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为拓展废旧轮胎、再生骨料及天然浮石的应用范围,研究了在1∶1(再生骨料和天然浮石体积比为1∶1)混合骨料中外掺不同粒径(粒径20目、60目、80目、100目、120目)和不同掺量(掺量3%、6%、9%)的废旧橡胶粉,分析混合骨料混凝土的早期力学性能和微观结构。试验结果表明:在粒径相同的条件下,废旧橡胶粉使混合骨料混凝土的抗压强度降低率增大;掺量相同时,80目抗压强度下降率最大;从环境扫描电镜中得出,橡胶粉、再生骨料、浮石与水泥界面是薄弱区域,是造成混合骨料混凝土强度降低的主要原因。
In order to expand the application range of waste tires, recycled aggregates and natural pumice, the effects of adding different particle sizes (particle size 20 mesh, 60 mesh) on the mixed aggregate 1: 1 (regenerated aggregate to natural pumice volume ratio 1: 1) 80 mesh, 100 mesh, 120 mesh) and different content of rubber powder (3%, 6%, 9%) were used to analyze the early mechanical properties and microstructure of the mixed aggregate concrete. The results show that the compressive strength decrease rate of mixed aggregate concrete increases with the same rubber particle size and the largest decrease rate of compressive strength at 80 mesh is obtained when the same amount of rubber powder is used. From the environmental scanning electron microscope , Rubber powder, recycled aggregate, pumice and cement interface is a weak area, which is the main reason for the decrease of strength of concrete with mixed aggregate.