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Studying the Mechanical Behavior and Strengthening of RCSACC after Exposure to Elevated Temperatures
Estudio del comportamiento mecánico y refuerzo del RCSACC tras su exposición a temperaturas elevadas
DOI:
https://doi.org/10.15446/ing.investig.105573Keywords:
mechanical properties, rapid calcium sulfoaluminate cement, copper-plated microfilament fibers, shear corrugated fibers, shrinkage (en)propiedades mecánicas, cemento de sulfoaluminato cálcico rápido, fibras de microfilamentos recubiertos de cobre, fibras onduladas de cizallamiento, contracción (es)
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Rapid calcium sulfoaluminate cement concrete (RCSACC) has received increased attention of late because it can be manufactured with less CO2 emissions than ordinary Portland cement. In previous studies, RCSACC performed poorly when subjected to elevated temperatures, to which fiber-reinforced concrete (FRC) is a potential alternative. This study investigated the impact of incorporating two types of fibers, i.e., copper-plated steel microfilament (CPM) and shear corrugated steel (SC), on the engineering, mechanical, and microstructural features of RCSACC after exposure to elevated temperatures. Pore size distribution, microstructure, and mechanical properties were tested after exposure to temperatures of 100, 200, and 300 °C. The content of each type of fibers represented 1% of the concrete. The results showed that the mechanical properties were affected by the addition of either type of steel fibers. Adding CPM or SC steel fibers could ensure an adequate resistance of RCSACC when exposed to high temperatures, in addition to improving its residual mechanical behavior, spalling resistance, and ductility after heating. Steel fibers contribute to enhancing both mechanical properties and resistance to heating effects. However, adding steel fibers also appears to increase microstructure damage with heat, reduce workability, entrap air and water, and reduce cracking related to drying shrinkage.
Últimamente, el hormigón de cemento sulfoaluminato de calcio rápido (RCSACC) ha recibido una mayor atención porque puede fabricarse con menos emisiones de CO2 que el cemento Portland ordinario. En estudios anteriores, el RCSACC presentó un mal desempeño cuando se sometió a temperaturas elevadas, para lo cual el hormigón reforzado con fibra (FRC) es una potencial alternativa. Este estudio investigó el impacto de la incorporación de dos tipos de fibras, i.e., microfilamento de acero chapado en cobre (CPM) y acero corrugado (SC), en las características de ingeniería, mecánicas y microestructurales del RCSACC tras su exposición a temperaturas elevadas. Se probaron la distribución del tamaño de los poros, la microestructura y las propiedades mecánicas tras la exposición a temperaturas de 100, 200 y 300 °C. El contenido de cada tipo de fibras representaba el 1 % del hormigón. Los resultados mostraron que las propiedades mecánicas se vieron afectadas por la adición de cualquiera de los dos tipos de fibras de acero. La adición de fibras de acero CPM o SC podría garantizar una resistencia adecuada del RCSACC cuando se expone a altas temperaturas, además de mejorar su comportamiento mecánico residual, su resistencia al desconchado y su ductilidad después del calentamiento. Las fibras de acero contribuyen a mejorar tanto las propiedades mecánicas como la resistencia a los efectos del calentamiento. Sin embargo, la adición de fibras de acero también parece aumentar el daño a la microestructura con el calor, reducir la trabajabilidad, atrapar el aire y el agua, y reducir el agrietamiento relacionado con la contracción por secado.
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Copyright (c) 2024 Jean Jacques Kouadjo Tchekwagep, Yiping Qui, Shifeng Huang, Shoude Wang, Xin Cheng
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