Compressive strength, pore size distribution and chloride-ion penetration of recycled aggregate concrete incorporating class-F fly ash

Shicong Kou, Chi Sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)

Abstract

The effects of fly ash on the compressive strength, pore size distribution and chloride-ion penetration of recycled aggregate concrete were investigated. Two series of concrete mixtures were prepared. The concrete mixtures in series I had a water-to-binder ratio and a cement content of 0.55 and 410 kg/m3, respectively. The concrete mixtures in series II had a water-to-binder ratio and a cement content of 0.45 and 400 kg/m3respectively. Recycled aggregate was used as 20%, 50%, and 100% replacements of natural coarse aggregate in the concrete mixtures in both series. In addition, fly ash was used as 0%, 25% and 35% by weight replacements of cement. The results show that the compressive strengths of the concrete decreased as the recycled aggregate and the fly ash contents increased. The total porosity and average porosity diameter of the concrete increased as the recycled aggregate content increased. Furthermore, an increase in the recycled aggregate content decreased the resistance to chloride ion penetration. Nevertheless, the replacement of cement by 25% fly ash improved the resistance to chloride ion penetration and pore diameters and reduced the total porosity of the recycled aggregate concrete.
Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalJournal Wuhan University of Technology, Materials Science Edition
Volume21
Issue number4
DOIs
Publication statusPublished - 1 Dec 2006

Keywords

  • Durability properties
  • Fly ash
  • Recycled aggregate concrete

ASJC Scopus subject areas

  • Materials Science(all)

Cite this