Experimental Research of Technology for Strengthening Reinforced Concrete Columns with Carbon Fibers

Abstract

Reinforcement of columns (piers) is usually accomplished by increasing cross-section through building-up, injecting reinforcing solutions and external reinforcement. The most and progressive method for strengthening is currently external reinforcement, its essence is to glue high-strength sheets, plates or strips (lamellas) onto structure surface with the help of special adhesives. Scientists pay special attention to theoretical and experimental studies of design solutions for external reinforcement of vertical load-bearing structures. Unfortunately, the results of such studies, for example, influence of technology for execution of works on strengthening efficiency are virtually absent. Therefore, the objective of this paper is to carry out experiments with the purpose to study influence of technological factors on efficiency in strengthening of reinforced concrete structures, which absorb compressive forces. The experimental studies have been made in six series that changed the technology of executed works while using various technological factors. Among the main factors are the following: presence/absence of acute angles; preparation of a base (surface coating); method for gluing reinforcing materials to a structure. A criterion for evaluation of technology efficiency has been breaking strength for axial compression of reinforced samples. Адрес для переписки Молодед Александр Станиславович Киевский национальный университет строительства и архитектуры просп. Воздухофлотский, 31, 03037, г. Киев, Украина Тел.: +380 67 306-73-59 molodid2005@ukr.net Address for correspondence Molodid Oleksandr S. Kyiv National University of Construction and Architecture 31, Povitroflotsky Ave., 03037, Kyiv, Ukraine Tel.: +380 67 306-73-59 molodid2005@ukr.net