"The use of externally bonded fiber reinforced polymer (FRP) sheets to strengthen and rehabilitate existing concrete structures has recently received a great deal of attention within the Civil Engineering community. Numerous experimental studies have demonstrated the effectiveness of externally FRP strengthened reinforced concrete (RC) structures. However, many gaps still exist in the knowledge that is required in order for the technique to gain widespread acceptance. For instance, the bond between FRP and concrete as well as the wide variety of bond failure modes are incompletely understood and require further investigation. The overall performance of the system depends highly upon the bond quality between the concrete and the FRP laminates. Low bond strength can cause delamination and result in a premature failure of a repaired structure.
It was reported that the failure of a reinforced concrete member strengthened with FRP laminates may be caused by crushing of concrete, rupture of FRP laminates, or by the de-lamination of the FRP sheet. When a peeling or de-lamination failure can be avoided, a more effective engagement of the FRP sheet occurs which results in more efficient use of material. Previous research has noted that several items influence FRP- concrete bond strength including concrete strength, type of FRP laminate, number of layers of the FRP laminate, putty thickness and the bonding agent or epoxy saturant used. Others have also reported that the surface condition or roughness prior to strengthening has an influence on bond performance. To that end, an experimental program was undertaken to investigate the effect of a broad range of surface roughnesses and putty- thickness on bond strength. Concrete with different compressive strength were used in four different phases"--Abstract, page iii.
Maerz, Norbert H.
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
University of Missouri--Rolla
xvii, 181 pages
© 2002 Xianlin Shen, All rights reserved.
Thesis - Restricted Access
Concrete beams -- Maintenance and repair
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Shen, Xianlin, "Effect of surface roughness and putty thickness on the bond performance of FRP laminates" (2002). Masters Theses. 2261.
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