简述工程混凝土硫酸盐侵蚀破坏特征及其防护措施

Features and Protection Measures of Sulfate Attack of Concrete

通过对工程混凝土硫酸盐侵蚀破坏情况的现场调研与文献综述,总结出引起工程混凝土硫酸盐侵蚀破坏的侵蚀源有城市污水、地下水、山体渗漏水、黄铁矿以及原材料中携带的硫酸盐或硫化物。工程混凝土硫酸盐侵蚀破坏特征主要表现为基体开裂,表层剥落,结构松软粉化,强度降低,内聚力丧失,甚至呈泥状;长期侵蚀条件下,可能出现综合性破坏形式;结构破坏的同时,裂纹内或基体表面常析出白色结晶盐。工程混凝土硫酸盐侵蚀的影响因素比较复杂,需要综合防护。

It summarizes the source of sulfate attack in projects,such as municipal sewage,ground water,mountain seepage water,pyrite and sulfate or sulfide in raw materials by review of literatures and site investigation of the damage conditions.The features of sulfate attack are mainly base crack,surface spalling,structure pulverization,reduction in strength,loss of cohesion force and even in muddy state; Under long -term sulfate attack conditions,comprehensive damage may happen; and at the same time of structural damage,white crystal salt will separate from the crack or surface of the base.The influence factors of sulfate attack are very complicated,requiring comprehensive protection.