用再生细骨料制备再生骨料纤维水泥基复合材料(recycled fine aggregates-fiber-reinforced cementitious composites,RFA-FRCC),研究再生细骨料替代率、水胶比和聚乙烯醇(PVA)纤维体积掺量3个因素对RFA-FRCC抗压强度和抗折强度的影响;基于Box-Behnken响应面法对3个因素进行回归分析,优化RFA-FRCC配合比设计,提出系统化的RFA-FRCC配合比设计方法.结果表明:再生细骨料替代率对RFA-FRCC的强度影响最大,水胶比的影响次之,PVA纤维体积掺量的影响最小;当再生细骨料替代率为50%、水胶比为0.284、PVA纤维体积掺量为2.5%时,试件具有最佳的力学性能.微观分析结果表明,再生细骨料的存在并未改变纤维和水泥基体黏结界面的性质.
Mix Ratio Optimization and Performance of Fiber-Reinforced Cement-Based Composites Prepared with Recycled Aggregates
Recycled fine aggregates-fiber-reinforced cementitious composites(RFA-FRCC)were prepared with recycled fine aggregates,and the replacement rate of recycled fine aggregates,water-binder ratio and polyvinyl alcohol(PVA)fiber blending ratio were studied.Influence of three factors on the compressive strength and flexural strength of RFA-FRCC was measured;regression analysis on the three factors based on Box-Behnken response surface method was conducted;design of RFA-FRCC mix ratio was optimize;a systematic RFA-FRCC mix ratio design method was proposed.The results showed that the replacement rate of recycled fine aggregates had the greatest impact on RFA-FRCC strength,followed by the water-binder ratio and PVA fiber blending ratio;when the replacement rate of recycled fine aggregates was 50%,the water-binder ratio was 0.284;when the PVA fiber volume content was 2.5%,the sample had the best mechanical properties.The results of microscopic analysis showed that the presence of recycled fine aggre-gates did not change the properties of the bonding interface between fibers and cement matrix.
fiber-reinforced cementitious compositesrecycled fine aggregatesBox-Behnken response sur-face methodmix ratiomicrostructure
万方数据
维普
