Quantifying the cementing efficiency of fine glass powder and its comparison to fly ash

Nathan Schwarz, Narayanan Neithalath

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

2 Scopus citations

Abstract

This paper forms part of a comprehensive study that is being carried out to quantify the influence of a fine glass powder as a supplementary cementing material (SCM) in concrete. The compressive strengths, non-evaporable water content, and time-dependent electrical conductivity of cement pastes modified with fine glass powder and Class F fly ash are compared. The pastes modified with 5% and 10% glass powder show comparable or higher strengths than those of similarly modified fly ash pastes, showing that glass powder can perform in an analogous manner to fly ash at these replacement levels. While 20% glass powder content results in negligible strength enhancement in pastes after 28 days, 20% fly ash modified pastes show a higher rate of strength enhancement in pastes after 28 days, indicating pozzolanic reaction. A factor called strength efficiency is proposed in this paper that can be used as an indicator of efficiency of SCM replacing cement at various ages. Determination of non-evaporable water contents of the plain and modified pastes showed that the glass powder uses less water than fly ash and cement during hydration. Increased cement hydration in the presence of glass powder until about 28 days (partly because of the lower water absorption of glass powder) is evident from the non-evaporable water content values. The glass powder modified pastes show lower effective electrical conductivities than the plain pastes and fly ash modified pastes at 14 days for similar replacement levels.

Original languageEnglish (US)
Title of host publicationProceedings of the 1st International Conference on Recent Advances in Concrete Technology, RAC 2007
EditorsAmde M. Amde, Gajanan M. Sabnis, John S. Y. Tan
PublisherDEStech Publications Inc.
Pages735-746
Number of pages12
ISBN (Electronic)9781932078763
StatePublished - Jan 1 2007
Event1st International Conference on Recent Advances in Concrete Technology, RAC 2007 - Washington, United States
Duration: Sep 19 2007Sep 21 2007

Publication series

NameProceedings of the 1st International Conference on Recent Advances in Concrete Technology, RAC 2007

Other

Other1st International Conference on Recent Advances in Concrete Technology, RAC 2007
CountryUnited States
CityWashington
Period9/19/079/21/07

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Keywords

  • Cement paste
  • Conductivity
  • Fly ash
  • Glass powder
  • Non-evaporable water
  • Strength efficiency

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)
  • Building and Construction

Cite this

Schwarz, N., & Neithalath, N. (2007). Quantifying the cementing efficiency of fine glass powder and its comparison to fly ash. In A. M. Amde, G. M. Sabnis, & J. S. Y. Tan (Eds.), Proceedings of the 1st International Conference on Recent Advances in Concrete Technology, RAC 2007 (pp. 735-746). (Proceedings of the 1st International Conference on Recent Advances in Concrete Technology, RAC 2007). DEStech Publications Inc..