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引用本文:	邓宗才,刘国平,杜超超,施慧聪.新型粗聚烯烃纤维高性能混凝土弯曲韧性[J].建筑材料学报,2014,17(2):228-233

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新型粗聚烯烃纤维高性能混凝土弯曲韧性
邓宗才¹, 刘国平², 杜超超¹, 施慧聪²
1.北京工业大学城市与重大工程安全减灾省部共建重点实验室，北京100124;2.上海罗洋新材料科技有限公司，上海200120

摘要:

基于美国ASTM C1550标准，采用圆板试件研究了新型粗聚烯烃纤维混凝土的弯曲韧性，探讨了纤维掺量和纤维长度对纤维混凝土板能量吸收值的影响规律.通过与梁弯曲韧性试验方法的比较，发现圆板试验更加适合评价粗合成纤维混凝土的弯曲韧性.随着粗聚烯烃纤维掺量、纤维长度的增加，纤维混凝土板的能量吸收值逐渐提高.按照日本JSCE SF4韧性评价方法，掺量为6，8，11kg/m3的粗聚烯烃纤维混凝土梁的韧性指标，比相同掺量的中等弹模纤维增强混凝土分别提高了101%，68%，76%，比掺量为156kg/m3的钢纤维增强混凝土分别提高了65%，90%，138%.

关键词: 粗聚烯烃纤维弯曲韧性韧性指标

DOI：103969/j.issn1007 9629201402008

分类号:

基金项目:国家自然科学基金资助项目(51378032)；教育部博士点基金资助项目(20131103110017)

Flexural Toughness of a New Kind of Macro polyolefin FiberReinforced High Performance Concrete

DENG Zongcai¹, LIU Guoping², DU Chaochao¹, SHI Huicong²

1.Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology,Beijing 100124, China;2.Shanghai Royang Innovative Material Technologies Co. Ltd., Shanghai 200120, China

Abstract:

Based on the standard of ASTM C1550, test of circular plate was for the first time introduced in China to examine the effect of a new kind of macro polyolefin fiber on the flexural toughness of fiber reinforced concrete plate. Compared with the flexural toughness test of beams, it is shown that the test of circular plates is more suitable to evaluate the flexural toughness of macro synthetic fiber reinforced concrete. The energy absorbtion value increases with increase in fiber length and volume. Applying the evaluation system of Japan JSCE SF4, for the same fiber quantity 6, 8, 11kg/m3, the flexural toughness index of polyolefin fiber reinforced concrete was increased by 101%, 68%, 76% higher than that of mid elastic modular fiber respectively and 65%, 90%, 138% higher than that of 156kg/m3 steel fiber.

Key words: macro polyolefin fiber flexural toughness flexural toughness index