【摘要】 为提高建筑垃圾及铁尾矿砂的回收利用率，试验研究了铁尾矿砂和玄武岩纤维对再生混凝土抗冻性能的影响。以再生混凝土的表面冻融损伤、质量损失率和强度损失率作为评判指标，借助扫描电子显微镜(SEM)分析其微观结构。结果表明，在再生混凝土中加入玄武岩纤维能提高其抗冻性能，且玄武岩纤维掺量对其影响较大，试验中纤维掺量为0.1%长度为18 mm的试件的冻融强度损失率最低；铁尾矿砂能够减缓再生混凝土的冻融损伤，当掺量低于30%时，再生混凝土的冻融损伤随铁尾矿砂掺量的增大而降低。玄武岩纤维和铁尾矿砂均能减缓再生混凝土的冻融损伤，在再生混凝土中适量加入纤维和铁尾矿砂能够提高其使用寿命，满足实际工程需要。更多还原

【Abstract】 In order to improve the recovery and utilization rate of construction waste and iron tailings, the effects of iron tailings and basalt fiber on the frost resistance of recycled concrete were studied. The surface freeze-thaw damage, mass loss rate and strength loss rate of recycled concrete were used as evaluation indexes. The microstructure of recycled concrete was analyzed by scanning electron microscopy(SEM). The results showed that adding basalt fiber to recycled concrete can improve its freezing-thawing resistance, and the content of basalt fiber has a great influence on it. In this test, the specimens with fiber content of 0.1% and length of 18 mm have the lowest freezing-thawing strength loss rate. Iron tailings can reduce the freeze-thaw damage of recycled concrete. When the content of iron tailings is less than 30%, the freeze-thaw damage of recycled concrete decreases with the increase of the content of iron tailings. Both basalt fiber and iron tail sand can reduce the freeze-thaw damage of recycled concrete. Adding fiber and iron tail sand to recycled concrete can improve its service life and meet the needs of practical engineering.更多还原