Freeze-thaw Damage Model and Deterioration Mechanism of Coal Gangue Powder Concrete

被引：0
作者：
Guan, Xiao [1 ]
Long, Hang [1 ]
Ding, Sha [2 ]
Zhang, Pengxin [1 ]
机构：
[1] School of Architectural and Civil Engineering, Xi’an University of Science and Technology, Xi’an
[2] School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an
来源：
Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 16期
基金：
中国国家自然科学基金;
关键词：
admixture; coal gangue; concrete; damage mechanism; damage model; freeze thaw damage;
D O I：
10.11896/cldb.22080144
中图分类号：
学科分类号：
摘要：
To promote the utilization of coal gangue in concrete in cold regions,this work studied the freeze-thaw damage law of mechanically-microwave activated coal gangue powder concrete (CGPC)with different substitution rates under freeze-thaw cycles. The damage layer thickness was corrected for ultrasonic wave velocity loss,and a freeze-thaw damage equation based on the modified damage layer thickness was established. The pore structure parameters,micro morphology,and hydration products of CGPC under freeze-thaw were tested and analyzed. The results show that 10% and 20% of activated coal gangue powder (ACGP)can improve the mechanical properties and frost resistance of concrete,when the content reaches 30%,the improvement effect of frost resistance is obviously weakened,and the mechanical properties are somewhat reduced. After freezing and thawing for 300 times,the compressive strength of 20% and 0% content group decreased by 16. 4% and 26. 5% respectively,the mass loss was 1. 77% and 4. 03% respectively,the relative dynamic elastic modulus was 68. 940% and 91. 321% respectively, and the thickness of damaged layer reached 11. 9 mm and 17. 4 mm respectively. The thickness of damaged layer modified based on ultrasonic velocity difference can more accurately represent the damage degree of CGPC. The particle filling effect and secondary hydration of ACGP improve the strength and frost resistance of CGPC. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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