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时间:2020-04-19
《高性能水泥基灌浆料高温后抗压强度退化规律.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、昂i,面朱0期矩T蜕材料芋报Vo1.17,NO.32014年6月J0URNALoFBUILDINGMATERIALSJun.,2014文章编号:1007—9629(2014)03—0470-05高性能水泥基灌浆料古同皿日后抗压强度退化规律袁广林,李青,李庆涛●张倩茜(1.中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221008;2.中国矿业大学力学与建筑工程学院,江苏徐州221008;3.大地工程开发(集团)有限公司选煤设计研究院,天津300381)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
2、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;静置时间中图
3、分类号:TU528.01文献标志码:Adoi:10.3969/i.issn.1007—9629.2014.03.018DegradationofCompressiveStrengthofHigh—PerformanceCementitiousGroutingMaterialafterExposuretoHighTemperatureYUANGuanglin~,LIQing,LIQingtao,ZHANGQianqian。(1.JiangsuKeyLaboratoryofEnvironmentalImpactandStructural
4、SafetyinEngineering,ChinaUniversityofMiningandTechnology,Xuzhou221008,China;2.SchoolofMechanicsandCivilEngineering,ChinaUniversityofMiningandTechnology,Xuzhou221008。China3.CoalSeparationDesignInstituteDadiEngineeringDevelopment(Group)Co.,Ltd.,Tianjin300381,China)Abstra
5、ct:Compressivestrengthofcementitiousgroutingmaterialwithdifferentwateradditionratiosafterexposuretovarioushightemperaturesandcooledbydifferentcoolingmethodsforspecifictimeswasinves—tigated.Theresultsshowthatthecompressivestrengthofcementitiousgroutingmaterialwith12(bym
6、ass)wateraddedissignificantlyhigherthanthatwith14%and16wateradded.Thecompressivestrengthofthecubespecimenofthecementitiousgroutingmaterialdecreaseswiththerisingofheatingtemperature.Thecubecompressivestrengthafterexposuretofirechangessignificantlyintheearlystage,butitte
7、ndstobestablewithtime.Comparedwiththecubescooledbynaturalcoolingmethod,thecorn—pressivestrengthofthosecooledbysprayingwatercoolingmethodcanberecoveredmorewithexposuretemperaturerising.Theresultsprovidesomereferencesforthesafetyassessmentafterexposuretofireofthestructur
8、esreinforcedbyusinghigh—performancecementitiousgroutingmateria1.Keywords:cementitiousgroutingmaterial;hightemperature
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