Tariq Hassan, Siddique Rao Muhammad Arsalan, Shah Syyed Adnan Raheel, Azab Marc, Qadeer Rizwan, Ullah Muhammad Kaleem, Iqbal Fahad
Department of Civil Engineering, Pakistan Institute of Engineering and Technology, Multan 66000, Pakistan.
College of Engineering and Technology, American University of the Middle East, Kuwait.
Polymers (Basel). 2022 Apr 27;14(9):1774. doi: 10.3390/polym14091774.
At present, low tensile mechanical properties and a high carbon footprint are considered the chief drawbacks of plain cement concrete (PCC). At the same time, the combination of supplementary cementitious material (SCM) and reinforcement of fiber filaments is an innovative and eco-friendly approach to overcome the tensile and environmental drawbacks of plain cement concrete (PCC). The combined and individual effect of fly ash (FA) and Alkali resistance glass fiber (ARGF) with several contents on the mechanical characteristics of M20 grade plain cement concrete was investigated in this study. A total of 20 concrete mix proportions were prepared with numerous contents of FA (i.e., 0, 10, 20, 30 and 40%) and ARGF (i.e., 0, 0.5, 1 and 1.5%). The curing of these concrete specimens was carried out for 7 and 28 days. For the analysis of concrete mechanical characteristics, the following flexural, split tensile, and compressive strength tests were applied to these casted specimens. The outcomes reveal that the mechanical properties increase with the addition of fibers and decrease at 30 and 40% replacement of cement with fly ash. Replacement of cement at higher percentages (i.e., 30 and 40) negatively affects the mechanical properties of concrete. On the other hand, the addition of fibers positively enhanced the flexural and tensile strength of concrete mixes with and without FA in contrast to compressive strength. In the end, it was concluded that the combined addition of these two materials enhances the strength and toughness of plain cement concrete, supportive of the application of an eco-friendly circular economy. The relationship among the mechanical properties of fiber-reinforced concrete was successfully generated at each percentage of fly ash. The R-square for general relationships varied from (0.48-0.90) to (0.68-0.96) for each percentage of FA fiber reinforced concrete. Additionally, the accumulation of fibers effectively boosts the mechanical properties of all concrete mixes.
目前，抗拉力学性能低和高碳足迹被认为是普通水泥混凝土（PCC）的主要缺点。同时，辅助胶凝材料（SCM）与纤维丝增强相结合是一种创新且环保的方法，可克服普通水泥混凝土（PCC）的拉伸和环境缺点。本研究考察了不同含量的粉煤灰（FA）和耐碱玻璃纤维（ARGF）对M20级普通水泥混凝土力学性能的综合及单独影响。共制备了20种混凝土配合比，其中粉煤灰含量分别为0、10%、20%、30%和40%，耐碱玻璃纤维含量分别为0、0.5%、1%和1.5%。这些混凝土试件养护7天和28天。为分析混凝土力学性能，对这些浇筑试件进行了以下抗弯、劈裂抗拉和抗压强度试验。结果表明，添加纤维可提高力学性能，而用粉煤灰替代30%和40%的水泥时力学性能会降低。较高百分比（即30%和40%）的水泥替代会对混凝土力学性能产生负面影响。另一方面，与抗压强度相比，添加纤维能积极提高含或不含粉煤灰的混凝土混合料的抗弯和抗拉强度。最后得出结论，这两种材料的联合添加可提高普通水泥混凝土的强度和韧性，有利于生态友好型循环经济的应用。在粉煤灰的每个百分比下，成功建立了纤维增强混凝土力学性能之间的关系。对于每个百分比的粉煤灰纤维增强混凝土，一般关系的决定系数R²在（0.48 - 0.90）至（0.68 - 0.96）之间变化。此外，纤维的积累有效提高了所有混凝土混合料的力学性能。
