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Engineering properties of geopolymer concrete incorporating hybrid nano-materials
Ain Shams Engineering Journal ( IF 6 ) Pub Date : 2021-05-07 , DOI: 10.1016/j.asej.2021.04.022
Menatalah A. Kotop , M.S. El-Feky , Yousef R. Alharbi , Aref A. Abadel , Abobaker S. Binyahya

Geopolymer concrete is considered to be a sustainable alternative to Portland cement in construction industry. The incorporation of nano materials into geopolymer matrix contributes to enhance the mechanical and durability properties of concrete. Carbon nanotubes (CNTs) are characterized by high tensile strength and good durability properties. However, CNTs particles have significant large specific surface area that leads to encounter adhesion and dispersion difficulties in geopolymer matrix. Nano clay (NC) is utilized to increase pozzolanic activity and decrease the adhesion problems in geopolymer concrete. This research aims to investigate the hybrid effect of NC and CNTs on the resulting performances of hybrid fly ash/slag geopolymer concrete. In this study, geopolymer mixes were produced using fly ash/slag as an aluminosilicate source. The utilized alkaline activator was composed of both; sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions. Mechanical properties of the mixes were determined based on compressive and flexural strengths tests. Also the impacts of the inclusion of NC and CNTs on the air content, chloride resistance and water penetration depth on hybrid fly ash/slag geopolymer concrete were demonstrated. It was observed that the superior compressive strength for geopolymer mix was found to be in the mix incorporated by (2.5%) NC blended with (0.01%) CNTs. The engineering properties were significantly improved by using hybrid nanoparticles. The high pozzolanic effect of NC led to improve the compressive strength, as long as the nanotubes were used to reinforce the geopolymer concrete and hence enhance the durability properties.



中文翻译:

掺入混合纳米材料的地质聚合物混凝土的工程性能

地聚合物混凝土被认为是建筑行业中波特兰水泥的可持续替代品。将纳米材料掺入地质聚合物基体有助于提高混凝土的机械和耐久性性能。碳纳米管 (CNT) 具有高拉伸强度和良好的耐久性能。然而,碳纳米管颗粒具有很大的比表面积,这导致在地质聚合物基质中遇到粘附和分散困难。纳米粘土 (NC) 用于增加火山灰活性并减少地质聚合物混凝土中的粘附问题。本研究旨在研究 NC 和 CNT 对混合粉煤灰/矿渣地质聚合物混凝土的最终性能的混合影响。在这项研究中,使用粉煤灰/矿渣作为铝硅酸盐来源生产地质聚合物混合物。所用的碱性活化剂由两者组成;硅酸钠(Na2 SiO 3 ) 和氢氧化钠 (NaOH) 溶液。基于压缩和弯曲强度测试确定混合物的机械性能。还证明了包含 NC 和 CNT 对混合粉煤灰/矿渣地质聚合物混凝土的空气含量、耐氯化物性和水渗透深度的影响。据观察,地质聚合物混合物的优异抗压强度被发现存在于由 (2.5%) NC 与 (0.01%) CNT 混合的混合物中。通过使用混合纳米粒子,工程性能得到显着改善。NC 的高火山灰效应可提高抗压强度,只要使用纳米管来增强地质聚合物混凝土,从而提高耐久性。

更新日期:2021-05-07
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