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不同酸性环境下水泥基三元修补砂浆的腐蚀及机理研究
作者：杨光1，2，李国新1
（1.西安建筑科技大学 材料科学与工程学院，陕西 西安 710055；
2.西安欧亚学院 人居环境学院，陕西 西安 710065）
摘要：为了研究普通硅酸盐水泥-铝酸盐水泥-二水石膏（OPC-CAC-CS）三元修补砂浆的抗酸侵蚀性能，采用在硫酸溶液下的长期试验模拟酸性腐蚀环境，加速腐蚀OPC-CAC-CS砂浆试件。试验设计了pH值分别为1.5、3.5、7.0（水）的3种腐蚀环境，通过加入粉煤灰、纳米二氧化硅（NS）以改善该修补砂浆的耐酸腐蚀性能，从外观形貌、溶蚀量、中性化深度、抗压耐蚀系数等方面并结合XRD分析其腐蚀过程及机理。结果表明：与OPC相比，该三元修补砂浆的抗酸腐蚀性能更好，粉煤灰及NS的加入一定程度上提高了其耐腐蚀性；修补砂浆的水化产物与OPC的水化产物相比更难与酸反应，硫酸对OPC的腐蚀主要为Ca（OH）2的流失，对修补砂浆的腐蚀则主要为膨胀性腐蚀。
关键词：硫酸；普通硅酸盐水泥；铝酸盐水泥；粉煤灰；纳米二氧化硅；水化产物
中图分类号：TU57+8.1 文献标识码：A 文章编号：1001-702X（2022）05-0042-06
Study on corrosion and mechanism of cement-based ternary repair mortar under different acidic environment
YANG Guang1，2，LI Guoxin1
（1.College of Materials Science and Engineering，Xi'an University of Architecture and Technology，Xi'an 710055，China；
2.School of Human Environments and Civil Engineering，Xi'an Eurasia University，Xi'an 710065，China）
Abstract：In order to study the acid erosion resistance of common Portland cement-aluminate cement-dihydrous gypsum （OPC-CAC-CS） ternary repair mortar，a long-term test in sulfuric acid solution was carried out to simulate the acidic corrosion environment，so as to accelerate the corrosion of OPC-CAC-CS mortar specimens. Three kinds of corrosion environment with pH value=1.5，pH value=3.5 and pH value=7.0（water） were designed，the acid corrosion resistance of the repair mortar was improved by adding fly ash and nano silica（NS），and the corrosion process and mechanism were analyzed from appearance morphology，corrosion capacity，neutralization depth，compression and corrosion resistance coefficient and XRD. Experimental research shows that：compared with OPC，the ternary repair mortar has better acid corrosion resistance，and the addition of fly ash and NS improves its corrosion resistance to a certain extent；compared with the hydration products of OPC，the hydration products of repair mortar are more difficult to react with acid；the corrosion of OPC by sulfuric acid is mainly the loss of Ca（OH）2，while the corrosion of repair mortar is mainly the expansive corrosion.
Key words：sulfuric acid，ordinary Portland cement，aluminate cement，fly ash，nano silica，hydration products