Effect of Curing Temperature on Activity Index of Silica Fume

4th Annual International Workshop on Materials Science and Engineering

Dai, Jinpeng^1,2 ; Wang, Qicai^1,2 ; Xie, Chao^1,2 ; Xie, Zhigang^1,2 ; Tian, Xianfu^2 ; Lou, Xuyu^1 ; Guo, Haizhen^2

Rd. and Bridge Engineering Disaster Prevention and Control Technology, National Local Joint Engineering Laboratory, Lanzhou Jiaotong University, Lanzhou, China^1

Gansu Provincial Highway Bridge and Underground Engineering Key Laboratory, Lanzhou Jiaotong University, Lanzhou, China^2

关键词: Activity index;    Curing age;    Curing temperature;    Different ages;    Mercury porosimetry;    Mortar specimens;    Relative activities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012096/pdf
DOI  :  10.1088/1757-899X/381/1/012096

来源: IOP

【 摘 要 】

The compressive strength of the contrast mortars and test mortars at different curing temperatures at different ages were tested. Effect of curing temperature on the strength of the test mortars and the contrast mortars was analyzed. The relative activity index and absolute activity index of the silica fume were studied. The mercury porosimetry method was used to test the pore structure of mortar specimens, and the improving effect of silica fume on the pore structure of mortar specimens under different curing temperatures was analyzed. The results show that with the increase of age, the decrease of curing temperature will cause the strength of mortar specimens to slow down. At the 3d and 7d ages, with the decrease of curing temperature, the absolute activity value of silica fume gradually increases. After 7 days of age, with the decrease of curing temperature, the absolute activity of silica fume gradually decreases. With the increase of curing age, the relative activity of silica fume decreases at first and then increases at 20°C and 10°C. The relative activity value of silica fume under the maintenance of 5°C and -3°C increased first and then decreased gradually. The addition of silica fume in the concrete improved the internal pore structure of the specimen, and the effect of curing temperature on the specimen was consistent.