A novel method for preparing phosphorus building gypsum (PBG)-based building materials with low water/gypsum ratios
Journal of Material Cycles and Waste Management(2023)
Abstract
It is necessary to consider the dual problems of poor performance and low production efficiency that stem from the highly utilised water/gypsum ratios in the traditional preparation of phosphorus building gypsum (PBG)-based building materials. These problems cannot be easily overcome because that PBG tends to agglomerate at low water/gypsum ratios, which will hinder the hydration process and result in poor mechanical behaviour. In this study, a slurry-particle mixing system was proposed for the preparation of PBG-based building materials with homogeneous hydration at low water/gypsum ratios. More specifically, slurry-particle mixing system samples (SPMS) and pure PBG slurry samples (PPSS) with various water/gypsum ratios were prepared for comparative analysis. The results showed that the fluidity of SPMS with a low water/gypsum ratio could meet the actual production requirements. When compared with the PPSS, the SPMS had a lower water content and a higher dry density at the same water/gypsum ratios. When the water/gypsum ratio was low (e.g., 0.30), the SPMS exhibited more satisfactory moulding behaviour, greater absolutely dry compressive strength, and lower total porosity. In summary, this study presents a feasible method and viable theoretical guideline for the manufacture of PBG-based building materials with low water/gypsum ratios.
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Key words
Phosphorus building gypsum,Slurry-particle mixing system,Low water/gypsum ratios,Performance,Pore structure
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