Experimental study on acoustic emission of steam cured concrete in freeze-thaw environment

被引：0

作者：

Chen B. ^{[1
,2
]}

Chen J. ^{[1
,2
]}

Qiang S. ^{[1
,2
]}

Zheng Y. ^{[3
]}

机构：

[1] State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing

[2] College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing

[3] China Construction Seventh Engineering Division Co. Ltd., Zhengzhou

来源：

Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2023年 / 51卷 / 08期

关键词：

acoustic emission; compressive strength; damage; freeze-thaw environment; steam cured concrete;

D O I：

10.13245/j.hust.230808

中图分类号：

学科分类号：

摘要：

In order to study the strength performance of steam cured concrete in freeze-thaw environment，the compressive strength of steam cured concrete was tested under five freeze-thaw cycles (0，50，100，150 and 200)，and the relationship between strength loss rate and freeze-thaw times was analyzed．On this basis，based on acoustic emission signal parameters，the damage evolution law and process of steam cured concrete in freeze-thaw environment were studied，as well as the fracture type and crack development form of steam cured concrete．The results show that the strength loss rate of steam cured concrete ranges from 4.23% to 41.94% under different freeze-thaw conditions．The results of acoustic emission parameters show that the freeze-thaw environment accelerates the transition from brittle failure to ductile failure of steam cured concrete．The total number of acoustic emission sources decreases with the increase of freeze-thaw times，and the number of acoustic emission sources decreases by 22.26% after 200 freeze-thaw times compared with 0 times．The proportion of tensile fracture value of steam cured concrete decreases with the increase of freeze-thaw times，and the maximum decrease is 80.23 %．The peak value of acoustic emission b value is reduced by freeze-thaw environment，and the peak value of b value of steam cured concrete decreases by 0.18 after 200 times of freeze-thaw cycles． © 2023 Huazhong University of Science and Technology. All rights reserved.

引用

页码：41 / 46

页数：5

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