Numerical Modelling of Degradation of Cement Paste under External Sulfate Attack

Abstract:

In this study, a numerical method is developed to simulate the degradation of cement paste when subjected to sodium sulfate solutions. The proposed numerical method accounts for ionic diffusion, chemical reactions and the damage propagations, which are three main phenomena accompanied with degradation. A modified Poisson-Nernst-Planck model is developed to model the diffusion of multiple ions in a gradually degraded material. The cracking suction effect is introduced to consider the suction action caused by the newly-formed unsaturated cracks, which would accelerate the diffusion process within the cracking area. The proposed model is applied to model the experiments reported in the literature. The numerical results obtained agree very well with those from experiments.

• Periodical: Applied Mechanics and Materials (Volume 846)
• Pages: 127-132
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.846.127
• Online since: July 2016
• Authors: Yu Guo Yu, Amar Khennane, Yi Xia Zhang*
• Keywords: Chemical Reaction, Cracking Suction Effect, Diffusion, Finite Element Model, Hydrated Cement

References

[1] F.P. Glasser, J. Marchand, E. Samson, Durability of concrete—degradation phenomena involving detrimental chemical reactions, Cem Concr Res. 38(2) (2008) 226-46.

DOI: 10.1016/j.cemconres.2007.09.015

[2] U. Angst, R. Hooton, J. Marchand, C. Page, R. Flatt, B. Elsener, et al., Present and future durability challenges for reinforced concrete structures, Mater Corros. 63(12) (2012) 1047-51.

DOI: 10.1002/maco.201206898

[3] A. Neville, The confused world of sulfate attack on concrete, Cem Concr Res. 34(8) (2004) 1275-96.

[4] E. Samson, J. Marchand, Modeling the transport of ions in unsaturated cement-based materials, Comput Struct. 85(23) (2007) 1740-56.

DOI: 10.1016/j.compstruc.2007.04.008

[5] J.J. Kaluarachchi, J. Morshed, Critical assessment of the operator-splitting technique in solving the advection-dispersion-reaction equation: 1. First-order reaction, Adv Water Resour. 18(2) (1995) 89-100.

DOI: 10.1016/0309-1708(95)00001-y

[6] K.T. MacQuarrie, K.U. Mayer, Reactive transport modeling in fractured rock: A state-of-the-science review, Earth-Sci Rev. 72(3) (2005) 189-227.

DOI: 10.1016/j.earscirev.2005.07.003

[7] E. Samson, J. Marchand, K. Snyder, J. Beaudoin, Modeling ion and fluid transport in unsaturated cement systems in isothermal conditions, Cem Concr Res. 35(1) (2005) 141-53.

DOI: 10.1016/j.cemconres.2004.07.016

[8] E. Samson, J. Marchand, Numerical solution of the extended Nernst–Planck model, J Colloid Interface Sci. 215(1) (1999) 1-8.

DOI: 10.1006/jcis.1999.6145

[9] E. Samson, G. Lemaire, J. Marchand, J. Beaudoin, Modeling chemical activity effects in strong ionic solutions, Comput Mater Sci. 15(3) (1999) 285-94.

DOI: 10.1016/s0927-0256(99)00017-8

[10] J. -F. Daian, Condensation and isothermal water transfer in cement mortar Part I—Pore size distribution, equilibrium water condensation and imbibition, Transport Porous Med. 3(6) (1988) 563-89.

DOI: 10.1007/bf00959103

[11] J. Mazars, G. Pijaudier-Cabot, Continuum damage theory-application to concrete, J ENG MECH. 115(2) (1989) 345-65.

DOI: 10.1061/(asce)0733-9399(1989)115:2(345)

[12] Y. Maltais, E. Samson, J. Marchand, Predicting the durability of Portland cement systems in aggressive environments—laboratory validation, Cem Concr Res. 34(9) (2004) 1579-89.

DOI: 10.1016/j.cemconres.2004.03.029

[13] S. Sarkar, S. Mahadevan, J. Meeussen, H. Van der Sloot, D. Kosson, Numerical simulation of cementitious materials degradation under external sulfate attack, Cem Concr Compos. 32(3) (2010) 241-52.

DOI: 10.1016/j.cemconcomp.2009.12.005