Durability and compressive strength of composite polyolefin fiber-reinforced recycled aggregate concrete: An experimental study

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES
Mojtaba Gorji Azandariani , Mehdi Vajdian , Mehrdad Javadi , Ali Parvari
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Abstract

This study investigates of using recycled concrete aggregates along with the reinforcement of polyolefin fibers to augment both the compressive strength and durability of concrete, in alignment with the principles of sustainable development. This study experimentally investigated the compressive strengths and durability of composite polyolefin fiber-reinforced recycled aggregate concrete (PFRRAC) exposed to chloride and acidic environments. For this purpose, 150 cubic concrete samples of 100 × 100 × 100 mm with various combinations of recycled aggregates and polyolefin fibers were made and subjected to axial compressive loading. The results show that the addition of fibers significantly enhances the compressive strength of concrete, with an increase of up to 34.36 % at 5 % fiber content. However, increasing the proportion of recycled aggregates reduces the compressive strength, with reductions ranging from 21.12 % to 43.85 % as the recycled aggregate content rises to 70 %. Moreover, the combination of fibers and recycled aggregates demonstrates potential for improving the sustainability and durability of concrete under challenging environmental conditions, particularly in chloride and acidic environments. In acidic environments, the inclusion of fibers significantly enhances the resistance to strength reduction. Furthermore, the study uncovers that a higher concentration of recycled aggregates exacerbates the reduction in strength in chloride-rich settings, emphasizing the imperative nature of meticulous mix design and material selection. The findings for the integration of even minor quantities of polyolefin fibers to amplify the performance and sustainability of concrete mixtures, especially when utilizing recycled aggregates, thus promoting eco-friendly construction practices.
复合聚烯烃纤维增强再生骨料混凝土的耐久性和抗压强度:实验研究
本研究探讨了使用再生混凝土骨料和聚烯烃纤维增强材料来提高混凝土的抗压强度和耐久性,以符合可持续发展的原则。本研究通过实验研究了暴露在氯化物和酸性环境中的复合聚烯烃纤维增强再生骨料混凝土(PFRRAC)的抗压强度和耐久性。为此,我们制作了 150 个 100 × 100 × 100 毫米的立方体混凝土样品,其中包含不同组合的再生骨料和聚烯烃纤维,并对其进行轴向抗压加载。结果表明,添加纤维可显著提高混凝土的抗压强度,纤维含量为 5% 时,抗压强度最高可提高 34.36%。然而,增加再生骨料的比例会降低抗压强度,当再生骨料含量增加到 70% 时,抗压强度会降低 21.12% 到 43.85%。此外,纤维和再生骨料的组合还显示出在具有挑战性的环境条件下,特别是在氯化物和酸性环境中,改善混凝土可持续性和耐久性的潜力。在酸性环境中,纤维的加入大大增强了抗强度降低的能力。此外,研究还发现,在富含氯化物的环境中,较高浓度的再生骨料会加剧强度的降低,从而强调了精心设计混合料和选择材料的必要性。研究结果表明,即使是少量的聚烯烃纤维,也能提高混凝土混合物的性能和可持续性,尤其是在使用再生骨料的情况下,从而促进生态友好型建筑实践。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Composites Part C Open Access
Composites Part C Open Access Engineering-Mechanical Engineering
CiteScore
8.60
自引率
2.40%
发文量
96
审稿时长
55 days
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