| 摘要: |
| 对掺水率不同的水泥基灌浆料的立方体抗压强度在受火温度、静置时间及冷却方式均不同的条件下进行试验研究.结果表明：无论是自然冷却还是喷水冷却，掺水率为12%（质量分数，下同）的水泥基灌浆料受火后的立方体抗压强度明显高于掺水率为14%，16%的灌浆料；水泥基灌浆料受高温或火灾作用后，其立方体抗压强度随温度的升高总体呈下降趋势；火灾作用后水泥基灌浆料立方体抗压强度在静置前期波动较大，随着时间的推移逐渐趋于稳定；随着受火温度的升高，水泥基灌浆料立方体抗压强度喷水冷却较自然冷却恢复程度提高.研究成果可为高性能水泥灌浆料加固结构物火灾后的安全性评估提供参考. |
| 关键词: 水泥基灌浆料 高温 抗压强度 静置时间 |
| DOI：103969/j.issn1007 9629201403018 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51208504）；教育部博士点基金资助项目（20120095110027）；江苏省优势学科建设工程项目 |
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| Degradation of Compressive Strength of High Performance CementitiousGrouting Material after Exposure to High Temperature |
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YUAN Guanglin1, LI Qing1, LI Qingtao2, ZHANG Qianqian3
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1.Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology, Xuzhou 221008, China;2.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221008, China;3.Coal Separation Design Institute Dadi Engineering DevelopmentGroup Co., Ltd., Tianjin 300381, China
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| Abstract: |
| Compressive strength of cementitious grouting material with different water addition ratios after exposure to various high temperatures and cooled by different cooling methods for specific times was investigated. The results show that the compressive strength of cementitious grouting material with 12%(by mass)water added is significantly higher than that with 14%and 16%water added. The compressive strength of the cube specimen of the cementitious grouting material decreases with the rising of heating temperature. The cube compressive strength after exposure to fire changes significantly in the early stage， but it tends to be stable with time. Compared with the cubes cooled by natural cooling method， the compressive strength of those cooled by spraying water cooling method can be recovered more with exposure temperature rising. The results provide some references for the safety assessment after exposure to fire of the structures reinforced by using high performance cementitious grouting material. |
| Key words: cementitious grouting material high temperature compressive strength standing time |
