Evaluating the use of accelerated test methods for chloride transport in alkali activated slag concretes using electrical impedance and associated models

Narayanan Neithalath, Deepak Ravikumar

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

2 Citations (Scopus)

Abstract

The applicability of accelerated chloride transport test methods, viz., the rapid chloride permeability (RCP) and non-steady state migration (NSSM) tests, commonly used for conventional concretes, for alkali activated slag concrete systems is evaluated in this paper. Both powder and liquid sodium silicate activators are used to activate slag. The effects of changing the total Na20 content and the activator modulus of both the powder and liquid activators on the RCP and NSSM values are reported. RCP values of activated slag concretes show that these concretes perform better than conventional concretes. However, NSSM tests provide values that are comparable to conventional concretes either with or without high performance cement replacement materials such as silica fume. Pore structural studies show that the water glass activated concretes have lower porosities than the powder sodium silicate activated mixtures, but their critical pore sizes are larger, resulting in reduced transport resistance. Electrical circuit models are implemented on the impedance spectroscopic response of alkali activated and conventional concretes. The modeled circuit model parameters are similar for the alkali activated and conventional concretes. Moreover, the changes to these parameters induced by the NSSM test are similar in trends and magnitudes for both alkali activated and conventional concretes, demonstrating the adequacy of the test method for alkali activated binders.

Original languageEnglish (US)
Title of host publicationASTM Special Technical Publication
PublisherASTM International
Pages85-107
Number of pages23
Volume1566 STP
ISBN (Print)9780803175549
DOIs
StatePublished - 2013
EventASTM International Symposium on Geopolymer Binder Systems - San Diego, CA, United States
Duration: Jun 26 2012Jun 27 2012

Other

OtherASTM International Symposium on Geopolymer Binder Systems
CountryUnited States
CitySan Diego, CA
Period6/26/126/27/12

Fingerprint

Acoustic impedance
Alkalies
Slags
Chlorides
Concretes
Powders
Silicates
Sodium
Silica fume
Networks (circuits)
Liquids
Pore size
Binders
Cements
Porosity
Glass
Water

Keywords

  • Alkali activation
  • Chloride trans-port
  • Electrical impedance
  • Microstructure
  • Slag

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Evaluating the use of accelerated test methods for chloride transport in alkali activated slag concretes using electrical impedance and associated models. / Neithalath, Narayanan; Ravikumar, Deepak.

ASTM Special Technical Publication. Vol. 1566 STP ASTM International, 2013. p. 85-107.

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

Neithalath, N & Ravikumar, D 2013, Evaluating the use of accelerated test methods for chloride transport in alkali activated slag concretes using electrical impedance and associated models. in ASTM Special Technical Publication. vol. 1566 STP, ASTM International, pp. 85-107, ASTM International Symposium on Geopolymer Binder Systems, San Diego, CA, United States, 6/26/12. https://doi.org/10.1520/STP156620120104
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AB - The applicability of accelerated chloride transport test methods, viz., the rapid chloride permeability (RCP) and non-steady state migration (NSSM) tests, commonly used for conventional concretes, for alkali activated slag concrete systems is evaluated in this paper. Both powder and liquid sodium silicate activators are used to activate slag. The effects of changing the total Na20 content and the activator modulus of both the powder and liquid activators on the RCP and NSSM values are reported. RCP values of activated slag concretes show that these concretes perform better than conventional concretes. However, NSSM tests provide values that are comparable to conventional concretes either with or without high performance cement replacement materials such as silica fume. Pore structural studies show that the water glass activated concretes have lower porosities than the powder sodium silicate activated mixtures, but their critical pore sizes are larger, resulting in reduced transport resistance. Electrical circuit models are implemented on the impedance spectroscopic response of alkali activated and conventional concretes. The modeled circuit model parameters are similar for the alkali activated and conventional concretes. Moreover, the changes to these parameters induced by the NSSM test are similar in trends and magnitudes for both alkali activated and conventional concretes, demonstrating the adequacy of the test method for alkali activated binders.

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