A Study on the Mechanical Properties of Concrete Using Recycled Coarse Aggregates at High Temperatures

Title & Authors
A Study on the Mechanical Properties of Concrete Using Recycled Coarse Aggregates at High Temperatures
Shin, Woo-Cheol; Lee, Ho-Kyung; Baek, Seung-Min; Kim, Woo-Suk; Kwon, Woo-Hyun; Kwak, Yoon-Keun;

Abstract
The main purpose of this study is to investigate on residual mechanical performance of recycled coarse aggregate concrete (RCAC), after being subjected to high temperatures. In this experiment, a control concrete mix made with natural coarse aggregates and two concrete mixes with RCA replacement ratio of 15% and 30% were designed. Specimens were exposed for a period of $\small{1^{\circ}C/min}$ to temperatures of $\small{20^{\circ}C}$, $\small{200^{\circ}C}$, $\small{400^{\circ}C}$, $\small{600^{\circ}C}$ and $\small{800^{\circ}C}$. After cooling down to ambient temperature, the following basic mechanical properties were then evaluated and compared with reference values obtained prior to thermal exposure: (i) Residual compressive strength; (ii) Residual splitting tensile strength; (iii) Residual flexural strength; (iv) Elastic modulus; (v) SEM analysis & XRD analysis. In addition, XRD and SEM Images analyses were performed to investigate chemical and physical characteristics of RCAC.
Keywords
Recycled Coarse Aggregate;High Temperature;Mechanical Properties;Residual Strength;Residual Elastic Modulus;SEM Analysis;XRD Analysis;
Language
Korean
Cited by
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