Freezing and thawing resistance of air-entrained concrete incorporating recycled coarse aggregate: The role of air content in demolished concrete

A. Gokce, S. Nagataki, T. Saeki, M. Hisada

Research output: Contribution to journalArticle

133 Citations (Scopus)

Abstract

This study aims to introduce new information on freezing and thawing resistance when air-entrained or non-air-entrained concrete is used as recycled coarse aggregate into air-entrained concrete. The laboratory produced air-entrained and non-air-entrained concretes with a water/cement (w/c) ratio of 0.45 were recycled at the crushing age of 1 year to obtain the coarse aggregates used in the investigations. The recycling process was performed in three stages to produce recycled coarse aggregates with different adhered mortar contents. The results showed that recycled coarse aggregate produced from non-air-entrained concrete caused poor freezing and thawing resistance in concrete even when the new system had a proper air entrainment. Microstructural studies indicated that non-air-entrained adhered mortar caused disintegration of the recycled coarse aggregate in itself and disrupted the surrounding new mortar after a limited number of freezing and thawing cycles. Minimizing non-air-entrained adhered mortar or enhancing the performance of new surrounding matrix could not give satisfactory results for a long freezing and thawing exposure.

Original languageEnglish
Pages (from-to)799-806
Number of pages8
JournalCement and Concrete Research
Volume34
Issue number5
DOIs
Publication statusPublished - 2004 May 1
Externally publishedYes

Keywords

  • Air content
  • Demolished concrete
  • Freezing and thawing
  • Microcracking
  • Recycled coarse aggregate

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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