Hybrid Environmentally Friendly Method for RCA Concrete Quality Improvement

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Alieh Mardani, Ngoc Kien Bui, Takafumi Noguchi
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Abstract

Research on concrete recycling has led to the discovery of many processes for recycled concrete aggregate (RCA) treatment, each with its pros and cons on quality improvement, resource requirements, or scalability. This study aimed to propose a technique that combines two methods (mechanical grinding and acidic soaking) for mortar removal and improves the quality of RCA so as to realize a zero-waste, highly efficient, few-hours-long single-step process which we call acid milling. A quantitative comparison of aggregate and final concrete quality has been performed between each separate method. The proposed method shows about 57% relative improvement of aggregate quality for water absorption and density, while the concrete experiment shows up to 10% relative improvement for the compressive and flexural strengths compared with the untreated RCA concrete. This study paves the way for an efficient and sustainable concrete recycling process to be applied on a large scale.

Abstract Image

改善 RCA 混凝土质量的混合环保型方法
通过对混凝土回收利用的研究,人们发现了许多回收混凝土骨料(RCA)的处理工艺,每种工艺在提高质量、资源需求或可扩展性方面都各有利弊。本研究旨在提出一种结合两种方法(机械研磨和酸性浸泡)的技术,既能去除砂浆,又能提高 RCA 的质量,从而实现零浪费、高效率、只需几小时的单步工艺,我们称之为酸性研磨。我们对每种不同方法的骨料和最终混凝土质量进行了定量比较。与未经处理的 RCA 混凝土相比,拟议方法在吸水率和密度方面使骨料质量相对提高了约 57%,而混凝土实验则使抗压强度和抗折强度相对提高了 10%。这项研究为大规模应用高效、可持续的混凝土回收工艺铺平了道路。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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