| 摘要: |
| 通过对压力为0，010，025，050，075倍设计强度下混凝土抗冻性的比较，分析压应力对混凝土抗冻性能的影响.结果表明：当混凝土压应力比控制在010～050时，随着压应力增加混凝土冻融循环寿命提高；当压应力比提高到050～075时，随着压应力增加混凝土冻融循环寿命降低；在临近损坏时，压应力越高，相对动弹性模量下降越快，其冻融破坏的突发性愈强；混凝土表面的剥落损伤与预应力大小无明显关系，但与冻融次数关系较大.建立了不同预压应力下混凝土抗冻预测模型，通过计算对比，证明该模型具有一定的工程价值. |
| 关键词: 受压混凝土 冻融 耐久性 动弹性模量 |
| DOI：103969/j.issn1007 9629201306024 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51178470)；湖南省教育厅科研资助项目(12C0635，13B016) |
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| Experimental Study on Frost Resistant Property ofConcrete at Pressure Stress State |
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LUO Xiao yong1, ZOU Hong bo1, ZHOU Qi feng1, LIANG Yan1, WANG Jun2
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1.School of Civil Engineering, Central South University, Changsha 410075, China;2.Department of Building Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
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| Abstract: |
| Through comparison analysis of frost resistant property of concrete under 0, 010, 025, 050, 075 times design strength pressure stress states, the relation between pressure stress and frost resistant property of concrete was found. It was concluded that the concrete freeze thaw cycle life will increase with the increase of concrete pressure stress when the concrete pressure stress ratio is 010050, but when the stress ratio increases to 050075, the concrete freeze thaw cycle life will deduce with the increase of concrete pressure stress. Approaching the damage, the higher the stress, the relative dynamic elastic modulus decreased faster, the freeze thaw damage is in shorter time. Meanwhile it was found that the concrete surface spalling damage has no obvious relationship with pre stressed capacity, but is relative to freeze thaw cycle times. The concrete frost resistant forecast model was established at the different pressure stress states finally. Through calculating and contrast, it is known that the model is useful for engineering. |
| Key words: prestressed concrete freeze thaw durability dynamic elastic modulus |
