Optimization of Standard Cement Mix Ratio for Concrete Early-Strength Repair Materials

Abstract

Abstract: Aimed at early disease of cement concrete structure in service, researches on the composition of early-strength repair materials have important practical significance. This paper employed sulfoaluminate cement (SAC), ferrite-aluminate cement (FAC), and ordinary Portland cement (OPC) to prepare the composite standard cements, respectively, and analyzed the effect of OPC on the setting time and strength of the composite cements to optimize the mix ratio of early-strength repair materials. The hydration heat, scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TG-DTG) tests were used to study the hydration behavior, microstructure, phase composition, and thermal characteristics of the hydration products under the optimal max ratio. The results show that the optimal mass mix ratio of SAC to OPC is 3∶2 and the optimal mass mix ratio of FAC to OPC is 4∶1. Under the optimal mix ratio, the addition of OPC shortens the time to the peak value of heat release rate curve of the composite cements and reduces the total heat release. The results of SEM, XRD and TG-DTG analyses all indicate that with the addition of OPC, affected synergistically by Ca(OH)₂(CH) from the silicate hydration product and the gypsum in OPC, aluminum gel (AH₃) from sulfoaluminate cement hydrate product reacts with CH and CS to form ettringite (AFt), and the tetracalcium aluminoferate (C₄AF) in ferrite-aluminate cement reacts with CH and CS to form a calcium ferrite aluminate solid solution (C₃(A,F) 3CS H₃₂), which facilitates the hydration process of the composite cements. The research results provide a reference for further experimental studies on cement-based materials for early-strength repair materials.

Key words: composite material, cement, repair material, hydration mechanism, microstructure, mix ratio

CLC Number:

U414
TU528

LI Zuzhong, MAO Haotian, WANG Liang, WU Zhikuan, WEN Shuo, LIU Weidong. Optimization of Standard Cement Mix Ratio for Concrete Early-Strength Repair Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 802-810.

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