Concrete with discrete slender elements from mechanically recycled wind turbine blades
Concrete with discrete slender elements from mechanically recycled wind turbine blades
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DOI：
10.1016/j.resconrec.2017.08.005
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发表时间：
2018
影响因子：
13.2
通讯作者：
Ardavan Yazdanbakhsh;L. Bank;K. Rieder;Yuan Tian;Chen Chen-Chen
中科院分区：
文献类型：
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作者：
Ardavan Yazdanbakhsh;L. Bank;K. Rieder;Yuan Tian;Chen Chen-Chen
一种由玻璃纤维增强聚合物（GFRP）复合材料制成的风力涡轮机叶片外壳，通过机械加工成细长的“针”。在混凝土混合物中，针被用来替代5%和10%的粗骨料（按体积计算），这些粗骨料被用来测试新混凝土和硬化混凝土的一些重要特性。结果表明，针剂对新拌混凝土的稳定性和和易性没有负面影响。虽然针的掺入对混凝土的抗压、抗拉和抗弯强度没有显著影响，但它导致混凝土的能量吸收能力（韧性）显著增加，从对照样品的1.2 J增加到替换10%针的33.3 J。聚合物燃烧测试表明，由于外壳被切割的方向，在大多数针状结构中，玻璃纤维垂直于针状结构轴，因此也垂直于针状结构所携带的拉伸应力。虽然纤维横向排列的“针”提高了混凝土的力学性能，但如果可以优化风叶片的切割方向，使大多数“针”的纤维主要纵向排列，预计改善效果会更显著。
A wind turbine blade shell made of glass fiber reinforced polymer (GFRP) composite materials was mechanically processed into slender elements referred to as “Needles”. The Needles were used to replace 5% and 10% of the coarse aggregate, by volume, in concrete mixtures that were tested to investigate a number of important properties of fresh and hardened concrete. It was found that the Needles did not affect the stability and workability of fresh concrete negatively. Although the incorporation of the Needles did not have a notable effect on compressive, tensile, and flexural strength of concrete, it resulted in a significant increase in energy absorption capacity (toughness) from 1.2 J in control specimens up to 33.3 J in those with 10% Needle replacement. A polymer burn-off test revealed that, due to the directions in which the shell was cut, in most of the Needles glass fibers were perpendicular to the Needle axis, and therefore to the tensile stress carried by the Needles. Although the Needles with transversely-aligned fibers improve the mechanical performance of concrete, if the cutting directions of wind blades can be optimized so that in the majority of the Needles the fibers are primarily aligned longitudinally, improvements are expected to be more significant.