余 阳,夏冬桃,吴伟波,熊思慧,魏贵添
钢纤维橡胶路面混凝土力学性能研究
余 阳,夏冬桃,吴伟波,熊思慧,魏贵添
摘 要:为提高普通混凝土路面的早期强度、抗弯性能,缩短养护时间,运用正交试验方法对9组钢纤维橡胶路面混凝土和一组普通混凝土试件分别进行了龄期3d和28d抗压强度和抗折强度试验,通过直观分析和方差分析,考察各因素对路面混凝土抗压和抗折强度的影响。结果表明,修补剂、钢纤维、40目橡胶粉在低掺量下,钢纤维橡胶路面混凝土的最佳配比为修补剂掺量15%,钢纤维体积率0.5%,橡胶粉掺量5.0%。修补剂对钢纤维橡胶路面混凝土的抗压和抗折强度影响最大,最高可提高强度的68.6%;钢纤维对抗折强度的影响程度高于橡胶粉;钢纤维和橡胶粉对抗压强度无明显影响,加入适量的钢纤维和橡胶粉可提高混凝土的抗折强度及弯曲韧性。
Abstract: In order to improve the early strength and flexural performance of ordinary concrete pavement, and shorten curing time, compressive strength and flexural strength experiment for 3d and 28d of 9 groups of steel fiber reinforced rubber pavement concrete specimens and a set of common concrete specimen were carried out by orthogonal experiment method. Through the intuitive analysis and variance analysis, the influence of various factors on compressive and flexural strength of pavement concrete were investigated. The results showed that, at low dosages of repairing adhesive, steel fiber and 40 mesh rubber powder, the best proportion of steel fiber reinforced rubber pavement concrete for repairing adhesive content was 15%, steel fiber volume rate was 0.5%, and rubber powder content was 5.0%. The largest effects on compressive strength and flexural strength of steel fiber reinforced pavement concrete is repairing adhesive, the largest strength can be increased by 68.6%. The influence degree of steel fiber on flexural strength is higher than rubber powder, steel fiber and rubber powder had no significant effect for compressive strength, and adding suitable amount of fiber and rubber powder can improve flexural strength and flexural toughness of concrete.
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