Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of Lithium Silicate and Silane Applications for Sealing Concrete Barrier Walls Exposed to Chloride-Based Deicing Salts
Chloride-induced corrosion of reinforcing steel in concrete structures is a leading cause of deterioration of highway infrastructure in cold regions, where the source of chlorides is usually deicing salts applied to roads and bridges during winter to melt ice. The objective of this work was to evaluate applications of lithium silicate and a combination of lithium silicate and silane for sealing concrete barrier walls exposed to chloride-based deicing salts. The procedures followed in this research involved selection of three field sites for topical applications of lithium silicate and silane, chloride concentration sampling before and after treatment, and chemical analysis of the samples. The field sites were all located along the newly constructed Mountain View Corridor in northern Utah and were evaluated after each of the first two winters. The results of the statistical analyses completed in this research indicate that treatment with silane and lithium silicate and treatment with lithium silicate by itself provide 79.9 and 42.4 percent reductions, on average, in chloride concentration, respectively, compared to the control, which was not treated. In addition, the data indicate that the chloride concentration of the deeper lift was, on average, 64.2 percent less than the chloride concentration of the shallower lift, where the depth ranged from 0 mm to 13 mm (0 in. to 0.5 in.) and from 13 mm to 25 mm (0.5 in. to 1.0 in.) for the shallower and deeper lifts, respectively. Finally, the data indicate that the chloride concentration increased by 258.0 and 330.2 percent, on average, after the first and second winters, respectively, compared to the baseline values measured before the wall sections were exposed to chlorides. Evaluation of the permanency of the treatments will require continued monitoring for several more years.
Evaluation of Lithium Silicate and Silane Applications for Sealing Concrete Barrier Walls Exposed to Chloride-Based Deicing Salts
Chloride-induced corrosion of reinforcing steel in concrete structures is a leading cause of deterioration of highway infrastructure in cold regions, where the source of chlorides is usually deicing salts applied to roads and bridges during winter to melt ice. The objective of this work was to evaluate applications of lithium silicate and a combination of lithium silicate and silane for sealing concrete barrier walls exposed to chloride-based deicing salts. The procedures followed in this research involved selection of three field sites for topical applications of lithium silicate and silane, chloride concentration sampling before and after treatment, and chemical analysis of the samples. The field sites were all located along the newly constructed Mountain View Corridor in northern Utah and were evaluated after each of the first two winters. The results of the statistical analyses completed in this research indicate that treatment with silane and lithium silicate and treatment with lithium silicate by itself provide 79.9 and 42.4 percent reductions, on average, in chloride concentration, respectively, compared to the control, which was not treated. In addition, the data indicate that the chloride concentration of the deeper lift was, on average, 64.2 percent less than the chloride concentration of the shallower lift, where the depth ranged from 0 mm to 13 mm (0 in. to 0.5 in.) and from 13 mm to 25 mm (0.5 in. to 1.0 in.) for the shallower and deeper lifts, respectively. Finally, the data indicate that the chloride concentration increased by 258.0 and 330.2 percent, on average, after the first and second winters, respectively, compared to the baseline values measured before the wall sections were exposed to chlorides. Evaluation of the permanency of the treatments will require continued monitoring for several more years.
Evaluation of Lithium Silicate and Silane Applications for Sealing Concrete Barrier Walls Exposed to Chloride-Based Deicing Salts
Guthrie, W. Spencer (Autor:in) / Young, David G. (Autor:in) / Argyle, Hillary M. (Autor:in) / Waters, Tenli (Autor:in)
16th International Conference on Cold Regions Engineering ; 2015 ; Salt Lake City, Utah
Cold Regions Engineering 2015 ; 370-381
17.07.2015
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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