Effect of different additives on the compressive strength of very high-volume fly ash cement composites

R. Roychand, J. Li, M. Saberian, S. Kilmartin-Lynch, M. M.Ul Islam, M. Maghfouri, F. Chen

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

Abstract

The cement industry is responsible for about 5–7% of global greenhouse gas emissions and with the rapid rise in global warming, it is imperative to produce an ecofriendly alternative to Portland cement. Fly ash (FA) is an abundantly available and least utilized industrial byproduct with good pozzolanic properties that can help reduce the carbon footprint of cement composites. We investigated replacing 80% of the cement content with different blends of FA, nanosilica (NS) and silica fume (SF). Hydrated lime and a set accelerator were used to increase the pozzolanic reactivity of the blended cement composites. The portlandite released with 20% cement content was insufficient for the pozzolanic reaction of the blended cement composites containing FA and SF, requiring externally added hydrated lime. The addition of a set accelerator significantly increased the pozzolanic reaction and the resultant compressive strength, and these increased with the increasing content of the set accelerator. The replacement of SF with NS led to a remarkable increase in the pozzolanic reaction. The corresponding compressive strength of FA mixed with cement composites increased with increasing percentage composition of NS.

Original languageEnglish
Title of host publicationNanotechnology in Construction for Circular Economy - Proceedings of NICOM7
EditorsWenhui Duan, Lihai Zhang, Surendra P. Shah
PublisherSpringer
Pages313-320
Number of pages8
ISBN (Print)9789819933297
DOIs
Publication statusPublished - 2023
Externally publishedYes
EventNanotechnology in Construction for Circular Economy 2022 - Melbourne, Australia
Duration: 31 Oct 20222 Nov 2022
https://link.springer.com/book/10.1007/978-981-99-3330-3 (Proceedings)

Publication series

NameLecture Notes in Civil Engineering
Volume356 LNCE
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

ConferenceNanotechnology in Construction for Circular Economy 2022
Abbreviated titleNICOM 2022
Country/TerritoryAustralia
CityMelbourne
Period31/10/222/11/22
Internet address

Keywords

  • Cement
  • Compressive strength
  • Fly ash
  • Nanosilica
  • Set accelerator

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