水利水电科技进展2025，Vol.45Issue(6)：53-60,8.DOI:10.3880/j.issn.1006-7647.2025.06.008
冻融-溶蚀耦合作用下混凝土劣化机理及预测模型
Mechanism and prediction model of concrete deterioration under coupled freeze-thaw and leaching action
摘要
Abstract
To investigate the deterioration process of concrete in severe cold areas under coupled freeze-thaw and leaching action,an experimental study was conducted using an alternating method of rapid freeze-thaw cycles and immersion in ammonium chloride solution.This study examined the time-dependent evolution laws of the physical and mechanical properties and microstructure of concrete,quantified the coupling effects of freeze-thaw and leaching action,and established a predictive model for the degradation of mechanical properties.The results show that under the coupled freeze-thaw and leaching action,both the leaching depth and the amount of calcium leaching increase linearly with the equivalent service duration,while the compressive strength and splitting tensile strength exhibit a negative exponential decay trend.A significant synergistic effect was observed when freeze-thaw and leaching acted concurrently,with the acceleration factors for strength degradation and mass loss rate reaching 1.2 to 1.5 and 20,respectively.The reasons are that freeze-thaw action leads to an increase in porosity and increases the number and width of micro-cracks,and the leaching of solid-phase calcium promotes smoother and larger pores.Furthermore,the temporal evolution of compressive strength damage under individual freeze-thaw,individual leaching,and coupled conditions consistently follows an inverse S-shaped curve pattern.关键词
严寒区混凝土/冻融-溶蚀耦合作用/劣化机理/力学性能劣化预测模型Key words
concrete in severe cold area/coupled freeze-thaw and leaching action/deterioration mechanism/mechanical performance deterioration prediction model分类
建筑与水利引用本文复制引用
吴佳雯,王少伟,刘毅,朱平华,胡坤,曹淼..冻融-溶蚀耦合作用下混凝土劣化机理及预测模型[J].水利水电科技进展,2025,45(6):53-60,8.基金项目
国家自然科学基金项目(52278240) （52278240）
中国水利水电科学研究院水利部水工程建设与安全重点实验室开放研究基金项目(202206) （202206）
江苏省研究生科研与实践创新计划项目(SJCX23_1552) （SJCX23_1552）
