大流动性再生粗集料混凝土配合比设计方法

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发布时间：2021-09-09

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大流动性再生粗集料混凝土配合比设计方法
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(EMV)方法配制再生粗集料混凝土，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(NAC)相近，但由于新拌砂浆含量小而使其流动性能变差．
给出了EMV方法的改进方法及具体设计步骤，并应用该改进方法配制2种不同来源再生粗集料
的大流动性再生粗集料混凝土(FRAC)，测定其坍落度、干湿表观密度、立方体抗压强度、轴心抗压
强度、劈裂抗拉强度以及弹性模量．结果表明：采用改进EMV 方法可配制出满足和易性要求的
FRAC，而且与传统方法配制的FRAC相比，其各项性能指标更接近对比NAC．
关键词：再生粗集料混凝土；大流动性；配合比；强度；弹性模量
中图分类号：TU528．041 文献标志码：A doi：10．3969／j．issn．1007-9629．2O16．02．026
Design of M ix Proportion for High Flowing Recycled Coarse Aggregate Concrete
HOU Yongli ， ZHENG Gang ， LIANG Qing。
(1．School of Civil Engineering，Tianjin University，Tianjin 300072，China；
2．College of Civil Engineering，Inner M ongolia University of Technology，Hohhot 010051，China
3．Inner Mongolia Mengjian Construction Installation Co．，Ltd．，Hohhot 010020，China)
Abstract：Recycled aggregate concrete was prepared by using equal mortar volume(EM V) method． The
advantage of the method lies in fact that the cement and fine aggregate can de saved，keeping the strength
and elastic modulus approximately equal to those of the concrete of natural aggregate．However，the slump
reduced due to the lower new mortar volume．The improved EMV method and the detailed steps of design
were proposed． Using the improved method， two kinds of high flowing recycled aggregate concrete
(FRAC) were prepared with recycled coarse aggregate obtained from two different origins respectively．
For each case，the indicators such as slump，fresh and hardened densities，compressive strength，axial
compressive strength，splitting tensile strength and elastic modulus were measured．The results show that
the FRAC meets the requirement of workability and other properties are similar to control natural aggre—
gate concrete(NAC)，better than the FRAC mixed with conventional aggregate replacement method．
Key words：recycled coarse aggregate concrete；high flowing；mix proportion；strength；elastic modulus
再生混凝土由废混凝土破碎加工成的再生集料
部分或全部代替天然集料配制而成，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
常配制再生混凝土是将再生集料看成匀质材料，按
照普通混凝土配制方法，将再生集料按一定比例等
体积或等质量替代天然集料．然而，再生集料是由天
然集料及其表面附着的砂浆构成，简单替代天然集
料将使再生混凝土中砂浆总体积偏大，导致弹性模