摘   要：针对工程中的硫酸盐侵蚀和再生混凝土耐久性问题，利用玄武岩纤维的增强和耐腐蚀特性，对玄武岩纤维再生混凝土的抗硫酸盐腐蚀性能进行研究，分析了不同再生骨料取代率和玄武岩纤维掺量对再生混凝土的抗硫酸盐腐蚀性能的影响，对比分析了不同干湿循环次数后混凝土的抗压强度、弹性模量和峰值应变变化情况，得到了再生混凝土硫酸盐侵蚀后的破坏形式和力学参数。引入叠加效应系数K分析了再生混凝土荷载-位移全过程曲线及其破坏机理。结果表明，再生骨料取代率和玄武岩纤维掺量明显影响受硫酸盐侵蚀后混凝土的抗压强度，但对弹性模量的影响较小；硫酸盐侵蚀对混凝土界面过渡区造成的影响使得立方体试件和圆柱体试件的破坏模式差别较大。同时发现，掺入纤维可显著提高再生混凝土峰值应变及变形能力，但对其弹性模量的提高影响较小。通过K值的引入和计算发现，掺入纤维和冻融循环次数的增加会降低纤维再生混凝土的抗硫酸盐侵蚀性能。

Abstract: The effects of different recycled aggregate replacement rate and basalt fiber content on the sulfate resistance of recycled concrete were studied. The compressive strength, elastic modulus and peak strain of concrete after different dry - wet cycles were compared and analyzed, and the failure mode and mechanical parameters of the recycled concrete after sulfate attack were obtained. The coefficient K of combined effect was induced to characterize the superimposed effect of mixing basalt fiber and sulfate erosion. The results show that the recycled aggregate and basalt fiber content significantly affect the compressive strength of concrete after sulfate attack, but have little effect on elastic modulus. The effect of sulfate attack on concrete interface transition zone makes the failure modes of of cubic and cylinder test piece is quite different. At the same time, it was found that the incorporation of fiber can significantly improve the peak strain and deformation capacity of recycled concrete, but it has little effect on the improvement of elastic modulus. Through the introduction and calculation of the K value, it is found that the increase of fiber and freeze-thaw cycles reduce the sulfate attack resistance of recycled concrete.