Experimental investigation and modelling of the temperature effects on the tensile behavior of textile reinforced refractory concretes

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• 作者：Dimas Alan Strauss Rambo^a ; Yiming Yao^b ; Flá ; vio de Andrade Silva^c ; ^{fsilva@puc-rio.br} ; Romildo Dias Toledo Filho^a ; Barzin Mobasher^b
• 关键词：Mechanical properties ; Elevated temperatures ; Textile reinforced refractory concrete ; Basalt fiber ; Finite difference model ; Digital image correlation
• 刊名：Cement and Concrete Composites
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：75
• 期：Complete
• 页码：51-61
• 全文大小：3440 K
• 卷排序：75

文摘

The work in hand presents results of an experimental and numerical research on the post-heating residual strength of a basalt textile refractory composite submitted to tensile loading. The tensile tests were performed after a preheating process at temperatures ranging from 25 to 1000 °C. The mechanical performance and cracking mechanisms were discussed and compared to that obtained at room temperature. Image analysis by means of digital image correlation method was used to obtain the evolution of crack width which was subsequently correlated with the stress response for all target temperatures. Scanning electron microscopy was used to investigate the damage processes in the fiber–matrix interfaces after exposure to high temperatures. A finite difference model was used to simulate the tension stiffening behavior of TRC (Textile Reinforced Concrete) systems predicting their crack spacing and stress vs. strain responses. The obtained results indicated that due to the coating decomposition the reliability of basalt TRC can only be guaranteed from room temperature to 150 °C.