Influence of industrial by-products and waste paper sludge ash on properties of recycled aggregate concrete

Ngoc Kien Bui, Tomoaki Satomi, Hiroshi Takahashi

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

This paper examines the mechanical properties and durability of recycled aggregate concrete (RAC) containing 100% coarse recycled concrete aggregate (RCA) and industrial by-products. The by-products, including waste paper sludge ash (PSA), fly ash (FA), silica fume (SF), and metakaolin (MK) of different proportions (5%, 10%, 15%) in RAC, were used in two methods: replacement and addition methods. The use of by-products (mineral admixtures) to mitigate the low quality of RAC was demonstrated through experimental outcomes in this study. The addition of industrial by-products was presented as a promising alternative for the addition of more Portland cement in RAC to enhance RAC's quality. The results showed that the strength and durability of RAC containing mineral admixtures in the addition method were higher than the addition of more cement or the replacement method. Notably, PSA considerably improved the mechanical properties of RAC at an early age, and it substantially improved the resistance of RAC to acid and sulfate attacks. At 90 days, FA and MK improved mechanical properties of RAC greater than SF and PSA did. Among combinations, the proportions of by-products in RAC of 5% PSA, 10% SF, 15% MK and 15% FA can produce the highest performance of RAC with 100% coarse recycled concrete aggregate (RCA).

Original languageEnglish
Pages (from-to)403-418
Number of pages16
JournalJournal of Cleaner Production
Volume214
DOIs
Publication statusPublished - 2019 Mar 20

Keywords

  • Metakaolin
  • Mineral admixtures
  • Recycled aggregate concrete
  • Silica fume
  • Waste paper sludge ash
  • fly ash

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Strategy and Management
  • Industrial and Manufacturing Engineering

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