【摘要】 以环氧树脂E51为基体材料，丙酮为稀释剂，通过添加玄武岩纤维，制备出了玄武岩纤维/树脂基复合混凝土，探究了玄武岩纤维掺杂量对复合混凝土的力学性能和抗冻性能的影响。结果表明，掺入适量玄武岩纤维后，复合混凝土宏观裂纹数量减少，玄武岩纤维在混凝土中横纵交错分布，与凝胶和骨料结合紧密，混凝土的力学性能得到了显著提高。随着玄武岩纤维掺杂量的增多，复合混凝土的抗压强度、抗折强度和相对动弹性模量均先升高后轻微降低，质量损失率先减小后增大。当玄武岩纤维掺杂量为0.60%(体积分数)时，复合混凝土的抗压强度和抗折强度均达到最大值，分别为41.63和8.90 MPa,在冻融循环100次时，相对动弹性模量最大为59.54%,质量损失率最低为1.02%,其力学性能和抗冻性能最佳。通过对质量损失率和相对动弹性模量进行曲线拟合分析可知，相对动弹性模量对于冻融循环的敏感程度更高，更适合用于评估混凝土的使用寿命，测试出玄武岩纤维的掺杂量为0.60%(质量分数)的混凝土的预估寿命可达9.84年，较未掺杂的试样提高了51.38%。综合可知，玄武岩纤维的最佳掺杂量为0.60%(体积分数)。更多还原

【Abstract】 Using epoxy resin E51 as the matrix material and acetone as the diluent, basalt fiber/resin based composite concrete was prepared by adding basalt fibers. The influence of basalt fiber doping amount on the mechanical properties and frost resistance of the composite concrete was investigated. The results showed that the number of macro cracks in the composite concrete was reduced after adding proper amount of basalt fiber. The basalt fiber was distributed in the concrete crosswise and lengthways, closely combined with gel and aggregate, and the mechanical properties of the concrete were significantly improved. With the increase of basalt fiber doping, the compressive strength, flexural strength, and relative dynamic elastic modulus of composite concrete first increased and then slightly decreased, and the mass loss first decreased and then increased. When the content of basalt fiber doping was 0.60 vol%, the compressive strength and flexural strength of composite concrete reached their maximum values, which were 41.63 and 8.90 MPa, respectively. After 100 freeze-thaw cycles, the maximum relative dynamic elastic modulus was 59.54%, and the minimum mass loss rate was 1.02%. Its mechanical and frost resistance properties were the best. Through curve fitting analysis of the mass loss rate and the relative dynamic modulus of elasticity, it could be concluded that the relative dynamic modulus of elasticity was more sensitive to freeze-thaw cycles and more suitable for evaluating the service life of concrete. The estimated lifespan of concrete with a 0.60 vol% doping content of basalt fibers tested could reach 9.84 years, which was 51.38% higher than that of the undoped sample. Overall, the optimal doping amount for basalt fibers was 0.60 vol%.更多还原