Influence of different mixing methods on the axial compressive strength of basalt fiber recycled concrete

摘要

Fiber reinforced concrete as a kind of complex material of composite reinforced, which has received wide attention in the material field and engineering. In this experiment, the volume of basalt fiber were 0,0.1%, 0.15%, 0.20%, in this cases of, two kinds of different ways of curing fiber influenced axial compressive strength of basalt fiber recycled concrete blocks that were cured through normal temperature and high temperature. The concrete blocks have two types, the first one was maintained 7d, the second one was maintained 28d at normal temperature. The high temperature included 200°C, 400°C, 600°C,. Experimental results show that axial compressive strength of the cement paste wrapped fiber was superior to that mode of which fiber is added directly, but with the change of the fiber content, curing time and temperature, compared with the direct incorporation, the range of which indirect incorporation improved the strength was different from it. Along with the increase of fiber volume, the difference of the two kinds of incorporation mode increased more, and the gap increased with the increase of temperature firstly and then decreased when the fiber content reached the maximum of 0.20%. The way of cement paste wrapped fiber which increased early strength more than that of 28d. Finally, the range of which indirect incorporation improved the strength reached the maximum when fiber volume content was 0.2% and temperature was 400°C.