复合盐冻融循环下机制砂混凝土的劣化规律及寿命预测

doi:10.16552/j.cnki.issn1001-1625.2024.1217

摘要/Abstract

摘要： 本文通过对凝灰岩机制砂混凝土(TMSC)和花岗岩机制砂混凝土(GMSC)进行复合盐冻融循环试验,研究了机制砂混凝土(MSC)的损伤劣化规律及服役寿命。利用质量损失率、相对动弹性模量、抗压强度损失率等宏观指标及XRD、SEM等微观指标来表征MSC的损伤劣化规律及腐蚀机理,同时根据GM(1,1)预测模型对MSC复合盐冻融循环失效次数进行预测。结果表明,随着复合盐冻融循环次数增加,两种MSC的质量损失率先减小后增大,相对动弹性模量逐渐减小,抗压强度损失率逐渐增大。复合盐冻融循环200次后,TMSC和GMSC的质量损失率分别为1.29%和1.75%,相对动弹性模量分别为63.30%和58.70%,抗压强度损失率分别为42.16%和45.58%。TMSC和GMSC分别在复合盐冻融循环204和193次后失效,服役寿命分别为22.47、21.26年,在复合盐冻融环境下TMSC较GMSC表现出更优的服役寿命。

关键词: 机制砂混凝土, 复合盐冻融循环, 损伤劣化, GM(1,1)模型, 服役寿命

Abstract: In this paper, the damage degradation law and service life of mechanism sand concrete (MSC) were studied by composite salt freeze-thaw cycle test of tuff mechanism sand concrete (TMSC) and granite mechanism sand concrete (GMSC). The macroscopic indexes such as mass loss rate, relative dynamic elastic modulus, compressive strength loss rate and the microscopic indexes such as XRD and SEM were used to characterize the damage degradation law and corrosion mechanism of MSC. At the same time, the failure times of MSC composite salt freeze-thaw cycle were predicted according to the GM (1,1) prediction model. The results show that with the increase of the times of composite salt freeze-thaw cycle, the mass loss of the two kinds of MSC decreases first and then increases. The relative dynamic elastic modulus decreases gradually, and the compressive strength loss rate increases gradually. After 200 composite salt freeze-thaw cycle times, the mass loss rate of TMSC and GMSC is 1.29% and 1.75%, the relative dynamic elastic modulus is 63.30% and 58.70%, and the compressive strength loss rate is 42.16% and 45.58%, respectively. TMSC and GMSC fail after 204 and 193 composite salt freeze-thaw cycle times, respectively. The service life is 22.47 and 21.26 years, respectively. TMSC show better service life than GMSC under composite salt freeze-thaw environment.

Key words: mechanism sand concrete, composite salt freeze-thaw cycle, damage deterioration, GM(1,1) model, service life

中图分类号:

TU528.1

刘昊信, 乔宏霞, 马法荣, 付勇, 魏定邦, 张磊. 复合盐冻融循环下机制砂混凝土的劣化规律及寿命预测[J]. 硅酸盐通报, 2025, 44(5): 1634-1645.

LIU Haoxin, QIAO Hongxia, MA Farong, FU Yong, WEI Dingbang, ZHANG Lei. Deterioration Pattern and Life Prediction of Mechanism Sand Concrete under Composite Salt Freeze-Thaw Cycle[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1634-1645.

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