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| 摘要: |
| 对高性能混凝土（ＨＰＣ）在经历不同的高温和冷却制度后的剩余力学性能及其相应的孔结构进行了测定，并与普通混凝土（ＮＣ）的测试结果进行了对比，研究发现，经历高温后ＨＰＣ和ＮＣ的剩余强度明显降低，骤冷导致瞬间有巨大的温度梯度和较大的热应力，但这并不是引起混凝土爆裂的主要原因，在经历高温后，与ＮＣ相比，ＨＰＣ的孔隙率有更为显著的增大，累积孔径分布也有更明显的变化，随着最高暴露温度的增大，不同冷却制度所带来 |
| 关键词: 高性能混凝土 高温 孔结构 |
| DOI： |
| 分类号:TU528.31 |
| 基金项目:国家自然科学基金!资助重点项目 ( 5 993 81 70 ) |
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| High Temperature Properties of High Performance Concrete |
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Sammy Yin Nin Chan SUN Wei LUO Xin Sammy Yin Nin Chan
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| Abstract: |
| Residual mechanical property and the corresponding pore structure of high performance concrete(HPC) after being subjected to different high temperatures and cooling regimes were studied and compared with normal concrete(NC).Test results denoted that residual strength of both HPC and NC dropped significantly after exposure to high temperatures.Thermal stress resulted from thermal shock such as rapid cooling was not a predominant factor causing concrete to spall.Porosity in HPC increased much more than that in NC after being exposed to high temperatures.Difference of the cumulative pore volume of the concrete subjected to the different cooling regimes was reduced with increase of temperature. |
| Key words: high performance concrete,high temperature,pore structure, |
