α-半水石膏对水泥砂浆性能的影响与水化机理研究

doi:10.19964/j.issn.1006-4990.2022-0269

Abstract

Abstract:

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

CLC Number:

TB322

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.

Figures/Tables 12

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原料	化学成分质量分数/%
原料	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	K₂O	P₂O₅
水泥	21.2	6.2	3.3	63.0	2.8	2.1	1.2	0.0
α-半水石膏	7.1	15.2	0.0	36.4	3.0	21.1	2.1	1.1

试件组别	取代率/ %	质量浓度/（kg•m^-3）
试件组别	取代率/ %	石膏	水泥	尾砂	天然砂	水
0-0	0	0	400	0	1 440	288
15-0	15	60	340	0	1 440	288
30-0	30	120	280	0	1 440	288
0-50	0	0	400	720	720	288
15-50	15	60	340	720	720	288
30-50	30	120	280	720	720	288
0-100	0	0	400	1 440	0	288
15-100	15	60	340	1 440	0	288
30-100	30	120	280	1 440	0	288

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Study on effect of α-hemihydrate gypsum on performance of cement mortar and its hydration mechanism

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