The combined effect of aluminum sulfate (AS) and triethanolamine (TEA) on cement hydration was investigated by techniques of setting time, compressive strength, calorimetry, XRD, and ICP-OES. The results indicate that the increased strength through the addition of AS mainly originates from the accelerated silicate phase reaction. Besides, the combined addition of TEA and AS leads to an aggravated retardation effect on CS hydration, which could be caused by the changed ionic conditions in the pore solution, namely ionic species, concentration and states. Specifically, the complexed ions formed with TEA lead to a stronger inhibited effect on CS hydration compared to that of free ions, which could be caused by the improved adsorption amount of TEA after complexation with ions. Furthermore, TEA complexed with ferric ions shows a higher adsorption amount than that with aluminate ions, which leads to a stronger retardation effect on CS hydration.

中文翻译：

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硫酸铝和三乙醇胺对水泥水化的联合影响的新见解


采用凝结时间、抗压强度、量热法、XRD、ICP-OES等技术研究了硫酸铝（AS）和三乙醇胺（TEA）对水泥水化的综合影响。结果表明，通过添加AS而增加的强度主要源于加速的硅酸盐相反应。此外，TEA和AS的联合添加会加剧CS水化的延迟作用，这可能是由于孔隙溶液中离子条件（即离子种类、浓度和状态）的改变所致。具体而言，与游离离子相比，与TEA形成的络合离子对CS水化具有更强的抑制作用，这可能是由于与离子络合后TEA的吸附量提高所致。此外，与铁离子络合的TEA比与铝酸根离子络合的TEA表现出更高的吸附量，这导致对CS水合具有更强的延迟作用。