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研究了碳纤维对C80高强高性能混凝土工作性能、力学性能和早期抗裂性能的影响,并对比了不同纤维对混凝土抗压强度的影响。结果表明:碳纤维掺量过大会显著增加高强高性能混凝土的减水剂用量并降低拌合物性能,其最大体积掺量不宜超过0.2%。钢纤维能在一定程度上提高高强高性能混凝土的抗压强度,而碳纤维、玄武岩纤维等短切纤维对混凝土的抗压强度没有显著影响。碳纤维可以有效抑制高强高性能混凝土的塑性开裂,早期抗裂等级最高可以达到Ⅴ级。
The effect of carbon fiber on the workability, mechanical properties and early crack resistance of C80 high strength and high performance concrete was studied. The effect of different fibers on the compressive strength of concrete was also compared. The results show that: when the content of carbon fiber is too large, the amount of superplasticizer of HSRH concrete is significantly decreased and the performance of the mixture is reduced; the maximum volume content should not exceed 0.2%. Steel fiber can improve the compressive strength of high-strength high-performance concrete to a certain extent, while the short-cut fiber such as carbon fiber and basalt fiber has no significant effect on the compressive strength of concrete. Carbon fiber can effectively restrain the plastic cracking of high strength and high performance concrete, and the early crack resistance grade can reach Ⅴ grade.