Effects of Mixing Mineral Admixtures on Properties of Ultra High Performance Wet-Joint Concrete

Abstract

Abstract: Limestone powder and fly ash microbeads were used as mineral admixtures to adjust the properties of ultra high performance wet-joint concrete. The effects of limestone powder and fly ash microbeads on rheological properties, mechanical properties, shrinkage properties and impermeability of ultra high performance wet-joint concrete were studied by setting different mixing ratios. In addition, the hydration performance of ultra high performance wet-joint concrete was analyzed by hydration heat. The results show that when limestone powder is higher than 30% (mass fraction), with the increase content of limestone powder, the plastic viscosity of ultra high performance wet-joint concrete increases first and then decreases. The plastic viscosity of concrete is reduced by 38.0% when added with 50% limestone powder and 50% (mass fraction) fly ash microbeads. The addition of limestone powder promotes the early hydration of cement and improves the early compressive strength of ultra high performance wet-joint concrete, and the maximum growth rate of 3 d compressive strength is 11.6%. The autogenous shrinkage of ultra high performance wet-joint concrete is reduced by adding limestone powder and fly ash microbeads. The impermeability of ultra high performance wet-joint concrete is the best when the content of limestone powder is 30%, and the 28 d chloride ion diffusion coefficient is 0.15×10^-12 m²/s.

Key words: ultra high performance wet-joint concrete, limestone powder, fly ash microbead, plastic viscosity, hydration heat, compressive strength, shrinkage property, impermeability property

CLC Number:

TU528

GE Keyu, LONG Yong, CHEN Luyi, LI Xin, LIU Kaizhi, WANG Yu, SUN Tao. Effects of Mixing Mineral Admixtures on Properties of Ultra High Performance Wet-Joint Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(3): 948-955.

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