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Using cellulose nanocrystals to improve the mechanical properties of fly ash-based geopolymer construction materials
Engineering Science and Technology, an International Journal ( IF 5.1 ) Pub Date : 2021-05-07 , DOI: 10.1016/j.jestch.2021.04.008
Rishen Roopchund 1, 2 , Jerome Andrew 3 , Bruce Sithole 1, 3
Affiliation  

Ordinary Portland cement production is one of the biggest emitters of carbon dioxide. Consequently, there is a strong need for construction materials with lower environmental footprints. However, the development of alternative green construction materials requires a standardized framework. Although cellulose nanocrystals have shown considerable reinforcement potential in conventional construction materials, its effect on the mechanical properties of fly ash-based geopolymers as green construction materials is not known. Consequently, a detailed database outlining the cellulose nanocrystals interactions on the compressive strength, density, and corrosion resistance properties of geopolymers can optimize and guide further research efforts. The aims of this study were to firstly determine the effect of cellulose nanocrystals on the mechanical properties of fly ash-based geopolymers. Secondly, to produce a database of the effects of cellulose nanocrystals concentration and activator concentration on the mechanical properties of the formed geopolymers. Finally, to formulate an empirical framework to develop green construction materials. An empirical framework was developed alongside the cellulose nanocrystals-reinforced geopolymers, which were optimized using a statistical experimental design. The experimental results yielded the geopolymer property database. It was found that low cellulose nanocrystals concentrations (less than 0.5%) favoured the geopolymer mechanical properties. Using industrial wastes to produce green construction materials can divert industrial wastes from landfills and minimize the widespread use of environmentally degrading conventional construction materials. The framework developed in this study can facilitate the commercialization of green construction materials in industry.



中文翻译:

使用纤维素纳米晶体改善粉煤灰基地质聚合物建筑材料的力学性能

普通波特兰水泥生产是最大的二氧化碳排放源之一。因此,强烈需要具有较低环境足迹的建筑材料。然而,替代绿色建筑材料的开发需要一个标准化的框架。尽管纤维素纳米晶体在常规建筑材料中显示出相当大的增强潜力,但其对作为绿色建筑材料的粉煤灰基地质聚合物的机械性能的影响尚不清楚。因此,概述纤维素纳米晶体相互作用对地质聚合物的抗压强度、密度和耐腐蚀性能的详细数据库可以优化和指导进一步的研究工作。本研究的目的是首先确定纤维素纳米晶体对粉煤灰基地质聚合物力学性能的影响。其次,建立纤维素纳米晶体浓度和活化剂浓度对形成的地质聚合物力学性能影响的数据库。最后,制定发展绿色建筑材料的实证框架。与纤维素纳米晶体增强的地质聚合物一起开发了一个经验框架,并使用统计实验设计进行了优化。实验结果产生了地质聚合物特性数据库。发现低纤维素纳米晶体浓度(小于 0.5%)有利于地质聚合物的机械性能。利用工业废物生产绿色建筑材料可以将工业废物从垃圾填埋场转移,并最大限度地减少对环境退化的传统建筑材料的广泛使用。本研究中开发的框架可以促进绿色建筑材料在工业中的商业化。

更新日期:2021-05-07
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