本文研究了煅烧温度（600~900 ℃）对含 14.6% 高岭石和 17.8% 2:1 粘土矿物的低品位粘土物理特性和微观结构变化的影响。采用强度活性指数和相对强度指数评价煅烧低品位粘土作为胶凝辅助材料的火山灰活性。结果表明，600 ℃时高岭石由结晶相转变为无定形偏高岭土相，而粘土的粒径先增大后减小。最佳煅烧温度在 700 至 800 °C 之间，而最佳水泥替代量为 10-20 wt%。

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This paper studied the effect of calcination temperatures (600–900 °C) on physical characteristics and microstructure changes of low-grade clay containing 14.6% kaolinite and 17.8% 2:1 clay mineral. The pozzolanic activity of calcined low-grade clay as a supplementary cementitious material was evaluated using strength activity index and relative strength index. The results show that the kaolinite transformed from crystalline phase to amorphous metakaolin phase at 600 °C, while the particle size of clay first increases and then decreases. The optimal calcination temperature is found between 700 and 800 °C, whereas the optimal cement replacement level is 10–20 wt%.