Review on Effects of Microstructure and Mechanical Properties of Ultra-High Performance Concrete by Curing Regimes

Abstract

Abstract: Ultra-high performance concrete (UHPC) is a fiber reinforced cement-based composite material with ultra-high permeability and mechanical properties. In the process of preparing UHPC, the curing regime of high temperature and pressure is an important measure for UHPC to obtain high performance. The basic mechanical properties and microstructure of UHPC with different curing regimes were reviewed, and the action mechanism of curing regime was analyzed. The research shows that thermal curing accelerates the hydration process of UHPC, improves the compactness of the material, and UHPC can obtain the ultra-high strength. With the introduction of SiO₂ component,UHPC has compact microstructure and good early mechanical properties under thermal curing compared with standard curing. However, excessively high temperature leads to coarsening and microcracks in the pore structure of the interface, resulting in interface damage, which is not conducive to the later strength development of UHPC. This paper aims to comprehensively compare the effects of different curing regimes on the mechanical properties and microstructure of UHPC, so as to guide the production and engineering application of UHPC.

Key words: ultra-high performance concrete, curing regime, mechanical property, microstructure

CLC Number:

TU528

XU Xiangbo, YU Yong, JIN Zuquan, ZHU Chongai. Review on Effects of Microstructure and Mechanical Properties of Ultra-High Performance Concrete by Curing Regimes[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 2856-2870.

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