Fiber reinforced polymer (FRP) composite materials are the standard for strengthening, retrofitting, and repairing concrete structures. Typically, FRP strips are fastened to the concrete with epoxy adhesive. Engineers at the University of Wisconsin-Madison have developed a new method of fastening the FRP strips using mechanical anchors (Composites Fabrication Magazine, Sep. 2004). To evaluate the new fastening method, 10 specimens of pultruded FRP strips mechanically fastened to highway bridges were tested for bearing strength. The strength measurements (recorded in mega pascal units, Mpa) are shown in the table. Use the sample data to find an interval that is likely to contain the bearing strength of a pultruded FRP strip.

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240.9 248.8 215.7 233.6 2314 230.9 225.3 2473 235.5 238.