Abstract
Textile reinforced concrete (TRC) has widely been used for strengthening work for deteriorated reinforced concrete (RC) structures. The structural strengthening often requires accelerated construction with the aid of precast or prefabricated elements. This study presents an innovative method to strengthen an RC slab-type element in flexure using a precast panel made of carbon TRC. A total of five RC slabs were fabricated to examine the flexural strengthening effect. Two of them were strengthened with the precast panel and grouting material and another set of two slabs was additionally strengthened by tensile steel reinforcement. The full-scale slab specimens were tested by a three-point bending test and the test results were compared with the theoretical solutions. The results revealed that the ultimate load of the specimens strengthened with the TRC panel increased by at least 1.5 times compared to that of the unstrengthened specimen. The application of the precast TRC panel and grouting material for the strengthening of a prototype RC structure verified its outstanding constructability.
Highlights
Textile reinforced concrete (TRC), referred to as fabric-reinforced cementitious matrix, is concrete strengthened with textile made by a multi-axial arrangement of high strength fibers such as carbon fiber [1]
Compared to the RC specimen, the load-carrying capacity of the SP series specimens strengthened with the TRC panel only improved by 46% on average and that of the SSP series specimens strengthened with the TRC panel and additional reinforcement improved by a maximum of 69%
KICT [17] carried out a study on the flexural performance of RC slabs strengthened with a cast-in-place TRC system by mortar shotcreting using an RC slab with the same dimensions as that of the present study and a TRC system with the same thickness as that of the TRC panel of this study
Summary
Textile reinforced concrete (TRC), referred to as fabric-reinforced cementitious matrix, is concrete strengthened with textile made by a multi-axial arrangement of high strength fibers such as carbon fiber [1]. Several research groups examined the strengthening effect of TRC on the flexural performance of reinforced concrete (RC), considering mostly the fiber type, number of textile plies, and matrix strength as parameters [3,4,5,6,7]. The strength of compared the matrix to is those of the carbon fiber applied as a reinforcing material. The strength of the matrix is known to have an insignificant effect on the flexural performance of the TRC-strengthened member. Since TRC composed of structure textile as reinforcement matrix, most practitioners achieve. Behavior of RC slab-type elements with a cast-in-place TRC in-place system wasthe experimentally investigated in KICT strengthened [17].
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