废旧砖在GRC中的再生利用研究

Research on recycling use of waste brick in GRC

采用正交设计方法研究了粉煤灰及再生砖骨料对GRC的影响,并进一步研究了再生砖骨料的取代率对再生骨料GRC的影响及变化规律。结果表明,再生骨料GRC的强度随废砖取代率的提高呈增长趋势,当粉煤灰取代普通水泥20%,耐碱玻纤体积率1.5%,废旧砖取代天然砂35%～45%时,可达到或超过天然砂GRC的力学性能;其中再生骨料取代天然砂体积率为45%时,再生骨料GRC的抗折和抗压强度最大,7 d与28 d抗折强度分别可增长38.5%和38.3%,抗压强度分别可增长25.3%和9.1%。

In the paper, by using the orthogonal design method,the effects of fly ash and waste brick aggregate on GRC was researched,the effects of replacement ratio of waste brick aggregate on the recycled aggregate GRC was further researched. The re- suits show that the strength of recycled aggregate GRC improves with the increase of the replacement ratio of waste brick aggre- gate. When the replacement ratio of fly ash to P·O cement was 20%,alkali-resistant glass fiber volume ratio was 1.5% and waste brick to natural sand was 35%-45%,the mechanical properties can reach or exceed to the one of GRC with natural sand;and when the volume replacement ratio reached to 45%,the performance of GRC is optimal, the 7 d and 28 d tensile strength can in- crease 38.5% and 35.3% respectively and the compressive strength can increase 25.3% and 9.1% respectively.