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| 再生骨料混凝土抗压强度的试验研究及其机理分析 |
| Experimental Study and Mechanism Analysis of Compressive Strength of Recycled Aggregate Concrete |
| 投稿时间：2019-03-28 |
| DOI：10.16018/j.cnki.cn32-1650/n.201904002 |
| 中文关键词: 再生骨料 再生骨料混凝土 抗压强度 取代率 |
| 英文关键词: recycled aggregate recycled aggregate concrete compressive strength replacement ratio |
| 基金项目: |
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| 中文摘要: |
| 通过试验研究再生骨料取代率对C20、C30再生骨料混凝土(RAC)流动性和抗压强度的影响，结果表明:再生骨料混凝土坍落度随再生骨料取代率增大而减小；当再生骨料取代率为20%、40%、60%、80%和100%时，再生骨料混凝土抗压强度较普通混凝土均明显降低，最大降幅分别达27.5%、28.4%；取代率为50%时再生骨料混凝土抗压强度较普通混凝土分别高出7.2%、6.1%。SEM图像显示旧浆体区内存在较多微裂纹，而新浆体区结构更致密。再生骨料取代率及界面过渡区微观结构是影响再生骨料混凝土抗压强度的主要因素。提高再生骨料品质、优化再生骨料级配、改善界面过渡区微观结构是提高再生骨料混凝土抗压强度的根本途径。 |
| 英文摘要: |
| The influence of the recycled aggregate replacement ratio on the fluidity and compressive strength of C20 and C30 recycled aggregate concrete(RAC)was studied. The results showed that the slump of RAC decreased with the increase of the replacement ratio of recycled aggregate. When the replacement ratio of recycled aggregate is 20%, 40%, 60%, 80% and 100%, the compressive strength of recycled aggregate concrete is significantly lower than that of ordinary concrete, with the biggest decline of 27. 5% and 28. 4%. When the replacement ratio is 50%, the compressive strength of recycled aggregate concrete is 7. 2% and 6. 1% higher than that of ordinary concrete. SEM images showed that there were more microcracks in the old slurry area and more compact structure in the new slurry area. The replacement rate of recycled aggregate and microstructure of interface transition zone are the main factors affecting the compressive strength of recycled aggregate concrete. The basic way to improve the compressive strength of recycled aggregate concrete is to improve the quality of recycled aggregate, optimize the grading of recycled aggregate and improve the microstructure of interface transition zone. |
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