湖南大学学报（自然科学版）2024，Vol.51Issue(11)：197-207,11.DOI:10.16339/j.cnki.hdxbzkb.2024121
干湿循环作用下可溶盐对古建筑青砖劣化机理研究
Study on Deterioration Mechanism of Blue Bricks of Ancient Buildings under Coupling Effect of Drying-wetting Cycles and Soluble Salts
摘要
Abstract
Salt solutions based on Na2SO4,NaCl,MgSO4 and their pairwise mixed salts were set up to conduct drying-wetting cycle tests on blue brick samples,and the effects of soluble salts in the drying-wetting cycles on the quality,surface hardness,elastic wave velocity and color difference of blue bricks were studied.The deterioration mechanism of blue bricks was analyzed from the perspectives of macroscopic,fine and microscopic multi-scale and mineral composition changes.The results show that the mass,wave velocity and hardness of the test all increase first and then decrease,and the hardness continues to decrease.The compressive strength and capillary water absorption rate are reduced to varying degrees.Na2SO4 causes serious damage to the surface layer and a certain depth of blue bricks.MgSO4 destroys the pores in the brick,resulting in small cracks,but it is difficult to damage the surface layer of blue bricks.In contrast,NaCl only weakly erodes the surface layer of the brick.The interaction between the mixed salts changes their location of crystallization,quantity,and solubility,then it results in different deterioration patterns.Compared with single salt,the deterioration characteristics in the mixed salt chamber are more consistent with the disease characteristics in the actual occurrence environment.The results of this research will provide a reference for the protection and restoration of related buildings of brick cultural heritage.关键词
砖结构/可溶盐/干湿循环/多尺度/劣化机理Key words
brick construction/soluble salts/drying-wetting cycles/multi-scale/deterioration mechanism分类
建筑与水利引用本文复制引用
张景科,张浩,王南,白东明,张理想,索晨阳..干湿循环作用下可溶盐对古建筑青砖劣化机理研究[J].湖南大学学报（自然科学版）,2024,51(11):197-207,11.基金项目
白衣寺塔及菩萨殿保护修缮工程前期勘察研究项目(071100271),Preliminary Investigation and Research Project for the Protec-tion and Restoration of the Ancient Pagoda in Baiyi Temple and Bodhisattva Hall(071100271) （071100271）
