大流动性再生粗集料混凝土配合比设计方法_侯永利.pdf

1大流动性再生粗集料混凝土配合比设计方法 1,2 1 3 侯永利 ，郑刚 ，梁青 （1.天津大学建筑工程学院，天津 300072 ；2. 内蒙古工业大学土木工程学院，内蒙古 呼和浩特 010051； 3. 内蒙古蒙建建筑安装工程有限责任公司，内蒙古 呼和浩特 010020 ） 摘 要：采用相同砂浆体积法 （EMV 方法）配制再生混凝土，可节省水泥及细集料的用量，其强度及弹性 模量与对比天然集料混凝土相近，但由于新拌砂浆含量少而流动性能变差。本文给出了EMV 法的改进方法 及具体设计步骤，并应用该改进方法与传统骨料替代方法，选用两种不同来源的再生粗集料配制再生混凝 土，分别测定各组混凝土塌落度、干湿表观密度、立方体抗压强度、劈裂抗拉强度、轴心抗压强度，以及 弹性模量等指标。试验结果表明，采用改进EMV 方法可配制出大流动性再生混凝土，而且其它各项指标均 接近对比天然集料混凝土。 关键词：再生骨料混凝土；大流动性；配合比；强度；弹性模量 中图分类号：TU528 文献标志码：A 文章编号： 2015-03-24 13:33 /kcms/detail/31.1764.TU1333.007.html 网络出版时间： 网络出版地址： Mixture Proportioning Method for High Flowing Recycled Aggregate Concrete Abstract ：Recycled aggregate concrete (RAC) mixing with equal mortar volume (EMV) method is obtained less cement and fine aggregate content and has the similar strength and elastic modulus to a companion mix made with only natural aggregate. But the slump reduced because of the lower new mortar volume. This paper has presented the improved EMV method and the detailed steps of design. Using the improved method and the conventional aggregate replacement method, a large number of mixes was made with recycled coarse aggregate obtained from two different origins. For each mix, its slump, fresh and hardened densities, compressive strength, splitting tensile strength, axial compressive strength and elastic modulus were measured. The results showed that using the improved EMV method, the high flowing recycled aggregate concrete possessing the other similar properties with companion natural aggregate concrete can be mixed. Keywords: recycled aggregate concrete; high flowing; mixing proportion; strength; elastic modulus 再生混凝土是指利用废混凝土破碎加工而成的再生集料，部分或全部代替天然集料配 制而成的混凝土，其应用有利于减少资源消耗、节省土地占用，实现可持续发展。通常配 收稿日