为了研究玄武岩纤维再生混凝土梁在复合盐侵蚀和持续荷载耦合条件下的抗弯性能，对不同复合盐侵蚀时长（0、30、60、90 d）和不同持续应力荷载（0、0.25、0.5）的10根梁进行四点弯曲试验，通过分形理论对梁表面的裂缝开展形态和分布特征定量分析，并且采用灰色模型GM（1，1）对不同复合盐侵蚀时长下梁的抗弯性能进行预测。结果表明：玄武岩纤维再生混凝土梁表面裂缝的分形维数变化区间为［0.833，1.201］，并且裂缝开展满足分形特征，具有自相似性；发现分形维数与荷载等级、跨中挠度分别呈对数函数关系和logistic函数关系；GM（1，1）模型预测精度均符合I级，极限承载力、跨中挠度以及分形维数的最大相对误差分别为0.48%、4.26%和0.60%，并且对未来复合盐侵蚀时长试验梁进行抗弯性能有效预测。

In order to study the flexural performance of basalt fiber recycled concrete beams under the coupled conditions of composite salt erosion and sustained loading, four-point bending tests were carried out on 10 beams with different composite salt erosion durations (0, 30, 60, and 90 days) and different sustained stress loads (0, 0.25, and 0.5), and the cracks on the surface of the beams were quantitatively analyzed in terms of their morphology and distributional characteristics through the fractal theory and were predicted using the GM (1, 1) prediction model was used to predict the flexural performance of the beams under different composite salt erosion durations. The results show that the fractal dimension of the surface cracks of basalt fiber recycled concrete beams varies in the interval between ［0.833, 1.201］ and the cracks carry out to satisfy the fractal characteristics with self-similarity. It is found that the fractal dimension is in a logarithmic function relationship and logistic function relationship with the load ratings and mid-span deflections, respectively. The prediction accuracy of the GM (1, 1) model all complied with Class I. The maximum relative errors of ultimate bearing capacity, mid-span deflection, and fractal dimension were 0.48%, 4.26%, and 0.60%, respectively, and were effective in predicting the flexural performance of the future composite salt erosion time-length test beams.