再生细集料对水泥混凝土物理力学性能的影响  

Influence of Fine Recycled Aggregate on Physical and Mechanical Properties of Concrete

作　　者：孙家瑛[1,2] 车乘乘[2] 

机构地区：[1]浙江大学宁波理工学院绿色建材与废弃物资源化研究中心,宁波315100 [2]上海大学土木工程系,上海20072

出　　处：《土木建筑与环境工程》2011年第3期143-146,152,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：科技部国际合作重大项目(2010FA24590);国家自然科学基金(50808160)

摘　　要：废弃混凝土通过一系列再生工艺可以得到再生混凝土细集料,将其部分或全部替代天然砂配制混凝土可以达到变废为宝的目的,但是再生混凝土细集料特殊的性质会使得掺再生细集料的混凝土性能与普通混凝土之间存在较大的差异。在研究再生混凝土细集料的粒径和物理特性对水泥混凝土物理力学性能影响的基础上,探讨再生混凝土细集料对混凝土的抗气渗性能、抗氯离子渗透性能、抗碳化性能的影响。研究结果发现,再生细集料在破碎制备过程中产生了大量缺陷和粉料,采用一定量的再生细集料替代天然细集料配制混凝土,其物理力学性能、抗氯离子渗透性能和抗碳化能力均与基准混凝土有明显差异。如再生细集料最小粒径从0.16 mm及以下提高到2.36mm就可以明显改善混凝土物理力学性能。Based on a series of recycle process,waste concrete can be made into fine recycled aggregate which can be used completely or partly to compound concrete as a substitute for natural sand.But the special properties of fine recycled aggregate make the performance of concrete with fine recycled aggregate different from normal concrete.Characteristics of fine recycled aggregate and its influence on physical and mechanical properties of concrete are studied.On this basis,the influence of fine recycled aggregate on gas permeation properties,chloride permeability,and carbonation resistance of concrete are also studied.It is found that fine recycled aggregate produces a lot of defects in crushing preparation.And the compressive strength,the chloride permeability and the carbonation resistance of the concrete with fine recycled aggregate as substitution show difference from that of normal concrete.

关 键 词：再生细集料 最小粒径 物理力学性能 抗气渗性能 氯离子渗透性能 

分 类 号：TU522.09[建筑科学—建筑技术科学]