电阻率法研究粉煤灰基地聚合物的凝结硬化

Research on the Setting and Hardening Process of Fly Ash Based Geopolymer Using Electrical Resisivity Method

采用无电极电阻率测量仪自动连续监测了分别掺加0、10%、30%、50%、70%粉煤灰的地聚合物浆体凝结硬化全过程中的电阻率变化,分析了粉煤灰基地聚合物浆体随时间发展的物理化学变化规律,探讨了偏高岭土和粉煤灰与碱激发剂之间的反应机理,并将地聚合化反应过程分成:离子释出、离子重构、凝结硬化及稳定4个特征阶段。最后还提出了地聚合化反应过程模型。

The electrical resistivity changes with time of various geopolymeric pastes with 0, 10 %, 30 %, 50 % and 70 % fly ash are continuously monitoring by using electrodeless resistivity apparatus. The physicochemical process occurred during geopolymerization process is also analysized. According to the characteristics of the resistivity evolution curves, the four stages were well defined： ion release, ion reorientation, setting and hardening, stabilization. Finally, a descriptive microstructural evolution model is proposed.