Author(s)

Zixun Xiong ¹, Gongxing Yan ¹, Yong Liu ², Wei Zou ¹, Xiaobing Fang ¹

Affiliation(s)

¹ Luzhou Xinglu Xinsheng Building Materials Group Co., Ltd., Luzhou, 646000, Sichuan, China
² School of Intelligent Construction, Luzhou Vocational and Technical College, Luzhou, 646000, Sichuan, China

Corresponding Author

Gongxing Yan

ABSTRACT

Traditional ultra-high performance concrete (UHPC) faces challenges under high temperature conditions, including unclear mechanisms of mechanical property degradation and difficulties in quantitatively describing the performance changes after the introduction of environmentally friendly coarse aggregates. Based on this, this paper takes ultra-high performance concrete with environmentally friendly coarse aggregate as the research object, and constructs an analytical framework of "multi-scale damage mechanism - performance degradation law - constitutive model expression". By introducing a temperature-related damage variable function, a unified degradation model is established to show the changes in strength and elastic modulus with temperature. Furthermore, piecewise functions are used to achieve a refined expression of degradation characteristics in different temperature zones. On this basis, a two-factor experimental system of temperature (20–800℃) and aggregate replacement rate (0%–100%) is designed to systematically analyze the mechanical properties of the material after high temperature. The results show that with increasing temperature, both the compressive strength and elastic modulus of the material exhibit a significant nonlinear decay trend. The established model can effectively reflect the coupling effect of temperature and aggregate replacement rate, and has a good fitting ability for the mechanical property degradation law.

KEYWORDS

Environmentally Friendly Coarse Aggregate Ultra-High Performance Concrete; High-Temperature Mechanical Property Degradation; Damage Evolution Mechanism; Constitutive Model Construction; Piecewise Functions Expression

CITE THIS PAPER

Zixun Xiong, Gongxing Yan, Yong Liu, Wei Zou, Xiaobing Fang. Deterioration Mechanism of Mechanical Properties of Environmentally Friendly Coarse Aggregate Ultra-High Performance Concrete under High Temperature. Journal of Civil Engineering and Urban Planning (2026). Vol. 8, No.1, 119-127. DOI: http://dx.doi.org/10.23977/jceup.2026.080112.

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