Effect of ground granulated blast-furnace slag slurries by wet-grinding on the mechanical properties and hydration process of hemihydrate phosphogypsum

Improving the performance and utilization rate of β-hemihydrate phosphogypsum (β-HPG) is an important measure to reduce the environmental pollution of phosphogypsum (PG). In this study, wet grinding was employed to increase the fineness of ground granulated blast-furnace slag (GGBS), thereby facilit...

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Bibliographic Details
Published in:Materials today communications 2024-12, Vol.41, p.111006, Article 111006
Main Authors: Jin, Zihao, Wang, Chen, Cui, Chengjia, Su, Ying, He, Xingyang, Zhi, Zhenzhen, Chen, Shun, Yang, Chao, Guan, Shiyu
Format: Article
Language:English
Subjects:
Beta-hemihydrate phosphogypsum
Ground granulated blast-furnace slag slurry
Mechanical strength
Microstructure
Softening coefficient
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Summary:Improving the performance and utilization rate of β-hemihydrate phosphogypsum (β-HPG) is an important measure to reduce the environmental pollution of phosphogypsum (PG). In this study, wet grinding was employed to increase the fineness of ground granulated blast-furnace slag (GGBS), thereby facilitating its use in the modification of β-HPG. Two different particle sizes of GGBS slurries were prepared, with D50 values of 6.71 µm and 4.17 µm, respectively. The results indicate that specimens with 20 % wet-ground GGBS (WT2G20) have a remarkable 216.1 % increase in 28 d compressive strength and a 114.7 % increase in the softening coefficient compared to specimens without GGBS, and the hydration heat flow is delayed, but the total exothermic quantity increased from 67.8 J/g to 75.6 J/g, simultaneously. Ettringite, gels and other hydration products increase with the increase of GGBS slurry fineness. These products are filled between the pores of calcium sulfate dihydrate (DH) crystal or lapped together to protect the crystallization point of DH crystal, which will not cause volume stability problems, further reducing the overall porosity of the system, and making the microstructure of the hardened paste more compact. Accordingly, GGBS after wet-grinding can markedly enhance the macro properties of β-HPG, developing a cementitious material that is effective and environmentally friendly for utilizing PG. [Display omitted]
ISSN:2352-4928
2352-4928
DOI:10.1016/j.mtcomm.2024.111006