Revilla-Cuesta Víctor, Espinosa Ana B, Serrano-López Roberto, Skaf Marta, Manso Juan M
Department of Civil Engineering, University of Burgos, 09001 Burgos, Spain.
Department of Construction, University of Burgos, 09001 Burgos, Spain.
Materials (Basel). 2024 Dec 23;17(24):6299. doi: 10.3390/ma17246299.
The glass fiber-reinforced polymer (GFRP) materials of wind turbine blades can be recovered and recycled by crushing, thereby solving one of the most perplexing problems facing the wind energy sector. This process yields selectively crushed wind turbine blade (SCWTB), a novel waste that is almost exclusively composed of GFRP composite fibers that can be revalued in terms of their use as a raw material in concrete production. In this research, the fresh and mechanical performance of concrete made with 1.5%, 3.0%, 4.5%, and 6.0% SCWTB is studied. Once incorporated into concrete mixes, SCWTB waste slightly reduced slumps due to the large specific surface area of the fibers, and the stitching effect of the fibers on mechanical behavior was generally adequate, as scanning electron microscopy demonstrated good fiber adhesion within the cementitious matrix. Thus, despite the increase in the content of water and plasticizers when adding this waste to preserve workability, the compressive strength only decreased in the long term with the addition of 6.0% SCWTB, a value of 45 MPa always being reached at 28 days; Poisson's coefficient remained constant from 3.0% SCWTB; splitting tensile strength was maintained at around 4.7 MPa up to additions of 3.0% SCWTB; and the flexural strength of mixes containing 6.0% and 1.5% SCWTB was statistically equal, with a value near 6.1 MPa. Furthermore, all mechanical properties of the concrete except for flexural strength were improved with additions of SCWTB compared to raw crushed wind turbine blade, which apart from GFRP composite fibers contains approximately spherical polymer and balsa wood particles. Flexural strength was conditioned by the proportion of fibers, their dimensions, and their strength, which were almost identical for both waste types. SCWTB would be preferable for applications in which compression stresses predominate.
风力涡轮机叶片的玻璃纤维增强聚合物（GFRP）材料可以通过粉碎进行回收再利用，从而解决风能领域面临的最棘手问题之一。这一过程产生了选择性粉碎的风力涡轮机叶片（SCWTB），这是一种新型废料，几乎完全由GFRP复合纤维组成，这些纤维作为混凝土生产的原材料具有再利用价值。在本研究中，对掺入1.5%、3.0%、4.5%和6.0% SCWTB的混凝土的新拌性能和力学性能进行了研究。一旦掺入混凝土混合料中，由于纤维的比表面积大，SCWTB废料会使坍落度略有降低，并且纤维对力学性能的增强作用总体上是足够的，因为扫描电子显微镜显示纤维在胶凝基质中有良好的粘结性。因此，尽管添加这种废料时为保持工作性而增加了水和塑化剂的用量，但长期来看，仅在添加6.0% SCWTB时抗压强度有所下降，28天时始终能达到45 MPa；从添加3.0% SCWTB起泊松系数保持不变；在添加量达到3.0% SCWTB之前，劈裂抗拉强度维持在4.7 MPa左右；含有6.0%和1.5% SCWTB的混合料的抗弯强度在统计上相等，值接近6.1 MPa。此外，与原始粉碎的风力涡轮机叶片相比，添加SCWTB后，混凝土的所有力学性能（除抗弯强度外）均得到改善，原始粉碎的风力涡轮机叶片除了GFRP复合纤维外，还含有近似球形的聚合物和轻木颗粒。抗弯强度取决于纤维的比例、尺寸和强度，这两种废料类型的这些参数几乎相同。对于以压应力为主的应用，SCWTB将更可取。
