Abstract
This paper presents sensitivity of service life extension and CO2 emission due to silane (alkyltriethoxysilane) treatment on concrete structures under time-dependent chloride attack. The service life is predicted by the Crank–Nicolson-based finite difference approach for avoiding the complexity in solving Fick’s second law. The complexity occurs due to time-dependent chloride attack and nonconstant diffusion coefficient of concrete with silane treatment. At the application time of silane treatment, the cumulative CO2 emission is assessed. The effectiveness of silane treatment is defined as the ratio of the service life extension to the cumulative CO2 emission assessed within the corrosion-free service life. The service life extension is defined as the difference between corrosion-free service life of concrete structures without and with time-based application of silane treatment. From the study, the diffusion of chlorides in concrete with silane treatment is found to be retarded. In comparison, the strategy without deterioration of silanes during effective duration is more suitable for service life extension but less effective than that with deterioration. In the sensitivity analysis, there are up to eight parameters to be determined. The service life of concrete structures without silane treatment is most sensitive to the water-to-cement ratio and the threshold depth of concrete structures. Considering only five parameters in silane treatment strategies, the service life is most sensitive to the first application time of silane treatment. The cumulative CO2 emission is most sensitive to either the first application time of silane treatment or the amount of CO2 emission per application.
Highlights
Concrete structures have been used in construction industry for years
Silane treatment, which is categorized as a kind of surface treatment, is one of the most favorite repair methods applied on concrete surface for retarding the transport of chloride ions for service life extension of concrete structures [7, 8]
Silane treatment was categorized as one kind of penetrants for hydrophobic treatment aiming to slow down the diffusion of chloride ions in concrete structures [23]
Summary
Concrete structures have been used in construction industry for years. After a period of time, those structures deteriorate due to mechanical loading or environmental attack. E second option is applying a proper repair plan to extend the service life of concrete structures prior to severe deterioration [6]. Silane treatment, which is categorized as a kind of surface treatment, is one of the most favorite repair methods applied on concrete surface for retarding the transport of chloride ions for service life extension of concrete structures [7, 8]. Is study presents assessment of the environmental impact in terms of the CO2 due to silane (alkyltriethoxysilane) treatment for extending corrosion-free service life extension of chloride-exposed concrete structures. E ratio of the service life extension to the amount of cumulative CO2 emission is defined as the effectiveness of silane treatment for comparing different repair strategies. The sensitivity of the service life and the cumulative CO2 is determined in order to observe the effect of each parameter
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