Development and optimization of phosphogypsum-based geopolymer cement

被引：57

作者：

Wang, Yongrui ^{[1
,2
]}

Huo, Hong ^{[3
]}

Chen, Bing ^{[1
,2
]}

Cui, Qi ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Ocean Engn, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, Dept Civil Engn, Shanghai Key Lab Digital Maintenance Bldg & Infras, Shanghai 200240, Peoples R China

[3] Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, England

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 369卷

关键词：

Hemihydrate phosphogypsum; Geopolymer; Mechanical properties; Microstructure; C-S-H; FLY-ASH; TREATED PHOSPHOGYPSUM; THERMAL-PROPERTIES; SLAG; HEMIHYDRATE; METAKAOLIN; STRENGTH; DIFFRACTION; ABSORPTION;

D O I：

10.1016/j.conbuildmat.2023.130577

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Phosphogypsum (PG) is a solid waste product that is generated in the phosphoric acid manufacturing process, most of which is currently sent to landfills rather than reused. In this study, beta-hemihydrate phosphogypsum (beta-HPG), slag, fly ash (FA) and alkali activator were mixed to form a phosphogypsum-based geopolymer (PBG) cement. The effects of the slag and FA content, citric acid (CA) dosage, sodium metasilicate (SM) dosage, and water addition process were investigated. The results indicated that the 28-day unconfined compressive strength (UCS) of the cement can exceed 60 MPa when a reasonable mix proportion is adopted. The hydration products and strength formation mechanism of the PBG cement were assessed using XRD-Rietveld and SEM-EDS. The micro-analysis results indicated that the main hydration products were dihydrate phosphogypsum, ettringite, and C-S-H gel, which jointly provided the strength for the PBG cement. The PBG cement may improve the utilisation prospects of PG waste.

引用

页数：11

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