| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Improvement of Water Resistance of Basic Magnesium Sulfate Cement Based on Modification of 517 Phase by Modifiers |
| ZHU Bei1,2, XU Xun1,3,*, HU Hailong4, YU Bo5,6, ZHU Yan2, GAN Lu1
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1 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
2 School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
3 Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530001, China
4 Southwest University of Science and Technology Analytical Testing Center, Mianyang 621010, Sichuan, China
5 School of Civil Engineering and Construction, Guangxi University, Nanning 530001, China
6 Key Laboratory of Ministry of Education for Engineering Disaster Prevention and Structural Safety, Guangxi University, Nanning 530001, China |
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Abstract Recent studies have shown the effect of different modifiers on the growth of endogenous 517 phase ofbasic magnesium sulfate cement (BMSC). In this work, the mechanical strength, phase composition and microstructure of BMSC with the same modifier admixture were investigated using six modifiers with different hydroxyl content with the help of X-ray diffractometer, scanning electron microscope, Raman spectrometer and mercury piezometer. The results show that the 517 phase content is the highest and the aspect ratio is the largest in the specimen with high hydroxyl content of sodium dihydrogen phosphate and potassium dihydrogen phosphate. The compressive strength is nearly doubled compared with that without addition, and the softening coefficient are close to 1.00. The pores in BMSC are mainly intergranular pores, and the 517 phase with large aspect ratio let to more concentrated pore size distribution and lower total porosity. The water resistance of BMSC is related to the content and morphology of 517 phase, and the use of hydroxyl-rich modifier can promote the crystallization of 517 phase, thus increasing the content of 517 phase and its aspect ratio to improve water resistance.
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Published: 10 October 2023
Online: 2023-09-28
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| Fund:Key R & D Program of Science and Technology Department of Sichuan Province (2023YFSY0019), the Systematic Project of Guangxi Key Laboratory of Disaster Prevention and Engineering Safety (2020ZDK006), the Experimental Technology Research Project of Southwest University of Science and Technology(21syjs-32), the Guangxi Science Fund for Distinguished Young Scholars (2019GXNSFFA245004) and the Natural Science Foundation of Guangxi Province (2018GXNSFAA281344). |
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2023, Vol. 37 
