增强剂对磷石膏免烧建材的性能影响研究

磷石膏胶凝性较差,阻碍了其在建材领域的资源化利用。通过研究碱激发预处理后磷石膏的物相与微观结构,并掺入增强剂制备了高掺量高抗压强度免烧建材。结果表明：当增强剂添加量为3 mL时,试件强度大大提高,7、28 d与浸水后强度分别为13.75、28.30、17.56 MPa,与空白样相比,7、28 d与浸水后强度增长率分别为62.3%、62.0%、36.8%,并且试件密度最大为2.42 g/cm³,吸水率最小为11.10%,无泛霜。同时28 d试件内部结构致密性较好、孔隙率小,且二水硫酸钙（CaSO₄·2H₂O）峰强较低,CaSO₄·2H₂O主晶相结构变弱,结晶度差,有利于提高石膏试件的强度和致密性,从而优化免烧建材的力学性能。

Study on effect of reinforcement on properties of phosphogypsum non-burning building materials

Phosphogypsum has poor gelation,which hinders its resource utilization in the field of building materials.By study-ying the phase and microstructure of phosphogypsum after alkali-excited pretreatment,the building materials of high content and high compressive strength were prepared by adding reinforcements.The results showed that the strength of the specimen was greatly improved when the amount of enhancer was 3 mL,its strength of 7,28 d and immersion was 13.75,28.30,17.56 MPa respectively.Compared with the blank sample,the growth rate of strength of 7,28 d and immersion was 62.3%,62.0%,36.8% respectively,and the maximum density of the specimen was 2.42 g/cm³,the water absorption was 11.10%,there was no frosting.Meanwhile,the internal structure of the specimen 28 d specimen was relatively compact,the porosity was small,and the CaSO₄·2H₂O peak strength was low.The CaSO₄·2H₂O main crystal phase structure became weaker and the crystallinity was poor,which was beneficial to improve the strength and compactness of the gypsum specimen and thus optimize the mechanical properties of the non burning building materials.