Experimental Research on the Mechanical Properties and Autogenous Shrinkage of Precast Members Joint Concrete

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Abstract

In the precast building structure, the joint is the key part that affects the mechanical performance of the assembly structure. By selecting coarse and fine fraction aggregate; adding high quality mineral admixture, expansive agent, and water-reducing agent; and optimizing the mixture ratio design, precast members joint concrete (PMJC) with self-compacting performance, micro-shrinkage, good volume stability, and strength matching with precast concrete is developed. In this study, the PMJC with a water-binder ratio, fly ash, ultra-fine silicon powder, sand rate, expansive agent, and water-reducing agent of 0.38, 30%, 3%, 47.7%, 8%, and 0.7%, respectively, showed a good workability which could meet the conditions of on-site construction. In addition, the strength matched the precast members, and the PMJC had certain ductility and stability, small early contraction, and met the requirements of the joint material.

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Zhu, H., He, Y., Ji, D., Tang, J., & Li, C. (2022). Experimental Research on the Mechanical Properties and Autogenous Shrinkage of Precast Members Joint Concrete. Buildings, 12(3). https://doi.org/10.3390/buildings12030373

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