Fundamental Study on Recycling Waste Foundry Sand as Fine Aggregate for Concrete

폐주물사를 콘크리트용 잔골재로 재활용하기 위한 기초연구

  • 문한영 (한양대학교 공과대학 토목공학과) ;
  • 최연왕 (세명대학교 건설공학부 토목공학과) ;
  • 송용규 (한양대학교 대학원 토목공학과) ;
  • 신동구 (한양대학교 대학원 토목공학과)
  • Published : 2001.05.01

Abstract

The development of automobile, vessel, rail road, and machine industry leads increase of foundry production used as their components, which cause a by-product, waste foundry sand (WFS). The amount of the WFS produced in Korea is over 900,000 ton a year, but most WFS buries itself and only 5~6% WFS is recycled as a material in construction materials. In this study, WFS is used as a fine aggregate for concrete. Five types of concretes aimed at the specified strength of 240$\pm$10 kgf/$cm^{2}$ , air contents of 4.5$\pm$1% and slump of 12$\pm$1.5cm were mixed with washed coarse seashore sand(WFS) in which salt was removed and then optimum mix proportion of concrete was determined. Moreover, basic properties such as setting time, workability, bleeding and slump loss of the fresh concrete with WFS were tested and compared with those of the concrete mixed without WFS. In .addition, both compressive strength of hardened concrete at each ages and tensile strength of it at the age of 28 days were measured and discussed.

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