Abstract
This paper presents and discusses the procedures adopted for repairing and strengthening a damaged reinforced concrete corbel of an industrial biomass boiler. The reinforced concrete corbel was subjected to concrete spalling, favoring the risk of the main tie reinforcement slip in the anchorage zone. The proposed solution involved a local repair with a polymeric mortar and subsequent strengthening using carbon fiber reinforced polymer (FRP) sheets, attending the requirements imposed by the in site conditions and the design plans. The intervention allowed the confinement of the concrete zone subjected to spalling and provided additional safety for the main tie reinforcement of the corbel. The applied technique was demonstrated to be fast, reliable, practical, and cheaper than other available solutions, such as section enlargements with concrete jacketing.
Highlights
Corbels are structural members projecting from columns or walls that are generally used to support precast concrete/steel beams or to allow the execution of expansion joints in concrete structures
The lateral faces of the corbels were cut using a diamond saw, and carbon fiber reinforced polymers (CFRP) laminate strips of 2 mm by 16 mm were attached into the slits using epoxy adhesive
It should be observed that an equivalent tie was assumed in order to simulate the simultaneous contribution of the CFRP strengthening
Summary
Corbels are structural members projecting from columns or walls that are generally used to support precast concrete/steel beams or to allow the execution of expansion joints in concrete structures. The lateral faces of the corbels were cut using a diamond saw, and CFRP laminate strips of 2 mm by 16 mm were attached into the slits using epoxy adhesive This technique, known as near‐surface mounted (NSM), is attractive if the reinforcement concrete cover is large enough,Fiagnudre 1i.tsCCooerrfbbfeiecllissettnrreecnnyggtthhheaennsedbeuesningpprroevsetrnessbinyg sbeavrser(Saol urrcees:eVarocuhmearsrdd([[K11]]u))..ntal et al [6], Al‐Mahmoud et al [7] and Barros and Dias [8]). This technique, known as near‐surface mounted (NSM), is attractive if the reinforcement concrete cover is large enough, and its efficiency has been proven by several researchers (Kuntal et al [6], Al‐Mahmoud et al [7] and Barros and Dias [8]). The field intervention was successful, and after three years, the repaired structure has been working properly without presenting pathologies like cracks or concrete spalling
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