Sensitivity of Service Life Extension and CO₂ Emission due to Repairs by Silane Treatment Applied on Concrete Structures under Time‐Dependent Chloride Attack

Abstract

is paper presents sensitivity of service life extension and CO 2 emission due to silane (alkyltriethoxysilane) treatment on concrete structures under time-dependent chloride attack. e service life is predicted by the Crank-Nicolson-based finite difference approach for avoiding the complexity in solving Fick's second law. e 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 CO 2 emission is assessed. e effectiveness of silane treatment is defined as the ratio of the service life extension to the cumulative CO 2 emission assessed within the corrosion-free service life. e 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. e 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. e cumulative CO 2 emission is most sensitive to either the first application time of silane treatment or the amount of CO 2 emission per application.

Influence of Recycled Glass on Strength Development of Alkali-Activated High-Calcium Fly Ash Mortar

“…For further studies, it is recommended to apply the fndings in this study to construction practice [51,52] and also compare them to other materials [53,54].…”

Use of a Piezoelectric Bender Element for the Determination of Initial and Final Setting Times of Metakaolin Geopolymer Pastes, with Applications to Laterite Soils

“…In spite of its aforementioned advantages, however, cement production requires high energy input, leading to environmental concerns [ 16 , 17 ]. Hence, a new alternative building material is required for civil engineering works.…”

Sandy Soil Improvement Using MICP‐Based Urease Enzymatic Acceleration Method Monitored by Real‐Time System

“…e need of ground improvement has been growing up; hence, many improvement methods have also been invented, such as biomediated soil improvement method. is method showed greater potential in terms of performance and environmental sustainability [2], which has been an important in construction [3][4][5]. In addition, not only biologically controlled and induced mechanisms were important, but also other encountered in situ factors during microbially induced calcite precipitation (MICP) should be taken into account.…”