复合材料科学与工程Issue(10)：32-39,8.DOI:10.19936/j.cnki.2096-8000.20241028.005
复合盐冻融循环后PE-ECC拉伸性能及劣化机理研究
Study on tensile properties and deterioration mechanism of PE-ECC under coupling attack of freeze-thaw cycle and sulfate-chloride
摘要
Abstract
In order to study the tensile properties of polyethylene fiber engineered cementitious composites(PE-ECC)under coupling attack of freeze-thaw cycle and sulfate-chloride,two kinds of environments,pure water and sulfate-chloridesolution(5％Na2SO4+3.5％NaCl),were set up,and the axial tensile tests were carried out after 0,50,100,150,and 200 freeze-thaw cycles,respectively.The test results showed that the damage degree of the specimens in both environments increased with the freeze-thaw cycles,but the degree of surface spalling was more serious and the deformation performance was lower in the sulfate-chloride environment under the same freeze-thaw cycles,but the ultimate strains could all achieve above 2％.On this basis,the micro-mechanism of deterioration of PE-ECC tensile property was investigated by XRD,SEM,EDS energy spectrum analysis,NMR and other techniques.The results show that swelling hydration products such as brucite,gypsum and ettringite produced by sul-fate-chloride erosion cause pores and micro-cracks to develop,which work together with the freezing of water in the pores,aggravates the damage of the internal structure.关键词
复合盐冻/聚乙烯纤维水泥基复合材料(PE-ECC)/拉伸性能/微观机理Key words
compound salt freeze/polyethylene fiber engineered cementitious composites(PE-ECC)/tensile properties/microscopic mechanism分类
通用工业技术引用本文复制引用
郑怡,陈中书,张晋,张耀庭..复合盐冻融循环后PE-ECC拉伸性能及劣化机理研究[J].复合材料科学与工程,2024,(10):32-39,8.基金项目
国家自然科学基金(52178140) （52178140）
