Open Access

ARTICLE

Multi-Scale Investigation on Concrete Prepared with Recycled Aggregates from Different Parent Concrete

Zhenhua Duan, Nv Han, Amardeep Singh, Jianzhuang Xiao^*

Department of Structural Engineering, Tongji University, Shanghai, 200092, China

* Corresponding Author: Jianzhuang Xiao. Email:

Journal of Renewable Materials 2020, 8(11), 1375-1390. https://doi.org/10.32604/jrm.2020.013044

Received 23 July 2020; Accepted 07 August 2020; Issue published 28 September 2020

Abstract

Recycled aggregates (RA) are frequently obtained from various unknown sources, which caused variation in properties among recycled aggre- gates concrete (RAC). This paper investigated the macro and microscopic proper- ties of RAC prepared with RAs originated from different parent concretes with 90-day strength ranging from 30 MPa to 100 MPa. These parent concretes were prepared in advance and crushed to produce RA of distinct qualities. The attached mortar content can reach up to 69% in the concrete with highest strength grade. The microscopic investigation on different RAC was conducted with the X-ray Micro-Computed Tomography scanning technique and image process. Experi- mental results showed that the properties of RA derived from various parent concrete varied because of the amount of residual mortar. The development of mechanical properties and chloride-ion penetration of RACs all followed a bino- mial trend with the strength grades of the parent concrete because of the different quantity and quality of RAs.

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Citations