Carbonation of concretes containing calcareous fly ashes

Daria Jóźwiak-Niedźwiedzka; Maciej Sobczak; Karolina Gibas

doi:10.7409/rabdim.013.016

Published: 2014-02-01

Vol. 12 No. 2 (2013)

Carbonation of concretes containing calcareous fly ashes

Daria Jóźwiak-Niedźwiedzka , Maciej Sobczak , Karolina Gibas

Section: Articles

https://doi.org/10.7409/rabdim.013.016

Abstract

The purpose of this research was to determine the carbonation depths in concrete containing calcareous fly ash. Eleven concrete mixes with the same water-binder ratio w/b and with different amounts of calcareous fly ash have been prepared in laboratory. In the test series I the mixes were produced with five blended cements containing different amounts of the following supplementary cementitious materials: calcareous fly ash, siliceous fly ash and granulated blast furnace slag. The second test series was produced with calcareous fly ash replacing 30% of the cement by weight. The maximum depth of carbonation in concrete was determined using the phenolphthalein method. The progress of the carbonation front was established by analysing polished thin sections of concrete under a polarizing microscope in transmitted light. The most resistant to carbonation was the concrete containing, beside clinker, 14.3% of calcareous fly ash as a cementitious material. The specimens of concrete containing different amounts of calcareous fly ash were compared and no significant variations were found both in the rate and depth of carbonation. On the other hand, the rate of advancement of carbonation front was higher in concrete containing calcareous fly ash as compared to the reference concrete without admixtures.

Keywords:

blended cements, calcareous fly ash, carbonation, particle size separation of fly ash

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Jóźwiak-Niedźwiedzka, D., Sobczak, M., & Gibas, K. (2014). Carbonation of concretes containing calcareous fly ashes. Roads and Bridges - Drogi I Mosty, 12(2), 223–236. https://doi.org/10.7409/rabdim.013.016

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Daria Jóźwiak-Niedźwiedzka

djozwiak@ippt.pan.pl

Affiliation:

Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw

Maciej Sobczak

Affiliation:

Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw

Karolina Gibas

Affiliation:

Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw

Carbonation of concretes containing calcareous fly ashes

Abstract

Keywords:

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