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| 高温后全取代率再生混凝土三轴受压性能演化规律分析 |
| Analysis on triaxial compressive performance evolution law of RAC with fully replacement rate after high temperature |
| 投稿时间：2024-08-16 修订日期：2024-11-25 |
| DOI： |
| 中文关键词: 高温 全取代率再生混凝土 三轴受压性能 演化规律 |
| 英文关键词:high temperature RAC with fully replacement rate triaxial compressive performance evolution law |
| 基金项目:重庆人文科技学院2022年度校级科研项目(CRKZK2022001)；西南大学实验技术研究项目(SYJ2024013)；中央高校基本科研业务费专项资金资助项目(XDJK2020B021)；国家自然科学基金资助项目(51468003) |
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| 中文摘要: |
| 为研究高温后全取代率再生混凝土的三轴受压性能演化规律,设计制作了20个100%取代率再生混凝土试件,并对其进行不同高温后的三轴受压试验。结果表明：全取代率再生混凝土经不同高温后的单轴应力-应变曲线有明显下降段,随着侧向应力增加,曲线逐渐丰满,当侧向应力超过10MPa后,曲线已无明显下降段。全取代率再生混凝土的三轴受压强度及峰值应变随着侧向应力增加分别呈幂函数与线性函数的增长趋势,侧向应力的存在能有效抑制全取代率再生混凝土内部损伤发展,提升试件耗能性能,并能降低高温对试件三轴受压强度及峰值应变的影响。经600℃高温后,全取代率再生混凝土的三轴受压强度出现显著下降,试件发生明显软化。随着温度上升,全取代率再生混凝土的耗能性能呈现出先上升后下降的变化趋势。基于试验数据,构建了高温环境下全取代率再生混凝土三轴受压强度与峰值应变的通用计算公式,与试验结果吻合良好。 |
| 英文摘要: |
| To study the triaxial compressive performance evolution law of recycled aggregate concrete (RAC) with fully replacement rate after high temperature, 20 RAC specimens with fully replacement rate were designed and fabricated, and triaxial compressive experiments were conducted on them after different high temperatures. The research results show that all the uniaxial stress-strain curves of specimens after different high temperatures have a significant decrease segment. However, with the increase of lateral stress, the stress-strain curve gradually becomes plump. When the lateral stress exceeds 10MPa, the curve no longer has a significant decrease segment. The triaxial compressive strength and peak strain of specimens present the increasing trend of power function and linear function with the increase of lateral stress, respectively. The existence of lateral stress can effectively suppress the internal damage development of specimens, improve their energy dissipation performance, and reduce the influence of high temperature on their triaxial compressive strength and peak strain. After being subjected to a high temperature of 600℃, the triaxial compressive strength of specimens shows a significant decrease, and the specimens have undergone significant softening. With the increase of temperature, the energy dissipation performance of specimens shows a trend of first increasing and then decreasing. Based on the experimental data, a universal calculation formula for the triaxial compressive strength and peak strain of RAC with fully replacement rate under different high temperature was constructed, which has a good agreement with the experimental results. |
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