Triethanolamine (TEA) is a widely employed cement accelerator that has been demonstrated to have a favorable impact on the early strength of cement at moderate dosing levels, while having a slight or negative impact on the later strength. This study systematically investigates the hydration pattern and strength development of Portland cement systems with the incorporation of fly ash microspheres and silica fume at a dosage of 0.02 % triethanolamine. The results proved that the addition of TEA had a positive impact on the early strength of the pure Portland cement system, while the later strength was reduced. However, the presence of high pozzolanic activity supplementary cementitious materials (SCMs) altered this reduction and even reversed it, resulting in an increase in strength. Specifically, TEA inhibits the crystallization nucleation growth of hydration products through complexation, resulting in the inhibition of the hydration of silicate minerals. The nucleation effect of silica fume, however, eliminates this inhibition and promotes the hydration of all minerals. Moreover, the presence of SCMs leads to the formation of more amorphous calcium hydroxide (CH) due to the demand of pozzolanic reaction, and the addition of TEA promotes the formation of amorphous CH, effectively lowering the reaction threshold of the pozzolanic reaction and facilitating it. The results confirm that the interaction of the complexation reaction of TEA with the pozzolanic reaction provides a beneficial complement to cement strength development.

三乙醇胺 (TEA) 是一种广泛使用的水泥促进剂，已被证明在中等剂量水平下对水泥的早期强度有有利的影响，而对后期强度有轻微或负面影响。本研究系统地研究了掺入粉煤灰微球和硅灰（剂量为 0.02% 三乙醇胺）的波特兰水泥体系的水化模式和强度发展。结果证明，TEA的添加对纯硅酸盐水泥体系的早期强度有积极影响，而后期强度则有所降低。然而，高火山灰活性补充胶凝材料（SCM）的存在改变了这种减少，甚至逆转了这种减少，导致强度增加。具体来说，TEA通过络合抑制水化产物的结晶成核生长，从而抑制硅酸盐矿物的水化。然而硅粉的成核作用消除了这种抑制并促进所有矿物质的水合作用。此外，由于火山灰反应的需要，SCMs的存在导致更多无定形氢氧化钙（CH）的形成，而TEA的添加促进了无定形CH的形成，有效降低了火山灰反应的反应阈值并促进其顺利进行。 。结果证实，TEA 的络合反应与火山灰反应的相互作用为水泥强度的发展提供了有益的补充。