煤矿三元复合胶体防灭火材料的制备与性能研究∗

摘要

A novel compound colloid prevention and distinguishing material by cement-fly ash-sodium silicate ter-nary synergism was prepared with rapid-hardening sulphoaluminate cement and fly ash as aggregate,sodium silicate as binder and adding suspending agent using one-step mixed method.The scanning electron microscopy, setting time,compressive strength,the hydration mechanism and the inhibitor properties of the material were investigated.The results showed that the initial setting time of extinguishing material could be controlled within 1-30 min and with high early compressive strength.The inhibitor properties of the material were about 90% at 60 ℃ celsius,about 80% at 70 ℃ celsius and above 75% at 80 ℃ celsius.A lot of C-S-H gel in the form of floc-culent structures and ettringite were founded,and have a clear shape.The gel covered fly ash,and this gave the paste a wonderful dense texture.The results of industrial experiment showed that the obtained material has good fire prevention and extinguishing effect.%用快硬硫铝酸盐水泥、大掺量粉煤灰、水玻璃,外加悬浮剂,一步混合法制备了三元复合胶体防灭火材料,研究了该材料的凝结时间、抗压强度和阻化性能,观察了微观形貌,探讨了胶凝机理。结果表明,材料胶结体的初凝时间在1~30 min 范围内可控,并具有良好的早期抗压强度；60℃阻化率达90％,70℃达80％,80℃不低于75％；胶结体内部存在大量絮凝状的C-S-H 凝胶,且与粉煤灰胶连,结构密实。工业实验表明该防灭火材料具有良好的防灭火效果。