Improvement of Water Resistance of Basic Magnesium Sulfate Cement Based on Modification of 517 Phase by Modifiers

被引：0

作者：

Zhu B. ^{[1
,2
]}

Xu X. ^{[1
,3
]}

Hu H. ^{[4
]}

Yu B. ^{[5
,6
]}

Zhu Y. ^{[2
]}

Gan L. ^{[1
]}

机构：

[1] School of Civil Engineering and Architecture, Southwest University of Science and Technology, Sichuan, Mianyang

[2] School of Materials and Chemistry, Southwest University of Science and Technology, Sichuan, Mianyang

[3] Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning

[4] Southwest University of Science and Technology Analytical Testing Center, Sichuan, Mianyang

[5] School of Civil Engineering and Construction, Guangxi University, Nanning

[6] Key Laboratory of Ministry of Education for Engineering Disaster Prevention and Structural Safety, Guangxi University, Nanning

来源：

Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 19期

关键词：

basic magnesium sulfate cement; hydration products; microstructure; modifier; water resistance;

D O I：

10.11896/cldb.22050264

中图分类号：

学科分类号：

摘要：

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. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.

引用

共 18 条

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