Properties of Geopolymer Concrete Made With Recycled Concrete Aggregates and Glass Fibers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This research aims to evaluate the workability and compressive strength of geopolymer concrete made with recycled concrete aggregates (RCA) and glass fibers (GF). The ambient-cured geopolymer concrete was prepared using a binder blend of slag and fly ash (3:1) and fine aggregates in the form of desert dune sand. Natural aggregates or RCA served as the coarse aggregates, while sodium silicate and sodium hydroxide formulated the alkaline activator solution. The investigated process parameters included the replacement percentage of natural aggregates with RCA, binder content, amount of additional water (added to the alkaline activator solution), particle size distribution of RCA, and volume fraction of GF. Experimental results indicated that replacing natural aggregates with 100% RCA had an insignificant impact on the workability but reduced the compressive strength by up to 25%. Increasing the binder content from 300 to 450 kg/m3 in RCA geopolymer concrete reinforced with up to 2% GF, by volume, led to up to 28, 106, and 17% higher workability and 1- and 7-day compressive strengths, respectively. Adding up to 50 kg/m3 of water increased the workability up to 230 mm while decreasing the compressive strength by up to 22%. Meanwhile, sieving the RCA to remove particles smaller and larger than 4.75 mm and 19 mm, respectively, increased the slump to 210 mm and 1- and 7-day compressive strength by 29 and 35%, correspondingly. The addition of 1 and 2% GF, by volume, decreased the workability by 2 and 9%, respectively, in comparison to the plain RCA geopolymer concrete mix, while the compressive strength was unaffected. Experimental findings highlight the possibility of utilizing RCA as a replacement for natural aggregates in slag-fly ash blended geopolymer concrete reinforced with glass fibers without compromising performance. Such beneficial use of RCA serves as a means of alleviating the adverse environmental impact associated with its disposal.

Original languageEnglish
Title of host publicationProceedings of the 9th International Conference On Civil Structural and Transportation Engineering, ICCSTE 2024
EditorsKhaled Sennah
PublisherAvestia Publishing
ISBN (Print)9781990800382
DOIs
Publication statusPublished - 2024
Event9th International Conference on Civil, Structural and Transportation Engineering, ICCSTE 2024 - Toronto, Canada
Duration: Jun 13 2024Jun 15 2024

Publication series

NameInternational Conference on Civil, Structural and Transportation Engineering
ISSN (Electronic)2369-3002

Conference

Conference9th International Conference on Civil, Structural and Transportation Engineering, ICCSTE 2024
Country/TerritoryCanada
CityToronto
Period6/13/246/15/24

Keywords

  • compressive strength
  • concrete
  • fibers
  • Geopolymer
  • recycled aggregates
  • slump

ASJC Scopus subject areas

  • Transportation
  • Materials Chemistry

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