Concrete is a material with high compressive strength, but predisposed to shrinkage cracking, rapid cracks propagation, and brittle failures. The incorporation of fibre is an acceptable solution to reduce these limitations. However, high cost and energy consumption related to man-made fibres have placed natural fibres as an attractive sustainable alternative, especially considering that different natural fibres are industrial waste (as the Eucalyptus globulus bark fibre). Still, natural fibres can produce an important reduction of concrete strength. Hence, the objective of this study is to evaluate the effects of Eucalyptus globulus bark fibre in traditional concrete mechanical properties as compressive and flexural strength. For this, an experimental program was developed in such a way that reduces the results uncertainties and increases the power of decision regarding the percentage and fibre conditions of the samples. The results indicate that, unlike other natural fibres, the traditional mechanical properties have a slight reduction and acceptable workability. This fact is more evident in the samples with 0.50% fibre with respect to the weight of cement. Therefore, reinforcing mortars and concrete with Eucalyptus globulus bark fibres emerges as an eco-friendly building alternative to reuse this industrial waste.

中文翻译：

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蓝桉树皮纤维增强混凝土力学性能评价

混凝土是一种具有高抗压强度的材料，但容易发生收缩开裂、裂纹快速扩展和脆性破坏。加入纤维是减少这些限制的可接受的解决方案。然而，与人造纤维相关的高成本和能源消耗使天然纤维成为一种有吸引力的可持续替代品，特别是考虑到不同的天然纤维是工业废料（如蓝桉树皮纤维）。尽管如此，天然纤维仍会显着降低混凝土强度。因此，本研究的目的是评估蓝桉树皮纤维对传统混凝土力学性能（如抗压和抗弯强度）的影响。为了这，以这样一种方式开发了一个实验程序，以减少结果的不确定性并增加关于样品百分比和纤维状况的决定能力。结果表明，与其他天然纤维不同，传统的机械性能略有下降，可加工性尚可。这一事实在相对于水泥重量为 0.50% 的样品中更为明显。因此，用蓝桉树皮纤维加固砂浆和混凝土成为一种环保建筑替代品，可以再利用这种工业废物。这一事实在相对于水泥重量为 0.50% 的样品中更为明显。因此，用蓝桉树皮纤维加固砂浆和混凝土成为一种环保建筑替代品，可以再利用这种工业废物。这一事实在相对于水泥重量为 0.50% 的样品中更为明显。因此，用蓝桉树皮纤维加固砂浆和混凝土成为一种环保建筑替代品，可以再利用这种工业废物。