Salamat-Talab Mazaher, Zeinolabedin-Beygi Ali, Soltani Faraz, Akhavan-Safar Alireza, Carbas Ricardo J C, da Silva Lucas F M
Department of Mechanical Engineering, Arak University of Technology, Arak 3818146763, Iran.
Department of Mechanical Engineering, Tarbiat Modares University, Tehran 1411713116, Iran.
Materials (Basel). 2024 Apr 29;17(9):2094. doi: 10.3390/ma17092094.
This study experimentally investigates the influence of metal chips and glass fibers on the mode I fracture toughness, energy absorption, and tensile strength of polymer concretes (PCs) manufactured by waste aggregates. A substantial portion of the materials employed in manufacturing and enhancing the tested polymer concrete are sourced from waste material. To achieve this, semi-circular bend (SCB) samples were fabricated, both with and without a central crack, to analyze the strength and fracture behavior of the composite specimens. The specimens incorporated varying weight percentages comprising 50 wt% coarse mineral aggregate, 25 wt% fine mineral aggregate, and 25 wt% epoxy resin. Metal chips and glass fibers were introduced at 2, 4, and 8 wt% of the PC material to enhance its mechanical response. Subsequently, the specimens underwent 3-point bending tests to obtain tensile strength, mode I fracture toughness, and energy absorption up to failure. The findings revealed that adding 4% brass chips along with 4% glass fibers significantly enhanced energy absorption (by a factor of 3.8). However, using 4% glass fibers alone improved it even more (by a factor of 10.5). According to the results, glass fibers have a greater impact than brass chips. Introducing 8% glass fibers enhanced the fracture energy by 92%. However, in unfilled samples, aggregate fracture and separation hindered crack propagation, and filled samples presented added barriers, resulting in multiple-site cracking.
本研究通过实验研究了金属屑和玻璃纤维对由废弃骨料制成的聚合物混凝土（PC）的I型断裂韧性、能量吸收和拉伸强度的影响。制造和增强测试聚合物混凝土所使用的大部分材料均来自废料。为此，制作了带有和不带有中心裂纹的半圆弯曲（SCB）试样，以分析复合试件的强度和断裂行为。试件包含不同重量百分比，其中粗矿物骨料占50 wt%，细矿物骨料占25 wt%，环氧树脂占25 wt%。以PC材料的2%、4%和8 wt%引入金属屑和玻璃纤维，以增强其力学响应。随后，对试件进行三点弯曲试验，以获得拉伸强度、I型断裂韧性以及直至破坏的能量吸收。研究结果表明，添加4%的黄铜屑和4%的玻璃纤维可显著提高能量吸收（提高3.8倍）。然而，单独使用4%的玻璃纤维能使其提高得更多（提高10.5倍）。根据结果，玻璃纤维的影响比黄铜屑更大。引入8%的玻璃纤维可使断裂能提高92%。然而，在未填充的试样中，骨料的断裂和分离阻碍了裂纹扩展，而填充试样则增加了阻碍，导致多处开裂。
