摘要
选用钢纤维、杜拉纤维和塑钢纤维,在总体积率不超过1%时,按二元或三元混杂制备混杂纤维增强高性能混凝土,并通过立方体标准试块的基本力学性能试验,研究了三种纤维的混杂方式以及混掺比例对混凝土抗压强度、劈拉强度以及拉压比的影响。研究结果表明,钢纤维-塑钢纤维-杜拉纤维三元混杂对混凝土的抗压强度影响并不明显,但能显著改善混凝土试块破坏时的延性;适宜比例的钢纤维、塑钢纤维与杜拉纤维混杂可显著改善基体混凝土的劈拉韧性,使劈拉强度提高30%~55%,拉压比增大到1/17~1/15;钢纤维/塑钢纤维/杜拉纤维体积掺量分别为0.7%、0.19%、0.11%时混杂纤维的复合增强效果最好,高性能混凝土拉压比达到1/15.1。
The steel fiber, modified polypropylene fiber and polypropylene fiber are used to be reinforcement in con- crete and the total volume fraction of hybrid fibers is not more than 1%. Based on the results of the compressive test and splitting tensile test, the effects of fiber volume fraction and hybrid mode on mechanical properties of the concrete are in- vestigated. The results show as follows： the use of the hybrid fibers have no significantly effect on the compressive strengthen of plain concrete, while it can improve the compressive toughness of plain concrete effectively; the mixture of the three different fibers in a suitable combination can more significantly improve the splitting toughness and the ration of tensile to compressive strength of the concrete with respectively increasing by 30%--55% and 1/17--1/15; when adding 0.7% steel fiber, 0.19% modified polypropylene fiber and 0.11% polypropylene fiber, the optimal result of hybrid fiber re- inforced high-performance concrete occurs, with the ratio between splitting tensile strength and compressive strength in- creasing to more than 1/15.1.
出处
《混凝土与水泥制品》
2015年第5期50-53,共4页
China Concrete and Cement Products
基金
国家自然科学基金委青年项目(51108164)
关键词
纤维增强高性能混凝土
抗压强度
劈拉强度
拉压比
Fiber reinforced high-performance concrete
Compressive strengthen
Splitting tensile strength
Ratio ofsplitting tensile strength to compressive strength
