【摘要】 盐类侵蚀是造成建筑墙体产生病害的主要原因.为探究在长期自然环境中遭受不同损伤程度的历史建筑青砖在碳酸氢钠（NaHCO₃）和硫酸钠（Na₂SO₄）混合盐溶液干湿循环侵蚀作用下的性能劣化演变规律，通过对不同损伤程度青砖进行混合盐干湿循环试验，分析在侵蚀前后试样的质量、吸水率和剥蚀深度等指标的变化情况；基于损伤力学理论，建立了不同损伤程度青砖在侵蚀环境下的累积损伤模型；另外，给出了青砖抗压强度与干湿循环次数之间的演化方程，还对青砖剩余寿命进行了预测.结果表明，损伤为混合盐溶液的侵入提供了便利条件，加剧了青砖试样在混合盐溶液中的劣化程度；随着侵蚀时间的延长，试样的吸水率和剥蚀深度均增大，质量呈现出先增加后降低的趋势；证实了累积损伤模型与试验结果具有较高的吻合度；研究成果可为相似环境下评价历史建筑砌体结构的服役状态提供依据.更多还原

【Abstract】 Salt erosion was the main cause of building wall diseases. In order to investigate the performance degradation and evolution of historical building bricks with different degrees of damage in the long-term natural environment under the erosion of sodium bicarbonate and sodium sulfate mixed salt solution in wet and dry cycles, we analyzed the changes in the mass, water absorption, spalling depth and other indexes of the specimens before and after the erosion through the mixed-salt wet and dry cycle test for bricks with different degrees of damage, and established a cumulative damage model for bricks with different degrees of damage in the erosive environment based on the damage mechanics theory. In addition, the evolution equation between compressive strength and the number of wet and dry cycles was given. Based on the damage mechanics theory, the cumulative damage model of bricks in erosion environment was established; in addition, the evolution equation between the compressive strength of bricks and the number of dry and wet cycles was given, and the remaining life of bricks was predicted. The results show that the damage facilitates the intrusion of the mixed salt solution and intensifies the deterioration of the brick specimens in the mixed salt solution; with the extension of the erosion time, the water absorption and spalling depth of the specimens increase, and the quality shows a tendency of increasing and then decreasing; it was confirmed that the cumulative damage model has a high degree of agreement with the experimental results; and the results of the research could provide a basis or a reference for evaluating the service status of masonry structures of historical buildings in similar environments. The research results could provide a basis or reference for the evaluation of the service condition of historical masonry structures in similar environments.更多还原