The presence of stress is
shown to have a significant impact on chloride ions in concrete. Reinforced concrete
is usually durable and cost-effective which has
resulted in its widespread use for construction, however, the concrete subjected
to environment and load has become increasingly apparently that attacked by aggressive
agents such as chloride ion. In this study, the coupling influences are stress effects and environmental problems
on the coastline concrete durability have been investigated. A series of
cyclic of a wet-dry cycle and submersion tests were performed onto the stressed
concrete to obtain an understanding of the physical mechanisms causing the accumulation
of chlorides in the interior pores of concrete under different stress types and
exposure environments, based on the same duration. Specimens were prepared and subjected to NaCl solution
in a wet-dry cycle and submersion, the chloride in the tension zone is gradual with
increasing the stress level, as well as the chloride ion in the wet-dry cycle, is
increasing the number of cycles. The apparent diffusion coefficient of each specimen
was calculated respectively, the profile of concentration at a different section of tension
and compression zones were presented in influence factors of the number of cycles,
the length of drying phase, and periodic wetting cycles with sodium solution was
discussed. After employedFick’s second law, the results suggested Da in a wet-dry cycle is much
higher than the Da
References
[1]
Chalee, W. and Jaturapitakul, C. (2009) Effect of w/b Ratio and Fly Ash Fineness on Chloride Diffusion of Concrete in Marine Environment. Material and Structure, 42, 505-514. https://doi.org/10.1617/s11527-008-9398-2
[2]
Hong, K. (1998) Cyclic Wetting and Drying and Its Effects on Chloride Ingress in Concrete. University of Toronto, Toronto, 31-63.
[3]
Ishida, T., Iqbal, P.O. and Anh, H.T.L. (2009) Modeling of Chloride Diffusivity Coupled with Nonlinear Binding Capacity in Sound and Cracked Concrete. Cement and Concrete Research, 39, 913-923. https://doi.org/10.1016/j.cemconres.2009.07.014
[4]
Ismail, M., Toumi, A., Francois, R. and Gagne, R. (2008) Effect of Crack Opening on the Local Diffusion of Chloride in Cracked Mortar Samples. Cement and Concrete Research, 38, 1106-1111. https://doi.org/10.1016/j.cemconres.2008.03.009
[5]
Stanish, K.D., Hooten, R.D. and Thomas, M.D.A. (2001) Testing of Chloride Penetration Resistance of Concrete. University of Toronto, Toronto, 6-8.
[6]
Song, H.W., Lee, C.H. and Ann, K.Y. (2008) Factors Influence Chloride Transport in Concrete Expose to Marine Environment. Cement and Concrete Composite, 30, 113-121. https://doi.org/10.1016/j.cemconcomp.2007.09.005
[7]
Win, P.P., Watanabe, M. and Machida, A. (2004) Penetration Profile of Chloride Ion in Cracked Reinforced Concrete. Cement and Concrete Research, 34, 1073-1079. https://doi.org/10.1016/j.cemconres.2003.11.020
[8]
Ahmad, S. (2003) Reinforcement Corrosion in Concrete Structures, Its Monitoring and Service Life Prediction—A Review. Cement and Concrete Composites, 25, 459-471. https://doi.org/10.1016/S0958-9465(02)00086-0
[9]
Wang, J.J., Muhammad Basheer, P.A., Nanukuttan, S.V., Long, A.E. and Bai, Y. (2016) Influence of Service Loading and the Resulting Micro-Cracks on Chloride Resistance of Concrete. Construction and Building Materials, 5, 56-66. https://doi.org/10.1016/j.conbuildmat.2016.01.005
[10]
Ye, H.L., Fu, C.Q., Jin, N.G. and Jin, X.Y. (2014) Influence of Flexural Loading on Chloride Ingress in Concrete Subjected to Cyclic Drying-Wetting Condition. Computers and Concrete, 15, 152-183. https://doi.org/10.12989/cac.2015.15.2.183