同济大学学报（自然科学版）2024，Vol.52Issue(8)：1286-1296,11.DOI:10.11908/j.issn.0253-374x.23240
多源-多离子耦合作用下水泥胶砂硫酸盐腐蚀机理
Sulfate Corrosion Mechanism of Cement Mortar Under Multi-sources and Multi-ion Coupling Effect
摘要
Abstract
Multi-source and multi-ion coupling corrosion is widespread in cast-in-situ structures in sulphate saline soil area.By premixing Mg2+,Cl-and SO42-into mortar and placing it in different corrosive environments,the pore distribution,mass,size and sulfate concentration at different depths,as well as the evolution law of flexural and compressive strength of specimens were measured during corrosion period.The microstructure and mineral composition of specimens were observed by scanning electron microscope-energy dispersive spectroscopy analysis(SEM-EDS),X-ray diffraction(XRD)and thermogravimetric analysis(TG-DTG).Results show that internal corrosion increased the content of harmful pores and accelerated the corrosion process.Internal corrosion has a significant adverse effect on the development of flexural strength,the strength of the specimens are reduced by 50%～67%compared with that of the specimens without internal corrosion.Internal Mg2+negatively affects the development of the flexural strength of the specimens in the sulfate environment,the flexural strength of the specimens are only 4.4%of that of the non-corrosive specimens.Mg2+in the periphery of specimens alleviates the increasing trend of harmful pore content and has a certain protective effect on the internal structure.关键词
现浇结构/硫酸盐腐蚀/多离子腐蚀/内源腐蚀/劣化机理Key words
cast-in-situ structure/sulfate attack/multi ion corrosion/internal corrosion/deterioration mechanism分类
土木建筑引用本文复制引用
赵高文,王卓,胡亦奇,徐志军,郭梦真,李镜培..多源-多离子耦合作用下水泥胶砂硫酸盐腐蚀机理[J].同济大学学报（自然科学版）,2024,52(8):1286-1296,11.基金项目
国家自然科学基金(41772290,52378322) （41772290,52378322）
陕西省青年科技新星项目(2023KJXX-022) （2023KJXX-022）
长安大学中央高校基本科研业务费专项资金(300102213205) （300102213205）
博士后创新人才计划(BX20200287) （BX20200287）
