| 摘要: |
| 参考国际建筑官员协会ICBO标准，采用平板约束试验、自制的混凝土塑性应力测试装置以及压汞法，分析了再生细骨料粒径、取代率以及混凝土水灰比、砂率等对再生细骨料混凝土塑性应力、孔结构及塑性收缩开裂性能的影响.结果表明：随着再生细骨料粒径范围的减小，再生细骨料混凝土塑性收缩开裂风险逐渐降低；再生细骨料取代率的增加，使得再生混凝土塑性收缩开裂风险增大；再生细骨料混凝土水灰比对其抗塑性收缩开裂性能至关重要，过大或过小均会提高其塑性收缩开裂风险；选择适当的砂率可以控制再生细骨料混凝土的塑性收缩开裂程度. |
| 关键词: 塑性收缩应力 再生细骨料 开裂性能 粒径 孔结构 |
| DOI：103969/j.issn1007 9629201403019 |
| 分类号: |
| 基金项目:浙江省自然科学基金资助项目（LY13E080012）；宁波创新团队项目（2011B81005）；宁波市社会发展项目（2011C50018） |
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| Effect of Recycled Fine Aggregate on Plastic ShrinkageCracking Properties of Concrete |
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SUN Jiaying1, XIAO Tianxiang1, LU Yangsheng2
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1.Research Center of Green Building Materials and Resources Reuse, Ningbo Institute of Technology,Zhejiang University, Ningbo 315100, China;2.Zhejiang Chicheng Co. Ltd., Dongyang 322100, China
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| Abstract: |
| Taking ICBO standard as a reference and using the flat panel constraint test, self developed concrete plastic stress testing device and mercury intrusion method, the effects of recycled fine aggregate particle size, replacement rate, water cement ratio, sand ratio on the plastic stress, pore structure and the property of plastic shrinkage cracking were investigated. The results show that the risk of cracking of the recycled fine aggregate concrete reduces gradually with decreasing recycled fine aggregate particle size range and increases with increasing replacement ratio of recycled fine aggregate. The water cement ratio of recycled fine aggregate concrete is of great importance to the crack resistance of the concrete, either too high or too low would increase the risk of cracking. Appropriate sand ratio can be chosen to control the cracking of recycled fine aggregate concrete. |
| Key words: plastic shrinkage stress recycled fine aggregate cracking performance particle size pore structure |
