Freezing-Thawing Damage Mechanism and Evolution Model of Concrete Mixed with CWCPM

被引：1
|
作者：
Xue C. [1 ,2 ]
Shen A. [2 ]
Qiao H. [1 ]
机构：
[1] School of Civil Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu
[2] School of Highway, Chang'an University, Xi'an, 710064, Shaanxi
来源：
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | 2020年 / 48卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Anti-frost performance; Construction waste composite powder materials; Deterioration mechanism; Pore structure; Prediction model;
D O I：
10.12141/j.issn.1000-565X.190272
中图分类号：
学科分类号：
摘要：
The pile-up of significant amount of construction waste and the deterioration of the durability of cement concrete under freezing-thawing cycling are two major challenges in civil engineering.In order to improve the reuse rate of the construction waste and to have better understanding of the deterioration mechanism of concrete mixed with construction waste (brick powder) composite powder materials (CWCPM) under freezing-thawing condition, laboratory experiment and theoretical analysis were carried out.The effect of different factors on the macroscopic performance deterioration of concrete was investigated and the freezing-thawing damage evolution model of concrete mixed with CWCPM was established by multifactor analysis.The microscopic structure and appearance and pore structure of the concrete were also analyzed, and the deterioration mechanism was revealed.The results show that the degree of freezing-thawing damage increased with the increase of water cement ratio, the number of freezing-thawing cycles and the concentration of the salt solution.The anti-frost performance of the concrete was improved by the CWCPM.Compared with the control specimen, the amount of stripping per unit area and the compressive strength of the concrete specimen with 30% CWCPM decreased by 27.1% and increased by 6.2% respectively, after 50 cycles of freezing-thawing.The freezing-thawing damage evolution model based on macroscopic test results can predict the frost resistance of concrete accurately.In essence, the deterioration of the concrete under freezing-thawing condition is a physical process during which its microscopic structure gradually become loose and its pore structure become worse. © 2020, Chemical Industry Press. All right reserved.
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页码：136 / 144
页数：8
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