Abstract The mechanical behavior of earth concrete for sustainable construction has been studied in this paper. The effect of flax fibers on the fracture behavior has been monitored using digital image correlation (DIC) and acoustic emission (AE) techniques to better understand the fracture process and damage mechanism. Three-point bending tests have been conducted on prismatic specimens with different percentages (0%, 0.3% and 0.6%) and lengths (12 mm, 24 mm, 50 mm) of flax fibers. The AE activity and fracture energy increased with the percentage and length of fibers. Moreover, the AE signal parameters varied with the loading rate and different damage mechanisms have been distinguished. Crack opening resistance also increased due to the bridging effect of fibers along developed cracks. Those results show the benefits of adding flax fibers to enhance the ductility of earth concrete.

中文翻译：

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亚麻纤维增强土混凝土的断裂行为

摘要 本文研究了用于可持续建筑的土混凝土的力学行为。使用数字图像相关 (DIC) 和声发射 (AE) 技术监测亚麻纤维对断裂行为的影响，以更好地了解断裂过程和损伤机制。对具有不同百分比（0%、0.3% 和 0.6%）和长度（12 毫米、24 毫米、50 毫米）的亚麻纤维的棱柱状试样进行了三点弯曲试验。AE 活性和断裂能随着纤维百分比和长度的增加而增加。此外，AE 信号参数随加载速率而变化，并区分了不同的损坏机制。由于纤维沿着已发展的裂纹的桥接效应，开裂阻力也增加了。