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Title: A study of the feasibility of methods for increasing the load-carrying capacities of existing concrete beams
Authors: Cox, F. B. (Frank B.)
Keywords: Adhesives
Concrete beams
Epoxy resins
Loads (forces)
Reinforced concrete
Reinforcing methods
Static tests
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-70-3.
Description: Technical report
Abstract: The primary objective of this investigation was to determine the feasibility of increasing the load-carrying capacities of existing reinforced concrete beams by building up their cross sections with additional reinforcement adhesively bonded to their horizontal and/or vertical faces. Waterways Experiment Station correspondence with leading chemical companies indicated that either of several epoxy-resin systems would provide a bonding strength such that the entire built-up section would act as though it were monolithic; therefore, only two of the most highly recommended systems were tested for their bonding strengths. After the most suitable adhesive (epoxy-resin system) was determined, 14 beams (11 built-up beams with clear spans of 6 ft, and 3 built-up beams with clear spans of 12 ft), excluding the control beams, were cast and tested using additional reinforcement consisting of adhesively bonded steel strips or sheets, precast reinforced concrete panels, or prestressed concrete panels, either singly or in combination. The results of these tests indicated that additional shear and tensile reinforcement can be provided by adhesively bonding these materials or any combination of the materials to the vertical and horizontal faces of the existing members; however, the most suitable and practical method tested was with built-up sections utilizing adhesively bonded precast concrete panels; therefore, it is the procedure most highly recommended at this time. Recommendations are made for the design and fabrication of built-up members, but it should be noted that all conclusions and recommendations were based on short-time static test and could be subject to revision if test data were available on members tested under either sustained or dynamic loading conditions.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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