing the environmental impact caused by the construction industry are essential in a World with decreasing natural resources and high urban growth rate. The design of sustainable buildings is fundamental to reduce the use of raw materials and to set the correct destination of waste generated in construction. In this context, the objective of this work was to investigate the potential use of reclaimed asphalt pavement (RAP) instead of natural aggregates in high strength concrete. A Central Composite Rotatable Design with 11 experiments was used to establish the optimum conditions to incorporate reclaimed asphalt pavement in concrete. Mechanical properties were analyzed by axial compressive strength tests. Optimal conditions related to the maximum incorporation of residue (7.5% of substitution of large aggregate and 22.5% of fine aggregate) were achieved with an axial compressive strength (28 days) of 50.85 MPa, only 3.71% lower than the reference concrete (52.81 MPa). Therefore, the results demonstrate the technical feasibility replacing part of natural aggregates for reclaimed asphalt pavement in high strength concrete. In addition, the results of this work showed the efficiency on use the factorial design to determine the optimum conditions for the incorporation of reclaimed asphalt pavement in high strength concrete.

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Comportamento do concreto sob altas temperaturas via planejamento experimental fatorial com configuração estrela

Cited by 2 publications

References 22 publications

Numerical analysis of mechanical damage on concrete under high temperatures

Numerical analysis of mechanical damage on concrete under high temperatures

Condições Ótimas Para a Incorporação De Resíduo De Fresado Asfáltico Em Concreto De Alta Resistência via Planejamento Fatorial

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