硫酸盐侵蚀和干湿、冻融循环下混凝土单轴受压损伤对比

摘要/Abstract

摘要： 为研究宁夏典型服役环境下混凝土材料的损伤特点,本文在硫酸钠侵蚀和干湿、冻融循环三因素的共同作用和耦合作用下研究混凝土棱柱体试样的不同单轴受压应力-应变特点。改变硫酸钠溶液浓度和腐蚀次数,测量试样的质量损失率、相对动弹性模量以及应力-应变曲线。结果表明:随着腐蚀次数的增加,耦合作用下质量损失率和相对动弹模均先增大后减小,共同作用下则均逐渐减小;随着硫酸钠溶液浓度的增大,两种腐蚀制度下试样的应力-应变曲线上升段斜率和峰值应力均逐渐减小,且共同作用比耦合作用劣化效果更明显;随着腐蚀次数的增加,两种腐蚀制度下试样的应力-应变曲线上升段斜率均逐渐减小,耦合作用下峰值应力先增大后减小,共同作用下则逐渐减小,两种腐蚀制度下峰值应变均逐渐增大,共同作用比耦合作用劣化更大。本文提出的两种腐蚀制度下的混凝土应力-应变曲线预测模型可为宁夏服役环境下的混凝土结构寿命预测提供依据。

关键词: 硫酸钠, 干湿循环, 冻融循环, 共同作用, 耦合作用, 应力-应变预测模型

Abstract: In order to study the damage characteristics of concrete under typical service environment in Ningxia, common action and coupled action of three factors, such as sodium sulfate, dry-wet cycle and freeze-thaw cycle were used to investigate different stress-strain curves of concrete uniaxial compressive. Mass loss rate, relative dynamic elastic modulus and stress-strain curves of samples under different concentrations of sodium sulfate solution and differentcorrosion times were measured. The results show that with the increase of corrosion times, the mass loss rate and relative dynamic elastic modulus of coupled action increase first and then decrease, and that of the common action gradually decreases. With the increase of the concentration of sodium sulfate solution, the slopes of upward section of stress-strain curves of samples under the two corrosion systems are gradually decreasing, and the peak stress is gradually decreasing, as a result, the common action deteriorates more than coupled action. With the increase of corrosion times, the slope of rising section of stress-strain curve of specimen under both corrosion regimes decreases gradually, and the peak stress under the coupled action increases first and then decreases, that under the common action gradually decreases. The peak strain under both corrosion systems increases gradually, and the common action deteriorates faster than the coupled action. The prediction models of concrete stress-strain curve under two corrosion systems are established, which can provide a basis for the life prediction of concrete structure under service environment in Ningxia.

Key words: sodium sulfate, dry-wet cycle, freeze-thaw cycle, common action, coupled action, stress-strain prediction model

中图分类号:

TU528

唐子祥, 杨淑雁, 高海海, 徐宁阳. 硫酸盐侵蚀和干湿、冻融循环下混凝土单轴受压损伤对比[J]. 硅酸盐通报, 2024, 43(2): 428-438.

TANG Zixiang, YANG Shuyan, GAO Haihai, XU Ningyang. Uniaxial Compressive Damage Comparison of Concrete under Sulfate Salt and Dry-Wet Cycles, Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 428-438.

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