非金属矿物聚合材料的制备及性能研究

以偏高岭土、粉煤灰为主要原料,沸石、黏土为辅料,生石灰和钠水玻璃为碱激发剂制备矿物聚合材料.通过正交试验研究了养护温度、养护时间、蒸养时间对抗压强度影响,通过单因素实验研究了生石灰用量、水固比及水玻璃模数对抗压强度影响;并通过红外光谱、X-射线衍射和扫描电镜分析了样品的化学键变化、物相组成及微观形貌.结果表明,最佳的养护条件为养护温度80℃、湿度95%,养护时间72 h,0.8 MPa蒸养8h;生石灰用量、水固比、水玻璃模数的最佳值分别为3%(wt)、0.37、2.3,样品的最大抗压强度为60.8 MPa.

Preparation and Properties of Non-metallic Geopolymer

Geopolymer was prepared with fly ash and metakaolin as the main raw materials,natural zeolite and clay as the auxiliary materials,activated with sodium silicate and quicklime. Influence of curing temperature,curing time and autoclave curing time on compression strength were investigated by orthogonal experiments. Effects of quicklime amount,water-solid ratio and sodium silicate modulus on compression strength were also studied by single factor experiment. Chemical bounding,phase composition and microstructure of geopolymer were characterized by FT-IR,XRD and SEM techniques. Results show that the optimized conditions are curing temperature of 80 ℃,humidity of95%,curing time of 72 h,autoclaved curing at 0. 8 Mpa for 8 h. Quicklime dosage,water solid ratio and the modulus of sodium silicate is 3%( wt),0. 37 and 2. 3,respectively. The compression strength of the optimal sample is 60. 8MPa.