Pawelska-Mazur Magdalena, Kaszynska Maria
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland.
Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, Al. Piastów 17, 70-310 Szczecin, Poland.
Materials (Basel). 2021 Jan 6;14(2):256. doi: 10.3390/ma14020256.
The presented research's main objective was to develop the solution to the global problem of using steel waste obtained during rubber recovery during the tire recycling. A detailed comparative analysis of mechanical and physical features of the concrete composite with the addition of recycled steel fibres (RSF) in relation to the steel fibre concrete commonly used for industrial floors was conducted. A study was carried out using micro-computed tomography and the scanning electron microscope to determine the fibres' characteristics, incl. the EDS spectrum. In order to designate the full performance of the physical and mechanical features of the novel composite, a wide range of tests was performed with particular emphasis on the determination of the tensile strength of the composite. This parameter appointed by tensile strength testing for splitting, residual tensile strength test (3-point test), and a wedge splitting test (WST), demonstrated the increase of tensile strength (vs unmodified concrete) by 43%, 30%, and 70% relevantly to the method. The indication of the reinforced composite's fracture characteristics using the digital image correlation (DIC) method allowed to illustrate the map of deformation of the samples during WST. The novel composite was tested in reference to the circular economy concept and showed 31.3% lower energy consumption and 30.8% lower CO emissions than a commonly used fibre concrete.
本研究的主要目标是针对轮胎回收过程中橡胶回收时产生的钢废料这一全球问题开发解决方案。对添加再生钢纤维（RSF）的混凝土复合材料与工业地面常用的钢纤维混凝土的机械和物理特性进行了详细的对比分析。利用微型计算机断层扫描和扫描电子显微镜进行了一项研究，以确定纤维的特性，包括能谱。为了确定新型复合材料物理和机械特性的全面性能，进行了广泛的测试，特别强调了复合材料抗拉强度的测定。通过劈裂抗拉强度试验、残余抗拉强度试验（三点试验）和楔形劈裂试验（WST）指定的该参数表明，与未改性混凝土相比，该复合材料的抗拉强度分别通过上述方法提高了43%、30%和70%。使用数字图像相关（DIC）方法对增强复合材料的断裂特性进行表征，能够展示WST过程中样品的变形图。参照循环经济概念对新型复合材料进行测试，结果表明，与常用纤维混凝土相比，其能耗降低了31.3%，二氧化碳排放量降低了30.8%。
