Research on the Performance of Phosphorus Building Gypsum Lightweight Concrete Materials

The phosphogypsum was first roasted into construction gypsum following the national standard GB/T 9776–2008, and then the gypsum-based material properties were investigated in all aspects by using various admixtures and adjuvants, and the gypsum-based material properties such as standard consistency, setting time, mechanical properties, softening coefficient and water absorption, and microstructure were tested and analysed. The experimental results showed that the material components were 62% phosphate gypsum, 15% cement, 23% metakaolin, 1.0% high efficiency water reducing agent type Melflux 5581, 0.3% dispersible emulsion powder type Vinnapas LL 5999/2, 0.3% cellulose ether type Mecelloze 7117, 0.1% protein-based retarder type XY SJ 12, The best performance of the phosphate gypsum-based lightweight concrete material was achieved with a 10% admixture of river sand.