Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures

Shi Cong Kou, Chi Sun Poon, Miren Etxeberria

Research output: Journal article publicationJournal articleAcademic researchpeer-review

66 Citations (Scopus)

Abstract

In this paper, the effects of high temperature exposure of recycled aggregate concretes in terms of residual strengths, capillary water absorption capacity and pore size distribution are discussed. Two mineral admixtures, fly ash (FA) and ground granulated blast furnace (GGBS) were used in the experiment to partially replace ordinary Portland cement for concrete production. The water to cementitious materials ratio was maintained at 0.50 for all the concrete mixes. The replacement levels of natural aggregates by recycled aggregates were at 0%, 50% and 100%. The concretes were exposed separately to 300 °C, 500 °C and 800 °C, and the compressive and splitting tensile strength, capillary water coefficient, porosity and pore size distribution were determined before and after the exposure to the high temperatures. The results show that the concretes made with recycled aggregates suffered less deteriorations in mechanical and durability properties than the concrete made with natural aggregates after the high temperature exposures.
Original languageEnglish
Pages (from-to)73-82
Number of pages10
JournalCement and Concrete Composites
Volume53
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Compressive strength
  • Fly ash
  • GGBS
  • High temperature
  • Porosity
  • Recycled aggregate

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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