Effect of Al in Slag Blended Cement Paste under Sulfate Attack  

作　　者：胡玲玲 何真 TANG Shengwen LI Yang 

机构地区：[1]State Key Laboratory of Water Resources & Hydropower Engineering Science Wuhan University, Wuhan 430072, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2017年第5期1087-1094,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Key Research Program(973 Program)(No.2015CB655101);National Natural Science Foundation of China(No.51379163)

摘　　要：Unilateral sulfate attack of cementitious materials containing 40% slag with different water to binder ratios was investigated. The results showed that the degradation of slag blended cement pastes was nearly from the corners of paste surface with cracking and spallings, water-to-binder（w/b） ratio made a significant sense to the damage that low w/b ratio led to little weight loss, less cracking and spalling damage and vice versa. Microstructural experimental results demonstrated that in the three different stages of sulfate attack, degradation of pastes was primarily associated with the migration behavior and bonding configuration of aluminum, in the early ages Al was mostly present in C-（A）-S-H, and thus, the damage of pastes hardly appeared while at later ones Al had been largely transferred from C-（A）-S-H into AFt, leading to expansive damage.Unilateral sulfate attack of cementitious materials containing 40% slag with different water to binder ratios was investigated. The results showed that the degradation of slag blended cement pastes was nearly from the corners of paste surface with cracking and spallings, water-to-binder（w/b） ratio made a significant sense to the damage that low w/b ratio led to little weight loss, less cracking and spalling damage and vice versa. Microstructural experimental results demonstrated that in the three different stages of sulfate attack, degradation of pastes was primarily associated with the migration behavior and bonding configuration of aluminum, in the early ages Al was mostly present in C-（A）-S-H, and thus, the damage of pastes hardly appeared while at later ones Al had been largely transferred from C-（A）-S-H into AFt, leading to expansive damage.

关 键 词：sulfate attack slag aluminum ^（27）AlNMR 

分 类 号：TU528[建筑科学—建筑技术科学]