Abstract
The influence of phosphogypsum dosages on geopolymer performance was investigated to address the high drying shrinkage and slow later-stage strength development of all-solid-waste geopolymer materials. Combined with XRD, SEM, and MIP test results, the effects of phosphogypsum on the properties and microstructure of geopolymer materials were discussed. The results indicate that the incorporation of phosphogypsum reduces the early-stage compressive strength of the geopolymer. However, as the curing age increases, the strength continues to grow and stabilizes by 28 d. Meanwhile, phosphogypsum effectively inhibits early drying shrinkage of geopolymer and induces controlled micro-expansion in the later stage. The reaction of phosphogypsum exhibits significant delayed participation, and its dissolution is limited initially, with alkali-activated slag reaction dominating the system. In the later stage, phosphogypsum gradually participates in the reaction, promoting the formation of ettringite and thereby enhancing the strength. The formation of ettringite significantly optimizes the pore structure. As the phosphogypsum dosage increases from 0% to 15%, the total porosity decreases from 22.06% to 20.55%, the number of harmful pores reduces, and the material structure becomes denser. The proportion of fine capillary pores decreases from 40.79% to 23.91%, significantly improving the resistance to drying shrinkage.
Publication Date
8-16-2026
DOI
10.14048/j.issn.1671-2579.2026.04.009
First Page
82
Last Page
88
Submission Date
August 2026
Recommended Citation
Wei, Zong; Qixin, Zhang; Xianzheng, Dong; Cheng, Liu; and Wuxi, Zheng
(2026)
"Effect of phosphogypsum on properties and microstructure of all-solid-waste geopolymer materials,"
Journal of China & Foreign Highway: Vol. 46:
Iss.
4, Article 9.
DOI: 10.14048/j.issn.1671-2579.2026.04.009
Available at:
https://zwgl1980.csust.edu.cn/journal/vol46/iss4/9
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