Common clay deposits contain a variety of minerals that provide low and unpredictable reactivity even after calcination. This study aims to enhance the reactivity of such low-grade clay via alkali thermal fusion, where clay was co-calcined with different dosages of NaOH to achieve superior reactivity. The effects of such co-calcination on the formation of reactive aluminosilicates were monitored using high-temperature in-situ X-ray Diffraction (XRD). Additionally, the role of different alkali dosages on the characteristics of the calcined clays was studied using ex-situ XRD, FTIR, ICP-OES, and ²⁹Si NMR. The co-calcination process significantly enhanced the Al and Si dissolution from the calcined clays, which subsequently improved their pozzolanic properties. All of the alkali-fused SCMs satisfied the modified strength activity index (SAI) requirement and the lower dosages of alkali-containing samples (5 % NaOH) showed 50 % reduction in expansion due to alkali silica reaction.

常见的粘土沉积物含有多种矿物质，即使在煅烧后，这些矿物质的反应性也较低且不可预测。本研究旨在通过碱热熔融提高此类低品位粘土的反应性，其中粘土与不同剂量的 NaOH 共煅烧以实现优异的反应性。使用高温原位 X 射线衍射 (XRD) 监测这种共煅烧对反应性铝硅酸盐形成的影响。此外，还利用异位 XRD、FTIR、ICP-OES 和^{29 Si NMR 研究了}不同碱剂量对煅烧粘土特性的影响。共煅烧过程显着增强了煅烧粘土中铝和硅的溶解，从而改善了它们的火山灰性能。所有碱熔 SCM均满足改进的强度活动指数 (SAI) 要求，并且较低剂量的含碱样品 (5% NaOH) 显示由于碱二氧化硅反应导致的膨胀减少了 50%。