不同取代率再生粗骨料自密实混凝土的抗冻性能试验

Experimental study on the freeze-thaw resistance of recycled coarse aggregate self-compact concrete with different replacement ratios

对再生粗骨料取代率为0、25%、50%、75%、100%的再生粗骨料自密实混凝土进行了抗冻试验,并对不同冻融循环次数下试件的外观形态、质量损失率、相对动弹性模量和抗压强度损失率进行了对比分析。试验结果表明:经过冻融循环后,再生粗骨料自密实混凝土的抗压强度随着再生粗骨料使用量的增加而降低;冻融循环次数和再生骨料取代率对再生粗骨料自密实混凝土的抗冻性影响较大。

The frost resistance test of recycled coarse aggregate self compacting concrete,whose replacement rates are 0,25%,50%,75%and 100%respectively is carried out.According on the result of different freeze-thaw cycles experiments,the appearance,mass loss rate,relative dynamic modulus of elasticity and compressive strength loss rate of the specimens are analyzed.The test results show that after freeze-thaw cycles,the compressive strength of recycled coarse aggregate self-compacting concrete decreases with the increase in the amount of recycled coarse aggregate.The number of freeze-thaw cycles and the replacement rate of recycled aggregates have great impact on the frost resistance of dense concrete.