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| 水饱和度对再生混凝土力学性能的影响及微观机理分析 |
| Effect of water saturation on mechanical properties of recycled concrete and micro-mechanism analysis |
| 投稿时间：2023-11-29 修订日期：2024-04-03 |
| DOI： |
| 中文关键词: 再生骨料 水饱和度 单轴压缩 劈裂抗拉 微观机理 |
| 英文关键词:Recycled aggregate Water saturation Uniaxial compression Split tensile Microscopic mechanism |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 为探究再生混凝土在水工建筑物中应用的可行性，提升资源利用效率，对四种骨料取代率下不同水饱和度的再生混凝土进行力学性能试验研究，并结合核磁共振和电镜扫描试验对再生混凝土进行微观机理分析。结果表明：随着骨料取代率和水饱和度的增加，混凝土弹性模量逐渐增大，而抗压强度、峰值应变和劈裂抗拉强度逐渐减小；对试件T2谱曲线进行分析发现骨料取代率为0%、30%、50%和70%试件内的小孔隙数量占比分别为83%、77%、82%、84%；通过扫描电镜观察发现混凝土基质密实度随再生骨料取代率增加而下降，易被自由水渗透，对再生混凝土的力学性能产生不利影响。研究成果可为再生混凝土在水工结构上的应用提供参考。 |
| 英文摘要: |
| In order to explore the feasibility of recycled concrete application in hydraulic buildings and to improve the efficiency of resource utilization. The mechanical properties of recycled aggregate concrete with different water saturation degrees under four aggregate substitution rates were experimentally investigated, and the micro-mechanism of recycled concrete was analyzed by combining nuclear magnetic resonance and electron microscope scanning tests. The results showed that the modulus of elasticity of recycled concrete gradually increased with the increase of aggregate substitution rate and water saturation degree, and the compressive strength, peak strain and split tensile strength gradually decreased. The analysis of T2 spectrum curve of the specimen found that the number of small pores in the specimen with 0%, 30%, 50% and 70% aggregate replacement rate accounted for 83%, 77%, 82% and 84%, respectively. It was found by scanning electron microscope that the density of concrete matrix decreased with the increase of regenerated aggregate substitution rate and was easily permeated by free water. The mechanical properties of recycled concrete were adversely affected. The research results can provide reference for the application of recycled concrete in hydraulic structures. |
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