Research on compressive strength of recycled cement mortar after high temperature

1st International Conference on New Material and Chemical Industry

材料科学;化学工业

Zhang, Xianggang^1,2,3 ; Yang, Jianhui^1,2 ; Deng, Dapeng^1,2

Henan Polytechnic University, Henan Province Engineering Laboratory of Eco-architecture and the Built Environment, Jiaozuo

454000, China^1

Henan Polytechnic University, School of Civil Engineering, Jiaozuo

454000, China^2

Guangxi Key Lab of Road Structure and Materials, Nanning

530000, China^3

关键词: After high temperature;    Cement mortars;    Failure process;    Recycled cements;    Recycled fine aggregates;    Replacement rates;    Ultimate compressive strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/167/1/012055/pdf
DOI  :  10.1088/1757-899X/167/1/012055

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to study cube compressive strength of recycled fine aggregate cement mortar after different temperatures, with the affect parameters between replacement rate of recycled fine aggregate and temperature, 45 standard cube test blocks were designed and produced to carry out compressive strength test. The failure process and failure mode of test blocks were observed. Ultimate compressive strength of cube blocks were measured, the relations between cube compressive strength and the replacement rates of recycled fine aggregate under different temperatures as well as the relations between cube compressive strength and temperatures under different replacement rates were all analyzed, the influence change parameters made on cube compressive strength was discussed. The results showed: the failure process and the failure mode of recycled fine aggregate cement mortar and the failure process and the failure mode of nature is similar; when the temperature reached 400°C, the block has no burst phenomenon, but the colour of block into a dark pink; with the increase of recycled fine aggregate, the mass lose rate of block is increase; effect different temperature make on cube compressive strength of test block is not obvious when temperature keeps same for 3h.