Experimental study of the performance of basalt fiber shotcrete under heat damage
Zhou Ping , Wang Zhijie , Yang Yue , Ji Xiaofeng
DOI:
Received October 21, 2015,Revised , Accepted , Available online May 10, 2016
Volume ,2016,Pages 69-76
- Abstract
We studied the effect of different amount of basalt fiber on the splitting strength, bond strength and other mechanical properties of shotcrete under the context of tunnel heat-harm by using a combined method of model test, approximate simulation wet shotcrete technique, quantitative analysis and microscopic testing. Then we compared mechanical properties of shotcrete with different amount of basalt fiber both under standard curing and dry heating curing, and added silica fume and steel fiber into shotcrete to find an effective way to solve heat-harm. The results show that the basalt fiber added to the shotcrete can increase the strength of the shotcrete and resist cracks, which improves the fragility of shotcrete. Moreover, in dry and hot environment, a small amount of basalt fiber added can improve the mechanical properties of shotcrete. When the mixing amount of basalt consists of 0.1 percent basalt fiber and 5 percent silica fume, the mechanical properties of shotcrete is the best, and 0.2 percent basalt fiber added can also improve to a certain degree. In practice, adding moderate amount of basalt fiber and silica fume into shotcrete can reduce the damage of concrete under heat-harm.