Hardened properties of recycled aggregate concrete prepared with fly ash

S. C. Kou, Chi Sun Poon, L. Lam, D. Chan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

10 Citations (Scopus)

Abstract

The effects of the incorporation of Class F fly ash on the hardened properties of recycled aggregate concrete were determined. The concrete mixtures were prepared with a water-to-binder (W/B) ratio of 0.55. The recycled aggregate was used as 0, 20, 50 and 100 % by weight replacements of natural aggregate. In addition, fly ash was used as 0, 25 and 35 % by weight replacements of cement. The results showed that the compressive strengths, the tensile strengths and the static modulus of elasticity values of the concrete at all ages decreased as the recycled aggregate and the fly ash contents increased. Furthermore, an increase in the recycled aggregate content decreased the resistance against chloride-ion penetration and increased the drying shrinkage of concrete. The use of fly ash as a substitution of cement improved the resistance against chloride-ion penetration and decreased the drying shrinkage of the recycled aggregate concrete. The results s how that one of the practical ways to utilize a higher percentage of recycled aggregates in structural concrete is by incorporating 25-35 percents of flyash.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Sustainable Waste Management and Recycling
Subtitle of host publicationConstruction Demolition Waste
Pages189-197
Number of pages9
Publication statusPublished - 1 Dec 2004
EventInternational Conference on Sustainable Waste Management and Recycling - London, United Kingdom
Duration: 14 Sep 200415 Sep 2004

Conference

ConferenceInternational Conference on Sustainable Waste Management and Recycling
CountryUnited Kingdom
CityLondon
Period14/09/0415/09/04

Keywords

  • Fly ash
  • Hardened properties
  • Recycled aggregate concrete

ASJC Scopus subject areas

  • Engineering(all)

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