磷石膏砌块耐水性研究

Experimental Study on Water Resistance of Phosphogypsum Block

摘要: 磷石膏作为气硬性胶凝材料，有着耐水性差的特点。加入磷酸，模拟磷石膏中可溶性磷杂质浓度对磷石膏耐水性影响。结果说明适量浓度的磷酸显著地改善磷石膏砌块的耐水性能，但随着磷酸浓度的增加，磷石膏砌块强度损失率较高。在磷石膏掺入液体石蜡、硅油、聚乙烯醇等防水剂制备磷石膏砌块，显著提高了磷石膏的防水性能。当液体石蜡，硅油，聚乙烯醇的掺量分别为磷石膏质量的2.0%，0.5%，0.3%时，制备的石膏砌块具有非常好的耐水性能，并且强度损失较小。

Abstract: As a gas-hardening cementitious material, phosphogypsum has the characteristics of poor water resistance. Phosphoric acid was added to simulate the effect of the concentration of soluble phos-phorus in the phosphogypsum on the water resistance of the phosphogypsum. The results show that the proper concentration of phosphoric acid significantly improves the water resistance of the phosphogypsum block, but with the increase of the phosphoric acid concentration, the strength loss rate of the phosphogypsum block is higher. Phosphogypsum blocks are prepared by incorporating phosphogypsum into liquid paraffin, silicone oil, polyvinyl alcohol and other waterproofing agents, which significantly improves the waterproof performance of phosphogypsum. When the liquid paraffin, silicone oil, and polyvinyl alcohol are respectively 2.0%, 0.5%, and 0.3% of the mass of the phosphogypsum, the prepared gypsum block has very good water resistance and the strength loss is small.