Thermodynamic Modeling of the Effects of Wollastonite-Silica Fume Combination in the Cement Hydration and Sulfate Attack

Document Type : Research Papers


1 Department of Civil Engineering, Shahid Rajaee Teacher Training University, Lavizan, Tehran, Iran

2 Faculty of Civil Engineering, Shahid Rajaee Teacher Training University,

3 Faculty of Civil Engineering, Shahid Rajaee Teacher Training University


Sulfate attack is a series of physico-chemical reactions between hardened cement paste and sulfate ions. Sulfate ion penetration into the hydrated cement results in the formation of voluminous and deleterious phases such as gypsum and ettringite which are believed to cause deterioration and expansion of concrete. Concrete deterioration due to sulfate attack depends on many parameters, however, in experimental studies, the implementation of the parameters and obtaining the results in a short time are too difficult. In this paper the effect of wollastonite, with and without silica fume, on the performance of cement based materials during hydration and magnesium sulfate attack was studied by thermodynamic modeling. Thermodynamic modelling was carried out using the Gibbs free energy minimization program GEMS. By this method, in addition to investigating the type and volume of the produced material, the optimal substitution percentage of wollastonite and silica fume were studied as well. In sulfate attack, especially at higher percentages of substitution, wollasonite is not very effective in itself. Wollasonite replacement has a reverse effect on monosulfate and ettringite phases. Volume of these phases increases with addition of the substitution percentage. Substituting a portion of the cement with wollastonite and silica fume would improve sulfate resistance. Substitution of 5% of wollasonite and 10% of silica fume has shown the best performance, highest increase in C-S-H gel volume and reduction in harmful phases such as gypsum, ettringite and brucite.


Main Subjects

Al-Amoudi, O.S.B. (2002). "Attack on plain and blended cements exposed to aggressive sulfate environments", Cement and Concrete Composites, 24(3), 305-316.
Arshad, A., Shahid, I., Anwar, U.H.C., Baig, M.N., Khan, S. and Shakir, K. (2014). "The wastes utility in concrete", International Journal of Environmental Research, 8(4), 1323-1328.
Askarinejad, A. (2017). "Using different methods of nanofabrication as a new way to activate supplementary cementitious materials; a review", Civil Engineering Infrastructures Journal, 50(1), 1-19.
American Society for Testing and Materials. Committee C-9 on Concrete and Concrete Aggregates. (2005). Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete, ASTM C, 685.
Balonis, M. (2010). "The influence of inorganic chemical accelerators and corrosion inhibitors on the mineralogy of hydrated Portland cement systems", PhD. Thesis, Aberdeen University.
Crooks, A.F. (1999). Wollastonite in south Australia, South Australian Department of Primary Industries and Resources, Report Book 99/16.
Damidot, D., Lothenbach, B., Herfort, D. and Glasser, F.P. (2011). "Thermodynamics and cement science", Cement and Concrete Research, 41(7),  679-695.
Gollop, R.S. and Taylor, H.F.W. (1992). "Microstructural and microanalytical studies of sulfate attack, I: Ordinary Portland cement paste", Cement and Concrete Research, 22(6), 1027-1038.
Gosh, N. (2002). Advances in cement technology: Chemistry, manufacture, and testing, Tech Books International, New Delhi.
Jahim, H. (2010). "The use of wollastonite to enhance fresh and mechanicalproperties of concrete", M.Sc. Thesis, Baghdad University.
Kalla, P., Misra, A., Gupta, R.C., Csetenyi, L., Gahlot, V. and Arora, A. (2013). "Mechanical and durability studies on concrete containing wollastonite–fly ash combination", Construction and Building Materials, 40, 1142-1150.
Kolani, B., Buffo-Lacarrière, L., Sellier, A., Escadeillas, G., Boutillon, L. and Linger, L. (2012). "Hydration of slag-blended cements", Cement and Concrete Composites, 34(9), 1009-1018.
Kulik, D.A., Wagner, T., Dmytrieva, S.V, Kosakowski, G., Hingerl, F.F., Chudnenko, K.V. and Berner, U.R. (2013). "GEM-Selektor geochemical modeling package: Revised algorithm and GEMS3K numerical kernel for coupled simulation codes", Computational Geosciences, 17(1), 1-24.
Kunther, W. (2012). "Investigation of sulfate attack by experimental and thermodynamic means", M.Sc. Thesis, EPFL Swiss University.
Kunther, W., Lothenbach, B. and Scrivener, K.L. (2013). "On the relevance of volume increase for the length changes of mortar bars in sulfate solutions", Cement and Concrete Research, 46, 23-29.
Lothenbach, B. (2010). "Thermodynamic equilibrium calculations in cementitious systems", Materials and Structures, 43(10), 1413-1433.
Lothenbach, B., Bary, B., Le Bescop, P., Schmidt, T. and Leterrier, N. (2010a). "Sulfate ingress in Portland cement", Cement and Concrete Research, 40(8), 1211-1225.
Lothenbach, B., Damidot, D., Matschei, T. and Marchand, J. (2010b). "Thermodynamic modelling: State of knowledge and challenges", Advances in Cement Research, 22(4), 211-223.
Lothenbach, B., Scrivener, K. and Hooton, R.D. (2011). "Supplementary cementitious materials", Cement and Concrete Research, 41(12), 1244-1256.
Lothenbach, B., Le Saout, G., Ben Haha, M., Figi, R. and Wieland, E. (2012). "Hydration of a low-alkali CEM III/B–SiO 2 cement (LAC)", Cement and Concrete Research, 42(2), 410-423.
Mathur, R., Mishra, A.K. and Goel, P. (2007). "Marble slurry dust and wollastonite-inert mineral admixture for cement concrete", Indian Highways, 35(12), 41-46.
Maxim, L.D. and Mcconnell, E.E. (2005). "A review of the toxicology and epidemiology of wollastonite", Inhalation Toxicology, 17(9), 451-466.
Piasta, W., Marczewska, J. and Jaworska, M. (2014). "Some aspects and mechanisms of sulphate attack", Structure and Environment, 6(3), 19-24.
Ramezanianpour, A., Pourbeyk, P. and Modi, F. (2012). "The durability of rice husk ash concrete against sulfate attack", Amirkabir Journal of Civil and Environmental Engineering, 45(1),13-23.
Ransinchung RN, G.D. and Kumar, B. (2009). "Investigations on pastes and mortars of ordinary Portland cement admixed with wollastonite and microsilica", Journal of Materials in Civil rngineering, 22(4), 305-313.
Rothstein, D., Thomas, J.J., Christensen, B.J. and Jennings, H.M. (2002). "Solubility behavior of Ca-, S-, Al-, and Si-bearing solid phases in Portland cement pore solutions as a function of hydration time", Cement and Concrete Research, 32(10), 1663-1671.
Tarighat, A. and Afzali, O. (2016). "Study of mechanical properties and some durability indices of concrete containing microplasma wollastonite and silica fume pozzolan", Journal of Civil and Enviroment Engineering, 47(1), 47-57.
Thoenen, T., Hummel, W., Berner, U. and Curti, E. (2014). The PSI/Nagra chemical thermodynamic database 12/07, Paul Scherrer Institute, Villigen PSI, Switzerland.

Tixier, R. and Mobasher, B. (2003). "Modeling of damage in cement-based materials subjected to external sulfate attack. I: Formulation", Journal of Materials in Civil Engineering, 15(4), 305-313.

Zelic, J., Radovanovic, I. and Jozic, D. (2007). "The effect of silica fume additions on the durability of Portland cement mortars exposed to magnesium sulfate attack", Materials and Technology, 41(2), 91-94.
De Weerdt, K., Ben Haha, M., Le Saout, G., Kjellsen, K.O., Justnes, H. and Lothenbach, B. (2011). "Hydration mechanisms of ternary Portland cements containing limestone powder and fly ash", Cement and Concrete Research. 41(3), 279-291.
Whittaker, M. and Black, L. (2015). "Current knowledge of external sulfate attack", Advances in Cement Research, 27(9), 532-545.