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Production of sustainable concrete utilising high-volume blast furnace slag and recycled aggregate with lime activator
Journal of Cleaner Production ( IF 9.7 ) Pub Date : 2020-01-20 , DOI: 10.1016/j.jclepro.2020.120188
Rajib Kumar Majhi , Amar Nath Nayak

Waste products from construction sector and industries have been significantly increased in the last decade, which create serious environmental problems. Therefore, their utilisation in concrete has great role in the production of sustainable concrete, preservation of natural resources and proper solid waste management. This study involves the fundamental characterisation of sustainable concrete produced using high volumes of recycled coarse aggregate (RCA) and ground granulated blast furnace slag (GGBFS) with addition of lime for its application in structural concrete members. In this investigation, at the first, the effects of lime as an alkaline activator on the mechanical and micro-structural properties of high volume GGBFS based recycled aggregate concrete (RAC) is studied in order to obtain the desired mechanical properties. From the study, the experimental results reveal that lime can be effective in activating the GGBFS and thereby, enhancing the mechanical properties such as (1) compressive strength, (2) splitting tensile strength, (3) flexural strength and (4) bond strength of high volume GGBFS based RAC. The enhancement in the above strength properties of GGBFS based RAC mixes are found to be in the range 14.02%-19.61%, 9.33%-14.07%, 10.74%-14.71% and 6.65%-14.17% for compressive, splitting tensile, flexural and bond strength, respectively. The trend of the above results is also supported by X-ray diffraction and scanning electron microscopy investigations. Secondly, the cost-effective analysis including the sensitivity analysis of cost for this concrete are carried out to ascertain its (5) economic benefit. The cost-effective analysis reveals that the cost of concrete reduces by 7.15%-11.80% for the combined use of RCA, GGBFS and lime. Thirdly, environmental impact analysis of this concrete is also performed to assess its (6) environmental benefit. It is found that the impacts on various environmental factors reduce by 32.5%-67.0% for using RCA, GGBFS and lime in concrete. Hence, it is concluded that the concrete produced using high volume of GGBFS and RCA with addition of lime activator provides the desired strength, environmental benefit by reducing the environmental impacts and minimising the waste disposal problem, economical benefit by reducing the cost and social benefit by preserving natural resources for future generation due to which this concrete becomes sustainable.



中文翻译:

利用大量高炉矿渣和石灰活化剂回收骨料生产可持续混凝土

在过去的十年中,建筑部门和工业产生的废物大量增加,造成了严重的环境问题。因此,它们在混凝土中的利用在可持续混凝土的生产,自然资源的保存和适当的固体废物管理中具有重要作用。这项研究涉及使用大量再生粗骨料(RCA)和高炉矿渣粉(GGBFS)以及石灰在结构混凝土构件中的应用生产的可持续混凝土的基本特性。在这项研究中,首先,研究了石灰作为碱性活化剂对高体积GGBFS基再生骨料混凝土(RAC)的机械和微观结构性能的影响,以获得所需的机械性能。从研究中 实验结果表明,石灰可以有效地活化GGBFS,从而增强机械性能,例如(1)抗压强度,(2)拉伸抗拉强度,(3)弯曲强度和(4)大体积GGBFS的粘结强度基于RAC。发现基于GGBFS的RAC混合物的上述强度特性的提高范围为压缩,劈裂拉伸,挠曲和弯曲的14.02%-19.61%,9.33%-14.07%,10.74%-14.71%和6.65%-14.17%。粘结强度。X射线衍射和扫描电子显微镜研究也支持上述结果的趋势。其次,进行成本效益分析,包括对该混凝土成本的敏感性分析,以确定其(5)经济效益。成本效益分析表明,RCA,GGBFS和石灰的组合使用可使混凝土的成本降低7.15%-11.80%。第三,还对该混凝土进行了环境影响分析,以评估其(6)环境效益。发现在混凝土中使用RCA,GGBFS和石灰对各种环境因素的影响降低了32.5%-67.0%。因此,得出的结论是,使用大量的GGBFS和RCA以及石灰活化剂生产的混凝土可提供所需的强度,通过减少对环境的影响并最大程度地减少废物处理问题而带来的环境效益,通过降低成本和社会效益而产生的经济效益。保护下一代的自然资源,使这种混凝土变得可持续。还对该混凝土进行了环境影响分析,以评估其(6)环境效益。发现在混凝土中使用RCA,GGBFS和石灰对各种环境因素的影响降低了32.5%-67.0%。因此,得出的结论是,使用大量的GGBFS和RCA以及石灰活化剂生产的混凝土可提供所需的强度,通过减少对环境的影响并最大程度地减少废物处理问题而带来的环境效益,通过降低成本和社会效益而产生的经济效益。保护下一代的自然资源,使这种混凝土变得可持续。还对该混凝土进行了环境影响分析,以评估其(6)环境效益。发现在混凝土中使用RCA,GGBFS和石灰对各种环境因素的影响降低了32.5%-67.0%。因此,得出的结论是,使用大量的GGBFS和RCA以及石灰活化剂生产的混凝土可提供所需的强度,通过减少对环境的影响并最大程度地减少废物处理问题而带来的环境效益,通过降低成本和社会效益而产生的经济效益。保护下一代的自然资源,使这种混凝土变得可持续。GGBFS和石灰在混凝土中。因此,可以得出结论,使用大量的GGBFS和RCA以及石灰活化剂生产的混凝土可提供所需的强度,通过减少对环境的影响并最大程度地减少废物处理问题而带来的环境效益,通过降低成本和社会效益而产生的经济效益。保护下一代的自然资源,使这种混凝土变得可持续。GGBFS和石灰在混凝土中。因此,得出的结论是,使用大量的GGBFS和RCA以及石灰活化剂生产的混凝土可提供所需的强度,通过减少对环境的影响并最大程度地减少废物处理问题而带来的环境效益,通过降低成本和社会效益而产生的经济效益。保护下一代的自然资源,使这种混凝土变得可持续。

更新日期:2020-01-21
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