Clays have emerged as potential partial replacements for cement, allowing for a reduction in global CO₂ emissions without sacrificing strength. However, smectite clay minerals such as montmorillonite (MMT) have dramatic shrink and swell properties, which hampers the consistency of cement paste and generates micro cracks at the interface. In addition, MMT shows strong adsorption and intercalation of poly carboxylate-based superplasticizer because of numerous active sites in their interlayer, which affects the properties of fresh and hardened concrete. In this study, the interlayer alkali cation exchanged by (3-Aminopropyl) triethoxysilane. Silane treatment increased the interlayer spacing and hydrophobicity of MMT. In addition, the shrink and swell index showed 84 % reduction. Cement pastes with silane-modified clay showed needle shaped hydration products and less portlandite content. The mortar fabricated with silane treated MMT showed improved consistency and higher mechanical strength.

粘土已成为水泥的潜在部分替代品，可减少全球 CO ₂在不牺牲强度的情况下排放。然而，蒙脱石粘土矿物如蒙脱石（MMT）具有剧烈的收缩和膨胀特性，这阻碍了水泥浆的稠度并在界面处产生微裂纹。此外，MMT 对聚羧酸减水剂表现出很强的吸附和插层作用，因为其夹层中有许多活性位点，这会影响新拌和硬化混凝土的性能。在本研究中，层间碱性阳离子被（3-氨基丙基）三乙氧基硅烷交换。硅烷处理增加了 MMT 的层间距和疏水性。此外，收缩和膨胀指数显示降低了 84%。含有硅烷改性粘土的水泥浆显示出针状水合产物和较少的硅酸盐含量。