华南理工大学学报(自然科学版) ›› 2014, Vol. 42 ›› Issue (2): 50-56.doi: 10.3969/j.issn.1000-565X.2014.02.009

• 土木建筑工程 • 上一篇    下一篇

废弃混凝土掺合型再生混凝土的力学性能

朱慈勉 李坛   

  1. 同济大学 土木工程学院,上海 200092
  • 收稿日期:2013-07-04 修回日期:2013-10-13 出版日期:2014-02-25 发布日期:2014-01-02
  • 通信作者: 朱慈勉(1947-),男,教授,博士生导师,主要从事结构分析和再生混凝土结构研究. E-mail:zcm@tongji.edu.cn
  • 作者简介:朱慈勉(1947-),男,教授,博士生导师,主要从事结构分析和再生混凝土结构研究.
  • 基金资助:

    国家科技支撑计划项目(2008BAK48B00)

Mechanical Properties of Waste Concrete- Participated Recycled Concrete

Zhu Ci- mian Li Tan   

  1. College of Civil Engineering,Tongji University,Shanghai 200092,China
  • Received:2013-07-04 Revised:2013-10-13 Online:2014-02-25 Published:2014-01-02
  • Contact: 朱慈勉(1947-),男,教授,博士生导师,主要从事结构分析和再生混凝土结构研究. E-mail:zcm@tongji.edu.cn
  • About author:朱慈勉(1947-),男,教授,博士生导师,主要从事结构分析和再生混凝土结构研究.
  • Supported by:

    国家科技支撑计划项目(2008BAK48B00)

摘要: 针对当前再生混凝土工程应用所面临的再生骨料生产成本高昂和废弃混凝土利用率偏低的问题,提出将废弃混凝土经适当破碎和湿水后直接与新拌混凝土混合拌制工程用混凝土,制得一种新型的再生混凝土材料——废弃混凝土掺合型再生混凝土.拌制该再生混凝土所用废弃混凝土块的最大粒径可达 50 ~80 mm,扩大了废弃混凝土在降低生产成本方面的优势,同时提高了废弃混凝土的利用率.对 150、 300 mm 模数废弃混凝土掺合型再生混凝土试件以及废弃混凝土掺合型再生混凝土板的力学性能进行了研究.结果表明: 废弃混凝土掺合型再生混凝土具有良好的力学性能,即使在废料掺量达到 30% ~40%时,其抗压强度、 抗拉强度和弹性模量仍很接近相应强度等级的普通混凝土; 废弃混凝土掺合型再生混凝土板的冲切承载力及破坏特征与普通混凝土板相近.

关键词: 废弃混凝土, 废弃混凝土掺合型再生混凝土, 抗压强度, 抗拉强度, 弹性模量, 冲切承载力

Abstract:

In order to reduce the production cost of recycled aggregate and improve the utilization rate of waste con-crete in common engineering application of recycled concrete,a new type of recycled concrete material named wasteconcrete- participated recycled concrete was prepared by straightly blending wet and broken waste concrete blockwith fresh concrete. The maximum size of waste concrete block for blending is up to 50 ~80mm,which may expandthe superiority of waste concrete in reducing the production cost and improving its utilization rate.Then,mechani-cal behavior studies were conducted for the 150 or 300mm module specimens and the slabs of waste concrete- partici-pated recycled concrete. The results show that,even when the participation rate of waste concrete reaches 30% ~40%,the compressive strength,tensile strength and elastic modulus of the prepared recycled concrete are veryclose to those of common concrete in the same strength grade,which means that the recycled concrete possessesideal mechanical properties. Moreover,it is also found that both the punching bearing capacity and the failure cha-racteristics of the recycled concrete slabs are very close to those of common concrete slabs.

Key words: waste concrete, waste concrete- participated recycled concrete, compressive strength, tensile strength, elastic modulus, punching bearing capacity

中图分类号: