含纤维再生UHPC细集料对砂浆性能的影响及机理研究

IF 8.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2025-08-03 DOI:10.1016/j.dibe.2025.100732

Xianliang Zhou , Xi Zhu , Xiaojun Zhou , Yingda Zhang , Ping Wu , Qingjun Ding

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引用次数: 0

摘要

废旧高性能混凝土（UHPC）的回收利用与传统废旧混凝土相比数量较少，往往被忽视。研究了再生UHPC细骨料（R-UHPC-FA）替代率（0%、25%、50%、75%和100%）对砂浆物理、力学、收缩和抗冻性能的影响。结果表明，R-UHPC-FA含量的增加会降低砂浆的流动性。砂浆密度先增大后减小，吸水率呈相反趋势。28天，与不含R-UHPC-FA的砂浆相比，含有100% R-UHPC-FA的砂浆的抗压强度和抗折强度分别提高了8.43%和25.16%。此外，100%的替换率降低了干燥收缩，提高了抗冻性，这被认为是最佳的替换率。微观分析表明，钢纤维和R-UHPC-FA中高活性物质的双重作用是砂浆力学性能和耐久性提高的主要原因。

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Research on the influence and mechanism of recycled UHPC fine aggregates containing fibers on the performance of mortar

The recycling and utilization of waste Ultra-High-Performance Concrete (UHPC) is often overlooked due to its smaller quantity compared to traditional waste concrete. This study investigates the influence of recycled UHPC fine aggregate (R-UHPC-FA) replacement ratios (0 %, 25 %, 50 %, 75 %, and 100 %) on the physical, mechanical, shrinkage, and frost resistance properties of mortar. The results revealed that increasing R-UHPC-FA content reduced the flowability of mortar. The mortar density increased initially and then decreased, while water absorption followed an inverse trend. At 28 days, compressive and flexural strengths of the mortar containing 100 % R-UHPC-FA improved maximally by up to 8.43 % and 25.16 %, respectively, compared to mortars without R-UHPC-FA. Furthermore, a 100 % replacement ratio reduces drying shrinkage and enhances frost resistance, which is regarded as the best replacement rate. Microscopic analysis indicated that the improvements in mechanical properties and durability of mortar were attributed to the dual effects of steel fibers and highly active substances in R-UHPC-FA.

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.