Effect and Mechanism of Soluble P2O5 on the Early Hydration of Ultra-fine Sulfoaluminate Cement-based Double Liquid Grouting Materials
ZHANG Jianwu1,2,*, GUAN Xuemao2, WANG Xiao1, JIN Biao1, ZHANG Xiaoting1
1 School of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467036, Henan, China 2 Henan Key Laboratory of Materials on Deep-Earth Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
Abstract: In order to guide the efficient application of phosphogypsum in ultra-fine sulfoaluminate cement-based double liquid grouting materials (SCBGM), the effect of soluble P2O5 on the early hydration performance of SCBGM at high water-cement ratio and its mechanism were studied. The results showed that the addition of soluble P2O5 did not significantly affect the setting time of SCBGM slurry. When the soluble P2O5 content was between 0% and 1.5%, the early strength of SCBGM increased with the increase of the soluble P2O5 content. At the optimum dosage of 1.5%, soluble P2O5 can significantly increase the amount of ettringite in early hydration of SCBGM, and also significantly optimize the distribution characteristics of ettringite in the hardened body, which changed from cluster shape to highly lapped staggered distribution, so as to achieve full potential of the strength skeleton effect of ettringite crystal.
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2024, Vol. 38 
