Static Stability of Ultra-High Performance Concrete Containing Coarse Aggregate

Abstract

Abstract: In order to improve the overall static stability of ultra-high performance concrete containing coarse aggregate (CA-UHPC), the image analysis was employed to investigate the effects of rheological parameters of the mixture (before adding fiber), coarse aggregate content and coarse aggregate gradation on the static stability of CA-UHPC without fiber and with fiber. The results show that the overall uniformity of coarse aggregate increases with the decrease of the average initial clear distance of coarse aggregate. When the yield stress and plastic viscosity of the mixture are small, the uniformity of fiber distribution decreases due to fiber settlement. The addition of fiber reduces the overall uniformity of coarse aggregate, and the coarse aggregate also affects the uniform distribution of fiber. For the CA-UHPC system, the reduction of the average initial clear distance of coarse aggregate particles increases the distribution stability of coarse aggregate, but too low average initial clear distance between coarse aggregate particles affects the distribution of fiber. Therefore, when the content of coarse aggregate is constant, the fiber distribution coefficient can increase without affecting the stability of coarse aggregate by adjusting the coarse aggregate gradation or sand ratio.

Key words: ultra-high performance concrete, static stability, average initial clear distance, rheological parameter, coarse aggregate, fiber distribution

CLC Number:

TU528

JIANG Jian, LI Chuanxi, DENG Shuai, SIDU Yinghu, YANG Sai. Static Stability of Ultra-High Performance Concrete Containing Coarse Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2441-2450.

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