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

The application of recycled aggregates still suffers from problems such as large performance fluctuations and insufficient stability in terms of interface defect control, mix proportion matching, and structural density adjustment. Therefore, this paper constructs a synergistic method encompassing aggregate pretreatment, mix proportion design, and preparation process optimization for the environmentally friendly coarse aggregate UHPC system. At the material level, pore defects in recycled coarse aggregates are reduced through crushing, screening, and surface strengthening treatment. In mix design, the multi-admixture composite system is optimized based on particle packing theory, and the slurry and aggregate are precisely matched through volume distribution and interface correction methods. During the preparation process, staged feeding and efficient stirring processes are used to improve the uniformity of coating, and vibration compaction and temperature-controlled curing are combined to strengthen the internal structure densification, thereby achieving synergistic control over the development of fluidity, porosity, and strength. The results show that under the conditions of coarse aggregate volume fraction of 0.30%, water-cement ratio of 0.21, and silica fume content of 15%, the system exhibits the best comprehensive performance, with a spread of up to 720 mm and a T500 of 4.5 s, demonstrating good workability. Simultaneously, the 28-day compressive strength reaches 145.2 MPa, an increase of approximately 12.3% for the higher aggregate content group, while the porosity decreases to 3.9%.

KEYWORDS

Environmentally Friendly Coarse Aggregate Ultra-High Performance Concrete; Recycled Coarse Aggregate Treatment; Mix Design Optimization; Particle Packing Model; Preparation Process Optimization

CITE THIS PAPER

Zixun Xiong, Gongxing Yan, Yong Liu, Wei Zou, Xiaobing Fang. Mix Design and Preparation Process of Environmentally Friendly Coarse Aggregate Ultra-High Performance Concrete. Journal of Civil Engineering and Urban Planning (2026). Vol. 8, No.1, 110-118. DOI: http://dx.doi.org/10.23977/jceup.2026.080111.

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