Effect of elevated temperatures and cooling methods on strength of concrete made with coarse and fine recycled concrete aggregates. (20th June 2019)

• Record Type: Journal Article
• Authors: Wang, Yuyin; Liu, Faqi; Xu, Liangfu; Zhao, Hui
• Is Part Of: Construction & building materials. Volume 210(2019)
• Page Start: 540
• Page End: 547
• Publication Date: 2019-06-20
• Subjects: Fine recycled concrete aggregate -- Concrete -- Elevated temperature -- Cooling method -- Strength; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.03.215
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Residual strengths of concrete containing both coarse and fine RCAs after 20–800 °C exposure and under two cooling methods. Influence of temperature on residual strengths of RAC under two cooling methods. Fine RCA content (0, 50% and 100%) effect on residual strengths of RAC subjected to two cooling methods. Effects of natural and water cooling on residual strengths of RAC after exposure. Abstract: In this study, the compressive and splitting tensile strengths of concrete containing both coarse and fine recycled concrete aggregates (RCA) were measured after subjected to elevated temperatures from 20 to 800 °C and two cooling regimes (natural and water cooling). Three concretes were produced with 100% coarse RCA and different replacements of fine RCA (0, 50% and 100%). Experimental results indicate that the compressive and splitting tensile strength of all concretes decline with increasing temperature irrespective of cooling methods. Concrete having 100% fine RCA content presents higher normalized residual compressive strength than concrete containing 0% and 50% fine RCA under two cooling regimes. Influence of fine RCA replacement level on normalized residual splitting tensile strength after exposure is found to be fluctuant. Data from experimental results also show that strength deterioration is more severe for concrete samples under water cooling compared to that under natural cooling, especially at temperatures of 200 and 400 °C.