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- W600324144 abstract "This research study is motivated by the need to reduce the costs of maintenance and repair of the aging transportation infrastructure in the United States. The proposed approach is to use self-healing concrete. The objectives of this study were: (1) to evaluate the effects of preparation parameters (namely, temperature, agitation rate, and pH) on the shell thickness and size (diameter) of healing agent microcapsules used in self-healing concrete; (2) to evaluate the effects of these microcapsules’ shell thicknesses and size diameters on the concrete self-healing mechanism; and (3) to test the hypothesis that composite action due to fiber reinforced polymer (FRP) confinement of cylindrical concrete specimens can improve the self-repairing properties of self-healing concrete materials. Two healing agents were evaluated for the first two objectives of this study, i.e., dicyclopentadiene (DCPD) and sodium silicate. The use of sodium silicate was considered for the third objective of this study. Based on the results of the experimental program, the following conclusions were made: (1) as the pH was reduced, the shell thickness increased for DCPD microcapsules and decreased for sodium silicate microcapsules; (2) the more uniform and coherent microcapsules were produced at a temperature of 55°C for both DCPD and sodium silicate healing agents; (3) an increase in agitation rate resulted in a decrease in the average diameter of the microcapsules for DCPD, while it minimally affected the diameter of sodium silicate microcapsules; (4) sodium silicate microcapsules were effective in repairing the concrete after cracking for contents equal to or higher than 1% of cement weight, with the best performance obtained for 5% sodium silicate content; and (5) FRP-confinement generally improved the strength and stiffness of the specimens. Additional research is needed to investigate the effects of FRP-confinement on stiffness recovery." @default.
- W600324144 created "2016-06-24" @default.
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- W600324144 date "2013-06-01" @default.
- W600324144 modified "2023-09-22" @default.
- W600324144 title "Improving the Self-Healing Properties of Concrete Materials by Using Composite Action with Fiber Reinforced Polymers" @default.
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