Inorganic Chemicals Industry >
Study on effect of α-hemihydrate gypsum on performance of cement mortar and its hydration mechanism
Received date: 2022-06-13
Online published: 2023-03-17
In order to improve the performance of cement mortar for grouting，α-hemihydrate gypsum was used to replace part of cement for material modification.The effects of α-phosphogypsum content and tailings content on slump，shrinkage，strength，and durability were analyzed.The hydration mechanism of cemental slurry was studied according to the microscopic experiment and mineral composition results.The results showed that using α-phosphogypsum to replace part of cement was beneficial to improve the workability index of cement mortar and reduce the drying shrinkage rate.When the replacement ratio was 15%，the workability，strength and durability of the slurry were significantly improved.The chemical activity of α-phosphogypsum could promote the secondary hydration of the cementitious material and increase the compactness of the filling slurry.This study had important reference function for the preparation of a high-performance composite cement materials.
Key words： cement mortar; α-hemihydrate gypsum; modification; microstructure
LI Peng , WANG Likun , MENG Qiuyan . Study on effect of α-hemihydrate gypsum on performance of cement mortar and its hydration mechanism[J]. Inorganic Chemicals Industry, 2023 , 55(3) : 98 -103 . DOI: 10.19964/j.issn.1006-4990.2022-0269
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