In this work, stress variations during flexure of early age basalt fiber reinforced concrete beams were studied using high resolution temporal measurements. An experimental system was created to collect stress-time curves at 100 kHz sampling rate so that temporal profiles of stress variations were analyzed in detail. Stress drops were modeled as avalanches resulting from interactions between basalt fibers and cementitious matrices. Four-point bending tests at different loading rates were conducted to investigate avalanches during flexure of beams with different fiber volume fractions. Good agreement was obtained between measured avalanche statistics or dynamics and predictions from the mean field model. Different types of avalanches were detected during the flexure of basal fiber reinforced concrete beams, including avalanches with limited size and durations collapsed onto the scaling regime in the logarithmic scale, avalanches with an incubation period before stress drops beyond the scaling regime and giant avalanches occurred at the fracture of bottom concrete. Observations of different avalanche types disclosed the critical failure evolution during flexure of basalt fiber reinforced beams, which could lead to the creation of durable ecofriendly fiber-reinforced concrete structures.

在这项工作中，使用高分辨率的时间测量方法研究了早期玄武岩纤维增强混凝土梁弯曲过程中的应力变化。创建了一个实验系统来收集100 kHz采样率下的应力-时间曲线，以便详细分析应力变化的时间分布。将应力降建模为玄武岩纤维与水泥基体相互作用产生的雪崩。进行了在不同加载速率下的四点弯曲测试，以研究具有不同纤维体积分数的梁在弯曲过程中的雪崩。在测量的雪崩统计数据或动力学与平均场模型的预测之间获得了良好的一致性。在基础纤维增强混凝土梁弯曲期间检测到不同类型的雪崩，包括尺寸和持续时间有限的雪崩以对数尺度坍塌到结垢状态，在应力下降到超过结垢状态之前潜伏期的雪崩和底部混凝土的断裂处发生了巨大的雪崩。对不同类型雪崩的观察揭示了玄武岩纤维增强梁弯曲过程中的关键破坏演化，这可能导致创建耐用的环保型纤维增强混凝土结构。