硫酸盐环境下CCCW材料抗腐蚀和自愈合性能试验研究  

Experimental Study on the Corrosion Resistance and Self⁃Healing Performance of Cementitious Capillary Crystalline Waterproofing(CCCW)Materials Under Sulfate Environment

作　　者：何政泽 罗玲[1] 秦拥军[1] 李东锦 HE Zhengze;LUO Ling;QIN Yongjun;LI Dongjin(College of Civil Engineering and Architecture,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830047

出　　处：《铁道建筑》2024年第9期133-139,共7页Railway Engineering

基　　金：新疆维吾尔自治区重点研发计划(2022B03036)。

摘　　要：将外掺水泥基渗透结晶防水材料(Cementitious Capillary Crystalline Waterproofing Materials,CCCW)的胶砂试件和无CCCW材料的胶砂试件分别在清水和5%Na2SO4溶液中进行全浸泡试验。通过对比两种胶砂试件在不同溶液中的质量损失率和抗压强度变化来评定其抗硫酸盐侵蚀能力。通过引入裂缝后观测裂缝自愈情况,通过二次抗压强度修复率表征CCCW材料对裂缝的愈合作用。同时采用压汞试验、扫描电镜和X射线衍射分析等技术对试件孔隙结构、外观形貌和物相成分进行分析。结果表明:外掺CCCW材料降低了硫酸盐侵蚀作用下的质量损失率,提高了CCCW胶砂的抗压强度,延后了侵蚀破坏的发生,表现出良好的抗硫酸盐性能;对比清水环境,5%Na2SO4溶液中裂缝的愈合效果更显著,CCCW材料可以稳定水化产物,促进愈合产物交叉形成网状结构加速裂缝的愈合;CCCW材料能够有效减少有害孔隙的比例,提高胶砂的密实度,水泥浆体的优势孔径从大孔隙范围(77.14 nm)向小孔隙范围(40.27 nm)转移。Full immersion tests on cementitious capillary crystalline waterproofing(CCCW)materials mortar specimens and non CCCW bonded sand specimens were conducted in clear water and 5%Na2SO4 solution respectively.By comparing the mass loss rate and compressive strength changes of two types of mortar specimens in different solutions,their resistance to sulfate corrosion can be evaluated.By introducing cracks and observing their self-healing,the healing effect of CCCW material on cracks was characterized by the secondary compressive strength repair rate.Simultaneously,techniques such as mercury intrusion testing,scanning electron microscopy,and X-ray diffraction analysis were used to analyze the pore structure,appearance,and phase composition of the specimens.The results showed that the addition of CCCW material reduces the quality loss rate under sulfate erosion,improves the compressive strength of CCCW mortar,delays the occurrence of erosion damage,which has exhibited good sulfate resistance.Compared to a clear water environment,the healing effect of cracks is more significant in a 5%Na2SO4 solution.CCCW material could stabilize hydration products,promote the formation of a network structure of healing products,and accelerate crack healing.CCCW material can effectively reduce the proportion of harmful pores,improve the compactness of mortar,and shift the dominant pore size of cement slurry from the large pore range of 77.14 nm to the small pore range of 40.27 nm.

关 键 词：工程材料 抗腐蚀 自愈合 试验研究 水泥基渗透结晶防水材料 

分 类 号：U214.03[交通运输工程—道路与铁道工程] TU528[建筑科学—建筑技术科学]