高性能铁尾矿细骨料再生混凝土碳化力学性能试验研究  

Experimental Study on Carbonation Mechanical Properties of High Performance Iron Tailings Fine Aggregate Recycled Concrete

作　　者：黄钟晖 张世荣 王炳华 孟庆军 HUANG Zhonghui;ZHANG Shirong;WANG Binghua;MENG Qingjun(Narning Rail Transit Group Co.,Ltd.,Nanning,Guangai 530022,China)

机构地区：[1]南宁轨道交通集团有限公司,广西南宁530022

出　　处：《水利与建筑工程学报》2021年第1期28-33,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51178388)。

摘　　要：为了提高废弃物的利用程度,以交通工程所用混凝土为研究对象,对不同铁尾矿细骨料掺入比例下的再生混凝土的抗压强度、劈裂抗拉强度及其变形性能进行试验研究。结果表明:尾矿掺量的增加,使混凝土的立方体抗压强度在碳化前后均出现先增大后降低的趋势,峰值点时掺量为30%;使劈裂抗拉强度值与轴心抗压强度值出现不同的波动,但碳化前后的峰值点时掺量为20%~40%;使再生混凝土的峰值应变与弹性模量均出现不同程度的降低,碳化龄期越长,降低幅度近乎越大。整体上,当尾矿掺量为30%时,使再生混凝土的性能达到或超过普通混凝土,通过研究,为铁尾矿再生混凝土的普及应用提供了理论基础。To promote the utilization of recycled concrete,this paper took the concrete used in road traffic engineering as the research object,the compressive strength,splitting tensile strength and deformation performance of high-performance recycled concrete with different tailings mixing proportion were tested.The results showed that the cube compressive strength of concrete increased first and then decreased with the addition of tailings with different contents before and after carbonation,and the content was 30%at the peak point.While the splitting tensile strength and axial compressive strength fluctuated differently,but the tailings content was 20%~40%at the peak point before and after carbonation,and the peak strain and elastic modulus of recycled concrete were different.The longer the carbonization age was,the greater the reduction.On the whole,when the tailings content was 30%,the performance of recycled concrete could reach or exceed that of ordinary concrete.Through the research,it provided a theoretical basis for the application of tailings recycled concrete.

关 键 词：铁尾矿 再生混凝土 碳化 力学性能 变形性能 

分 类 号：X779.1[环境科学与工程—环境工程]