Waste glass for use in geopolymers

Mary U. Christiansen, Lawrence L. Sutter

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

Abstract

Waste glass is considered for use in a geopolymer binder systems based on the high Si content, amorphous framework structure, adequate hardness and widespread availability. A lack of Al within the system, however, must be taken into account, as Si/Al and Na/Al ratios have been shown to affect properties such as setting time, compressive strength and micro structure. Metakaolin and fly ash were added to a glass-based system, lowering the Si/Al and bringing Na/Al closer to unity. Mortars made using 100% glass as well as 25 and 50% of fly ash or metakaolin by mass were activated with 10M NaOH and cured at 80°C for 24 hours. Microstructural characterization of fracture surfaces and thin sections as well as compressive strength and degree of reaction data was collected. The 100% glass mixture (Si/Al - 8.39, Na/Al - 1.61) and 25% metakaolin (Si/Al - 4.96, Na/Al - 0.97) mixtures showed a dense, continuous microstructure. The 25% MK mix resulted in a 1-day f'c of above 5000 psi (35 MPa), while the 50% metakaolin mixture (Si/Al = 3.45, Na/Al - 0.69) developed little strength and had a low-density microstructure, possibly due to the high water demand. Mixtures containing fly ash resulted in reasonable compressive strengths and moderately dense microstructures.

Original languageEnglish (US)
Title of host publicationAdvances in Green Binder Systems 2012 - Held at the ACI Spring 2012 Convention
PublisherAmerican Concrete Institute
Pages21-37
Number of pages17
Edition294 SP
ISBN (Print)9781632663245
StatePublished - Jan 1 2012
EventAdvances in Green Binder Systems 2012 at the ACI Spring 2012 Convention - Dallas, TX, United States
Duration: Mar 18 2012Mar 22 2012

Publication series

NameAmerican Concrete Institute, ACI Special Publication
Number294 SP
ISSN (Print)0193-2527

Other

OtherAdvances in Green Binder Systems 2012 at the ACI Spring 2012 Convention
CountryUnited States
CityDallas, TX
Period3/18/123/22/12

Keywords

  • Alkali activation
  • Fly ash
  • Geopolymer
  • Metakaolin
  • Sodium hydroxide
  • Waste glass

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