Features of accelerated carbonization of concrete based on alkaline-alkaline earth binders

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Abstract

Studies of the resistance of concretes based on alkali-alkaline earth binders to carbonation are of significant scientific and practical interest in connection with the development of technologies for reducing the carbon footprint in building materials science. These technologies make it possible to ensure the disposal of industrial waste in construction and reduce the use of Portland cement. The article presents the results of a study of the features of the accelerated carbonation of concrete based on dust removal from the mineral wool production cupola at a carbon dioxide concentration of 10% vol. d. Samples with a water-cement ratio of 0.45, 0.55, 0.60 were tested. An aqueous solution of caustic soda with a concentration of 6 mol/l was used as an alkaline activator. It is established that the carbonation rate of the samples has a damping character and is expressed as a power function of the carbonization depth over time. The results of changes in compressive strength before and after carbonation are presented, showing an increase in residual compressive strength due to the use of a low-base binder. The main product of accelerated carbonation is nahcolite.

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About the authors

P. A. Fedorov

Ufa State Petroleum Technological University

Author for correspondence.
Email: fpa_idpo@mail.ru

Candidate of Sciences (Engineering) 

Russian Federation, 1, Kosmonavtov Sreet, Ufa, 450064

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Supplementary files

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2. Fig. 1. Installation for accelerated carbonation of concrete: a – general view of the installation; b – measurement of CO2 concentration using a gas analyzer

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3. Fig. 2. Sample chips: a – before testing; b – 14 days after exposure in an accelerated carbonization chamber

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4. Fig. 3. Graphs of changes in CO2 absorption by samples during the first day: 1 – composition I; 2 – composition II; 3 – composition III

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5. Fig. 4. Dependence of the depth of concrete carbonation on the exposure time: 1 – composition I; 2 – composition II; 3 – composition III

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6. Fig. 5. Carbonation depth of concrete at the age of 600 h: 1 – according to the results of the tests; 2 – according to S.N. Alekseev, N.K. Rosenthal [20]; 3 – according to V.I. Novgorodsky, M.M. Guseva et al. [21]

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7. Fig. 6. Dependence of the content of the initial equivalent of Na2O oxide of each sample on the depth of carbonization: 1 – according to V.I. Novgorodsky, M.M. Guseva et al. [21]; 2 – according to the results of the studies conducted

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8. Fig. 7. Dynamics of changes in compressive strength from the beginning of alkaline activation to the end of accelerated carbonization exposure for 14 days: 1 – 1 day after mixing; 2 – after heat and moisture treatment; 3 – after one day of exposure; 4 – after 14 days of exposure

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9. Fig. 8. Diffractograms from the carbonized and non-carbonized zones of the sample of composition I after 14 days of accelerated carbonization

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