A Modulus Variation Model of Concrete under External Sulfate Attack:New Perspective from Statistical Evolution of Microcracks  

作　　者：ZHANG Hao SHE Wei 张浩;佘伟

机构地区：[1]School of Material Science and Engineering,Southeast University,Nanjing 211189,China [2]State Key Laboratory of High Performance Civil Engineering Material,Nanjing 211100,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第6期1465-1471,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Key R&D Program of China(No.2017YFB0309904);the 973 Program of China(No.2015CB655100)

摘　　要：A numerical model was proposed to describe the modulus variation of mortar exposed to external sulfate attack and the effectivity was verified by experiments. The model joints statistical evolution of microcracks to effective elastic modulus with microcracks and is applied to predict the damage degree of mortar attacked by sulfate. The experimental results show that the model can predict the modulus variation development of the specimen and the microcraks density. The elastic modulus values calculated by the model are consistent with that measured by experiments. The model focuses on nucleation of microcracks and finds that the theoretical results of microcracks number density show a linear growth over time in mortar. Compared with other sulfate attack damage model, this model provides a more suitable damage evolution equation that can be used to analyze the chemically assisted damage.A numerical model was proposed to describe the modulus variation of mortar exposed to external sulfate attack and the effectivity was verified by experiments. The model joints statistical evolution of microcracks to effective elastic modulus with microcracks and is applied to predict the damage degree of mortar attacked by sulfate. The experimental results show that the model can predict the modulus variation development of the specimen and the microcraks density. The elastic modulus values calculated by the model are consistent with that measured by experiments. The model focuses on nucleation of microcracks and finds that the theoretical results of microcracks number density show a linear growth over time in mortar. Compared with other sulfate attack damage model, this model provides a more suitable damage evolution equation that can be used to analyze the chemically assisted damage.

关 键 词：sulfate attack effective elastic modulus microcracks number density damage evolution 

分 类 号：TB[一般工业技术]