Modification and Mechanism of Phosphorus Building Gypsum Using Admixtures

Abstract

Abstract: Preparation of phosphorus building gypsum (PBG) products is an important way for the resource utilization of phosphogypsum, and the appropriate modification technology is the key to ensure the industrialization of PBG products. PBG was modified by three water reducers, three retarders, two binders and two water retaining agents respectively, the adaptability of admixture varieties to PBG was discussed, and the influence rules of admixture content on the properties of PBG were studied. Moreover, the modification mechanism of the optimized admixture on PBG was analyzed by scanning electron microscope. The results indicate that the polycarboxylate water reducer (PC), vinyl acetate ethylene copolymer redispersible polymer powder binder (VAE), hydroxypropyl methyl cellulose water retaining agent (HPMC) and bone glue retarder (BG) have good adaptability to PBG, and improve the dry strength, bond strength, water retention and prolong the setting time of PBG, respectively. PC and VAE improve the compactness of the internal crystal structure in the hardened PBG, while BG and HPMC make the structure of the hardened PBG more loose.

Key words: phosphorus building gypsum, modification, water reducer, retarder, binder, water retaining agent, mechanism

CLC Number:

TQ177.3

LI Long, LI Beixing, CHEN Pengbo, YIN Shi. Modification and Mechanism of Phosphorus Building Gypsum Using Admixtures[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2400-2410.

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