再生混凝土力学性能试验研究  

Experimental study on mechanical properties of recycled concrete

作　　者：徐萌波 王社良[1,2] 张明明[1] XU Mengbo;WANG Sheliang;ZHANG Mingming(School of Civil Engineering,Xijing University,School of Civil Engineering,Xi′an University of Archit ecture and Technolog)

机构地区：[1]西京学院土木工程学院,陕西西安710123 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《混凝土》2018年第7期72-75,共4页Concrete

基　　金：国家自然科学基金(51178388);陕西省科技统筹创新工程计划(2013SZS01-K01);陕西省攻关项目(2014K06-34)

摘　　要：将收集的3种不同龄期来源的废弃混凝土制备成再生粗骨料(RA-Ⅰ、RA-Ⅱ、RA-Ⅲ ),利用正交试验设计选择合理的再生混凝土配合比,通过对不同取代率和不同使用寿命骨料再生混凝土(RAC)的抗压强度、劈裂抗拉强度和抗折强度进行了试验研究。研究结果表明:对于立方体、轴心抗压强度,在不同取代率的情况下均超过普通混凝土对应的强度;对于劈裂抗拉强度,RA-Ⅰ随着取代率的增加而相继增加,最大增幅达9.58%;RA-Ⅱ和RA-Ⅲ随着取代率的增加呈现先增加后降低的趋势;对于抗折强度,随着取代率的增加呈现先降低后持续增高的趋势。The waste concrete collected from three different age sources is prepared into recycled coarse aggregate（RA-Ⅰ,RA-Ⅱ,RA-Ⅲ ）,the proper proportion of recycled concrete is selected by orthogonal experimental design,the compressive strength,splitting tensile strength and flexural strength of recycled aggregate concrete（RAC）with different replacement rates and service life were studied.The results show that the compressive strength of the cube and the axle is more than that of the ordinary concrete under different substitution rates.For splitting tensile strength,RA-Ⅰ increases with the increase of substitution rate,and the maximum increase is 9.58%.RA-Ⅱ and RA-Ⅲ increase first and then decrease with the increase of substitution rate.For the flexural strength,with the increase of substitution rate,it shows a trend of decreasing at first and then increasing continuously.

关 键 词：再生混凝土 配合比 抗压强度 取代率 

分 类 号：TU528.01[建筑科学—建筑技术科学]