高温下复掺纤维RPC立方体抗压性能研究  

Compressive Properties of Cubes Reactive Powder Concrete with Hybrid Fibers at Elevated Temperature

作　　者：郑文忠[1] 罗百福[1] 王英[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《湖南大学学报（自然科学版）》2012年第11期13-19,共7页Journal of Hunan University:Natural Sciences

基　　金：教育部长江学者奖励计划资助项目(2009-37);教育部博士点基金资助项目(20092302110046);黑龙江省自然科学基金资助项目(E200916);哈尔滨工业大学'985工程'优秀科技创新团队建设项目

摘　　要：完成了108个70.7mm×70.7mm×70.7mm复掺纤维活性粉末混凝土(RPC)立方体试块高温下抗压试验.考察了聚丙烯纤维(PPF)和钢纤维复掺对RPC高温爆裂的抑制效果,研究了温度和复掺纤维掺量对高温下RPC立方体抗压性能的影响.结果表明:体积掺量2%的钢纤维和0.2%的PPF复掺能有效防止RPC爆裂,高温下立方体RPC的抗压强度也相对较高.100℃时RPC的立方体抗压强度比常温低,200～500℃时立方体抗压强度相比100℃时有所升高,600～800℃时立方体抗压强度相对500℃时降低.若钢纤维掺量相同,则20～300℃时,立方体抗压强度随PPF掺量增大而降低;400～800℃时,立方体抗压强度随PPF掺量增大而提高.若PPF掺量相同,则20～100℃时,立方体抗压强度随钢纤维掺量的增大而提高;200～800℃时,立方体抗压强度随钢纤维掺量的增大而降低;100～400℃时复掺纤维RPC的立方体相对抗压强度低于普通混凝土和高强混凝土,400～800℃时复掺纤维RPC的相对抗压强度则较大.基于试验结果,拟合出了不同纤维掺量的RPC高温下立方体抗压强度随温度变化的计算公式.In order to study the compressive properties of reactive powder concrete（RPC） at elevated temperature,108 cube specimens（70.7 mm×70.7 mm×70.7 mm） were prepared to study the group compressive strength of RPC with polypropylene fibers（PPF） and steel fibers.The influences of temperatures,hybrid fibers content and explosive spalling principles were investigated.The experiment results show that a PPF volume content of 0.2% and a steel fiber volume content of 2% can prevent the explosive spalling of RPC and significantly increase cube compressive strength.The cube compressive strength decreased at 100℃,compared to 20℃ and increased from 200℃ to 500℃ as compared to 100℃,but decreased after 600℃.The cube compressive strength of RPC was lower as the fibers content increased before 300℃,but was higher as fibers content increased beyond 300℃ when steel fibers was the same content.Cube compressive strength of RPC was higher as the steel fibers content increased before 100℃,but was lower as steel fibers content increased beyond 200℃ when PPF was the same content.Compared with the normal strength concrete and high strength concrete,the cube relative compressive strength of RPC was lower before 400℃,but was higher between 500℃ and 800℃.The calculation formula of cube compressive strength at elevated temperature was obtained by fitting the curve of experiment data considering hybrid fibers content as temperature varied.

关 键 词：高温下 活性粉末混凝土 抗压强度 爆裂 钢纤维 聚丙烯纤维 

分 类 号：TU528.57[建筑科学—建筑技术科学]