This paper reports the strength-promoting mechanism of alkanolamines on limestone-calcined clay cement (LC³). The hydration kinetics, phase formation and microstructure of LC³ with triethanolamine (TEA) or triisopropanolamine (TIPA) were investigated. TEA enhanced the strength of LC³, while TIPA was effective at 28 days, and a correct sulfate addition promoted their effects. Alkanolamines accelerated the aluminate reaction of LC³ during early hydration, increased sulfate slowed this reaction by producing more ettringite. TIPA favoured the hydration of ferrite in clinker, not only accelerated the silicate reaction of metakaolin, but also resulted in a rapid limestone reaction. Alkanolamines altered the morphology and chemical composition of the aluminate hydrates and C-A-S-H. Alkanolamines enabled the reduction of porosity of hardened pastes and the increased sulfate further refined them. It was the large pores being induced by TIPA at early ages that were considered to have an adverse impact on the early strength of LC³.

本文报道了链烷醇胺对石灰石煅烧粘土水泥 (LC ³ )的强度促进机制。研究了 LC ³与三乙醇胺 (TEA) 或三异丙醇胺 (TIPA)的水合动力学、相形成和微观结构。TEA 增强了 LC ³的强度，而 TIPA 在 28 天时有效，正确的硫酸盐添加促进了它们的效果。烷醇胺加速LC ³的铝酸盐反应在早期水合过程中，增加的硫酸盐会产生更多钙矾石，从而减缓了这一反应。TIPA有利于熟料中铁素体的水化，不仅加速了偏高岭土的硅酸盐反应，而且导致了石灰石的快速反应。烷醇胺改变了铝酸盐水合物和 CASH 的形态和化学组成。链烷醇胺能够降低硬化膏体的孔隙率，而增加的硫酸盐可以进一步精制它们。TIPA 在早期产生的大孔隙被认为对 LC ³的早期强度产生不利影响。