The effects of SO3 content on the strength, hydration process and cement strength of Portland cement mortar containing triisopropanolamine (TIPA) were studied by strength test, hydration heat measurement, thermal analysis (TGA), X-ray diffraction (XRD), quantitative X-ray diffraction (QXRD) and scanning electron microscopy (BSE). The influence of slurry microstructure. The results show that the increase of SO3 content is helpful to improve the early strength of cement containing triisopropanolamine; the hydration heat analysis results show that the hydration reaction rate of cement increases, the accumulated heat of hydration for 3 days increases, and the hydration degree is greater, and the conversion process of AFt-AFm is restrained; compared with the hydration of cement containing TIPA, when the addition of SO3 content is 0.6%, sulfate promotes the whole silicic acid. The early hydration of saline phase (C3S + C2S) produces more Ca (OH) 2 (CH) to participate in the hydration of C4AF, which promotes the reaction to produce more AFt to a certain extent, and the cement stone produced by adding SO3 is more compact.
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