Effect of hybrid fiber on crack resistance of concrete
In order to explore the impact of hybrid fiber on concrete cracking resistance,the advantages of high molecular weight polyethylene(UHMWPE)fiber with large elastic modulus and good toughness are selected to prevent the expansion of cracks inside concrete and the formation of macro cracks,and the advantages of steel fiber with good tensile,flexural and shear properties are selected to improve the cracking resistance of concrete.The dry shrinkage rate and early cracking of concrete were tested by different fiber content,single and compound mixing methods.The results show that when UHMWPE fibers are mixed with steel fibers,the optimal fiber content for the drying shrinkage performance of concrete is 0.2％,and when the proportion of steel fibers is 75％,the 28 day cracking shrinkage rate is reduced by 60.7％compared to reference group,and the overall reduction rate is lower than that of single fiber reinforced concrete.Both composite and single fiber addition significantly improve the crack resistance per-formance of concrete,with the best effect achieved when composite is added,there are almost no cracks generated.
万方数据
维普
