In this study it was determined the impact of calcination or mechano-chemical activation (MCA) on the physico-chemical properties and reactivity of Ca-montmorillonite and Na-montmorillonite clays, and its subsequent effect on phase assemblage evolution of sodium hydroxide activated cements. MCA enabled colour control, enhanced early age reactivity of montmorillonite clays, associated with dehydroxylation and amorphization of the treated clay, while inducing spheroidal particle morphologies and reduced external surface area. These factors led to an accelerated onset of the polycondensation reaction, as well as an enhanced workability of alkali-activated pastes produced with them, compared with pastes produced with calcined clays. Independent of the clay treatment, a sodium aluminosilicate hydrate (N-A-S-H) alongside zeolitic reaction products were identified. This study demonstrates that MCA is an effective route to enhance reactivity of montmorillonites, resolving some challenges when using calcined clays for producing alkali-activated cements.

中文翻译：

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作为碱激活水泥生产前体的热处理或机械化学处理的蒙脱石粘土的结构特征


在这项研究中，确定了煅烧或机械化学活化（MCA）对钙蒙脱石和钠蒙脱石粘土的物理化学性质和反应性的影响，及其对氢氧化钠活化水泥的相组合演化的后续影响。 MCA 能够控制颜色，增强蒙脱石粘土的早期反应性，与处理过的粘土的脱羟基和非晶化相关，同时诱导球状颗粒形态并减少外表面积。与用煅烧粘土生产的糊剂相比，这些因素导致缩聚反应加速发生，并且用它们生产的碱活化糊剂的可加工性增强。与粘土处理无关，鉴定出了硅铝酸钠水合物（N-A-S-H）以及沸石反应产物。这项研究表明，MCA 是增强蒙脱土反应性的有效途径，解决了使用煅烧粘土生产碱激活水泥时的一些挑战。