Insight into the interaction mechanism between superplasticizers and soluble phosphorus in hemihydrate phosphogypsum

被引：0
作者：
Cao, Wenxiang [1 ]
Zhao, Min [2 ]
Peng, Jiahui [3 ]
Zou, Fubing [1 ]
Tian, Weichen [1 ]
Wang, Xingang [1 ]
机构：
[1] Nanchang Univ, Sch Infrastruct Engn, Nanchang 330031, Peoples R China
[2] Yangtze Normal Univ, Sch Civil & Architectural Engn, Chongqing 408100, Peoples R China
[3] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2025年 / 470卷
基金：
中国国家自然科学基金;
关键词：
Hemihydrate phosphogypsum; Superplasticizer; H3PO4; Dispersion ability; Adsorption behaviour; NON-FIRED BRICKS; GYPSUM; HYDRATION; WATER; CEMENT; WASTE; IMPURITIES; ADSORPTION; RHEOLOGY; SURFACE;
D O I：
10.1016/j.conbuildmat.2025.140715
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Soluble phosphorus can weaken the improvement efficiency of superplasticizers in hemihydrate phosphogypsum (HPG). However, the interaction mechanism between superplasticizers and soluble phosphorus remains unclear. This study systematically investigated the influence of PCEs, FDNs, and SMFs on the hydration and microstructure of H3PO4-containing HPG plasters and their adsorption behaviour were discussed. Results show that H3PO4 impaired the dispersion ability of superplasticizers by occupying Ca2 + active sites and forming CaHPO4.2 H2O and H3PO4.1/2H2O layers on gypsum surface, thereby reducing the adsorption amounts. PCEs can interact with H3PO4.1/2H2O through electrostatic attraction due to its negative charge, resulting in an increase in optimal content, while SMFs bonded with H3PO4.1/2H2O via hydrogen bonds, further improving the dispersion ability. Besides, SMFs-modified HPG plasters exhibited lower H3PO4.1/2H2O content. H3PO4 accelerated the hydration and setting, reduced crystal size and increased the porosity of HPG plasters, whereas superplasticizers promoted crystal growth and decreased porosity. Moreover, the H3PO4.1/2H2O layer on gypsum surface resulted in weaker connections among gypsum crystal grains. Notably, SMFs demonstrated superior improvement efficiency in phosphorus-containing HPG.
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页数：11
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