油菜秸秆纤维混凝土保温性能试验研究

(目的)为了将解决农业废弃物油菜秸秆的去向问题和新型墙材的研发结合起来,(方法)本文对油菜秸秆进行碱处理后,以砂率和不同比例的秸秆掺量为变量,制成300mm×300mm×30mm的试件,通过稳态平板导热仪测试其导热系数,使用电镜(SEM)扫描混凝土内部微观结构,从宏观和微观角度研究油菜秸秆纤维混凝土的保温性能。试验结果表明：(结果)不同秸秆掺量的各试验组及对照组,砂率为25%的混凝土相较于砂率取40%的混凝土导热系数均降低了约10%,(结论)即总体呈现砂率越高导热系数越大试件保温性能越差的趋势；(结果)不同砂率的各试验组及对照组,秸秆纤维掺量为2.5%的混凝土试件比秸秆纤维掺量为0%的混凝土试件的导热系数均降低了30%左右,(结论)即秸秆掺量越大,导热系数越小,试件保温性越好。

The Experimental Research on Thermal Insulation Properties of Rape Straw Fiber Concrete

To solve the problem of agricultural waste rape stalks and develop new wall materials, we treated the rape straws with alkaline and used the proportion of the sand rate and rape straws as the variable to make test pieces with size of 300 mm× 300 mm× 30 mm, then, we tested their thermal conductivity by a steady-state flatpanel thermal conductivity meter from the macroscopic perspective, and scanned the microstructure inside the concrete by a SEM, in order to study the thermal insulation performance of the rape straw fiber reinforced concrete from the microscopic perspective. The results showed that for each test group and control group with different straw contents, the thermal conductivity of concrete with 25% sand ratio was 10% lower than that with 40% sand ratio, generally speaking, the higher the sand rate, the higher the heat conductivity, and the larger the coefficient, the worse the insulation performance. For test group and control group with different sand rates, the thermal conductivity coefficient of concrete specimens with 2.5% straw content was about 30% lower than that with 0% straw content, that is, the greater the straw amount, the smaller the thermal conductivity, and the better the insulation performance.