Arredondo Susana P, Corral Ramón, Valenciano A, Rosas Carlos A, Gómez Jose M, Medina Teresita J, Soto Magnolia, Bernal Jesús M
Faculty of Engineering, Autonomous University of Sinaloa, Los Mochis 81223, Mexico.
Barcelona School of Building Construction, Polytechnic University of Catalonia, 08028 Barcelona, Spain.
Polymers (Basel). 2022 Mar 20;14(6):1248. doi: 10.3390/polym14061248.
The current geopolymers have limited mechanical strength against the effect of tension, which makes them susceptible to brittle failure. However, owing to their potential as a sustainable construction material, there is growing interest in improving the poor mechanical properties of geopolymers. This study experimentally investigated crucial properties of polypropylene-fiber-reinforced fly ash-based geopolymer composites. The effects of polypropylene fibers (PPF) addition (0.5%, 1.0% and 1.5% by volume) on the mechanical properties of the geopolymer composites were investigated with respect to compressive and flexural strength, deformation behavior of Young's and shear moduli, and resilience capacity. In addition, scanning electron microscopy was performed to establish the morphology of the geopolymeric matrix and the fiber-matrix interfacial interaction. The addition of PPF significantly increased the flexural strength: compared with the control, at 7 days it was 27% greater for the 0.5% PPF composite and 65% greater for the 1.0% PPF composite. By 14 days it was 31% and 61% greater, respectively. By contrast, the 1.5% PPF composite had lower strength parameters compared with the control because the fiber dispersion increased the porosity. Similar trends were seen for resilience. The SEM observations showed the dispersion of the fibers and helped elucidate the fiber-matrix interaction mechanism.
当前的地质聚合物在抵抗拉伸作用方面的机械强度有限，这使得它们容易发生脆性破坏。然而，由于其作为可持续建筑材料的潜力，人们对改善地质聚合物较差的机械性能的兴趣日益浓厚。本研究通过实验研究了聚丙烯纤维增强粉煤灰基地质聚合物复合材料的关键性能。研究了聚丙烯纤维（PPF）添加量（体积分数分别为0.5%、1.0%和1.5%）对地质聚合物复合材料机械性能的影响，包括抗压强度、抗弯强度、杨氏模量和剪切模量的变形行为以及回弹能力。此外，还进行了扫描电子显微镜观察，以确定地质聚合物基体的形态以及纤维与基体的界面相互作用。PPF的添加显著提高了抗弯强度：与对照组相比，在7天时，0.5%PPF复合材料的抗弯强度提高了27%，1.0%PPF复合材料提高了65%。到14天时，分别提高了31%和61%。相比之下，1.5%PPF复合材料的强度参数低于对照组，因为纤维分散增加了孔隙率。回弹性能也呈现类似趋势。扫描电子显微镜观察显示了纤维的分散情况，并有助于阐明纤维与基体的相互作用机制。
