Fly Ash Incorporation into the Concrete Composites in Order to Improve their Environmental Performance

Abstract:

Fly ash, representing the fine particulate matter, can be widely used in concrete production in order to improve the concrete properties and its environmental performance. The paper is aimed at applying a statistical approach to evaluate the results of the chemical sulphate corrosion of cement composites with and without fly ash addition. Two aggressive media simulating a sulphate corrosion: 0.5 wt.% solution of H₂SO₄ and 0.5 wt.% solution of Al₂(SO₄)₃ were used. The deterioration process was evaluated by dissolution of the basic components of cement composites due to the aggressive media ́ exposure. The concentrations of dissolved Ca, Si, Al, Fe, Mn and Cu ions in leachates were measured and used as input data in a correlation analysis.Significant and up to very high correlation coefficients have been calculated for all analysed ions leachability excepting cuprum. The findings revealed the similar leaching mechanisms of analysed ions from the concrete samples with 5 and 10 wt. % of fly ash addition. The addition of coal fly ash was not definitely confirmed to increase the environmental resistance of concrete samples in terms of calcium and silicon leaching.

• Periodical: Solid State Phenomena (Volume 244)
• Pages: 108-113
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.244.108
• Online since: October 2015
• Authors: Vlasta Ondrejka Harbulakova*, Adriana Eštoková, Alena Luptáková, Pavol Purcz
• Keywords: Aggressive Media, Cement Replacement, Coal Fly Ash, Concrete

References

[1] A. Bajza, I. Rousekova I, Concrete Technology, (Eds): JAGA, p.190, Bratislava, (2006).

[2] American concrete Institute, Use of Fly Ash in Concrete, ACI 2322R-96, 1996: 34.

[3] M. D. A. Thomas, Optimizing the Use of Fly Ash in Concrete, Portland Cement Association, Skokie, Illinois (2007).

[4] C. Namagga, R.A. Atadero, Optimization of fly ash in concrete: High lime fly ash as a replacement for cement and filler material, 2009 World of Fly Ah (WOCA) Conference, Lexington, KY, USA. (2009).

DOI: 10.14359/18723

[5] EN 206-1 Concrete. Part I.: Specifications, Properties, Made of production and Conformity. (2004).

[6] EN 450: Coal fly ash for concrete. Definitions, Requirements and Quality Conrol.

[7] EN 12620: Gravel Aggregate.

[8] R. C. Joshi, R. P. Lohtia, Fly Ash in Concrete, Production, Properties and Uses – Advances in Concrete Technology, 2, 666. 8. (1993).

[9] V. Ondrejka Harbulakova, P. Purcz, A. Estokova, A. Luptakova, M. Repka, M., Using a Statistical Method for the Concrete Deterioration Assessment in Sulphate Environment, Chemical Engineering Transaction, 43. (2015).

DOI: 10.7862/rb.2016.212

[10] V. Ondrejka Harbulakova, A. Estokova, P. Purcz, A. Luptakova, Correlation analysis as a method for concrete deterioration investigation, ICOCEE, Nevsehir, Cappadocia, Turkey, 943-949. (2015).

[11] E. Kreyszig, Advanced Engineering Mathematics, John Wiley and sons, 10th edition. (2011).

[12] Y. Dodge, The Oxford Dictionary of Statistical Terms, OUP. (2003).