复掺废砖再生混凝土的抗压强度

Compressive Strength of Mixed Waste Recycled Concrete

试验研究水灰比、砂率、粉煤灰替代率、硅灰掺量及废砖替代率5个因素对复掺废砖再生混凝土抗压强度的影响.结果表明:水灰比、砂率和粉煤灰替代率对复掺再生混凝土28 d抗压强度的影响都是先增大后减小;随着硅灰掺量的增加,再生混凝土28 d抗压强度依次增大;随着废砖替代率的提高,再生混凝土28 d抗压强度逐步减小;当其他组分掺量适当,废砖骨料替代率为100%时,可以配制满足C30强度要求的再生混凝土.

This test program focused on five factors that can make impact on the mixed waste recycled concrete： the water cement ratio,the sand ratio,the replacement ratio of fly ash,the silicon ash content and the waste brick replacement rate. The study shows that： the water cement ratio,the sand ratio and the replacement ratio of fly ash has impact on the 28 d mixed waste recycle concrete in a pattern of first increase and then decrease; The compressive strength of 28 d recycled concrete increases with the growth of the silicon ash content; The compressive strength of 28 d recycled concrete decreases with the growth of the waste brick replacement rate; With a proper portion of other components,when waste brick rate comes to 100%,C30 concrete could be configured.