新型粗聚烯烃纤维高性能混凝土弯曲韧性  

Flexural Toughness of a New Kind of Macro-polyolefin Fiber Reinforced High Performance Concrete

作　　者：邓宗才[1] 刘国平 杜超超[1] 施慧聪 

机构地区：[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

出　　处：《建筑材料学报》2014年第2期228-233,共6页Journal of Building Materials

基　　金：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)

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%.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 rein- forced concrete plate. Compared with the flexural toughness test of beams, it is shown that the test of cir- cular 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, 11 kg/ma, 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 15.6 kg/ma steel fiber.

关 键 词：粗聚烯烃纤维 弯曲韧性 韧性指标 

分 类 号：TU528.572[建筑科学—建筑技术科学]