DETERMINATION OF CHLORIDE DIFFUSION COEFFICIENT IN CARBONATED CONCRETE CONTAINING SILICA-FUME

Document Type : Research Article

Authors

1 CIVIL ENGINEERING DEP., QAZVIN BRANCH, ISLAMIC AZAD UNIVERSITY, QAZVIN, IRAN

2 CIVIL ENG. DEP., AMIR KABIR UNIVERSITY OF TECH. TEHRAN, IRAN

Abstract

The deterioration of concrete structures is a non-linear and complex phenomenon which is caused by different phenomena. Carbonation is known as one of the major reasons of concrete deterioration. Carbonation has two different effects on concrete structures. Carbonation may have a positive effect against corrosive materials because of its effect in reducing the concrete porosity by changing calcium hydroxide to calcium carbonate. On the other hand, carbonation may have a major role in improving corrosion by reducing the pH of concrete and omitting of passive layer. Although literatures on carbonation have been vast, there are so few studies in carbonation of concrete containing silica fume. In this research the effect of carbonation in reducing of the porosity of concretes containing silica fume was studied. For this reason, concrete specimens with different water to binder ratios (w/c = 0, 0.35 and 0.5) and silica fume percentage (S.F = 0%, 5% and 10%) were made and carbonated in different ages (28 and 90 days). The porosity of carbonated concretes compared with control specimens by different experiments. Finally, a mathematical model for concrete porosity reduction under carbonation phenomena was developed based on experimental results.

Keywords

Main Subjects

References

[1] Sang-Hwa Jung, Young-Jun Choi, Bong-Chun Lee, Influence of carbonation on the chloride diffusion in concrete, construction material research center, Korea institute of construction materials, 1465-4, PP. 1191-1196.
[2] David Conciatori, Francine Laferrier, Eugen Bruhwiler, 2010, Comprehensive modeling of chloride ion and water ingress into concrete considering thermal and carbonation state for real climate, Cement and Concrete Research 40, 109-118.
[3] C.C.Page, O.Vennesland (1983) "Effect of Carbonation on Chloride Binding" Materials and Constructions, Vol. 16, No. 19
[4] A.Suryavanshi, R.Swamy (1996) "Stability of Friedels Salt in Carbonated Concrete Structural Elements" Cement And Concrete Research, Vol.26, No.5, pp.729-741
[5] K.Maekawa, T.Ishida (2002) “Service Life Evaluation of Reinforced Concrete Under Coupled Forces and Environmental Actions” Proceedings of the JCI, Vol.20, No2, pp.691-696
[6] K.Maekawa, T.Ishida (2003)”Multi-Scale Modeling of Concrete Performance Integrated Material and Structural Mechanics” Journal of Advanced Concrete Technology, Vol.1 pp.91-126
[7] K.Maekawa, T.Ishida (2004)”Theoretical Identified Strong Coupling of Carbonation Rate and Thermodynamic Moisture States in Microspores of Concrete” Journal of Advanced Concrete Technology, Vol.2 pp.213-222
[8] M.Lin, M.Liang (2003) “Modeling of Transport of Multiple Chemicals in Concrete Structures: Synergetic Effect Study” Cement and Concrete Research, Vol.33 pp.1917-1924
[9] O.Burkan Isgor, A.Ghani Razaqpur (2005) “Advanced Modeling of Concrete Deterioration due to Reinforcement Corrosion”
[10] W.Puatatsananon, V.E.Saouma, (2005) “Nonlinear Coupling of Carbonation and Chloride Diffusion in Concrete” Journal of Materials in Civil Engineering, v 17, No 3, pp 264-275
[11] H.Song, S.Pack, C.Lee (2006) “service Life Prediction of Concrete Structures Under Marine Environment Considering Coupled Deterioration”
[12] S.J.H. Meijers, J.M.J.M. Bijen, R. de Borst and A.L.A. Fraaij, 2005, "Computational results of a model for chloride ingress in concrete including convection, drying-wetting cycles and carbonation", Materials and structures 38, 145-154.
[13] Mohamed BOULFIZA, Koji SAKAI, Nemkumar BANTHIA, Hidenori YOSHIDA, 2001, "Analytical study on synergistic effects of carbonation and chloride ion attack on concrete" , Proceedings of the Japan Concrete Institute, Vol. 23, No.2, PP. 439-444.
[14] IN-SEOK YOON and CHANG-SOO LEE, 2004, "Prediction of chloride profile of concrete under combined deterioration of carbonation and chloride ions", Consec04, Seoul, Korea, PP. 353-360.
[15] Jack M. Chi, Ran Huang, C. C. Yang, 2002 " EFFECTS OF CARBONATION ON MECHANICAL PROPERTIES AND DURABILITY OF CONCRETE USING ACCELERATED TESTING METHOD", Journal of Marine Science and Technology, Vol. 10, No. 1, pp. 14-20
Amirkabir Journal of Civil Engineering
Volume 51, Issue 2
July and August 2019
Pages 367-376

Files

Share

How to cite

Statistics