Fiber
reinforced polymer (FRP) composites have been used extensively in repair
applications over the last two
decades. In addition to their high-strength and
lightweight properties, important characteristics of FRP systems for structural
repair and strengthening applications include their resistance to
electro-chemical corrosion, and speed and ease of installation. Therefore, FRP
systems can be efficient and
economical options to traditional repair methods.
However, relationship between the long-term performance of FRP repair systems
and their
construction processes are not easy to quantify. Moreover, tolerances
for most construction anomalies such as surface irregularities and crack widths
are not yet based on adequate scientific data. For instance, depending on their
state (i.e. shear or flexural) and size, cracks in the concrete may either be
left untreated or epoxy injected. The thresholds separating these approaches
may depend on technical and economical considerations. This paper presents the
current study to evaluate the effect of surface flaws on the performance of wet
lay-up FRP systems. Four types of flaws are considered; surface roughness,
surface flatness, voids and bug holes, and cracks/discontinuities. Discussions
of test results and recommendations are also provided.