Long-Term Performance of Epoxy Adhesive Anchor Systems (2013) / Chapter Skim
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E-1 A P P E N D I X E Adhesive-Alone Tests -- University of Florida
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E-2 ADHESIVE-ALONE TESTS -- UNIVERSITY OF FLORIDA This chapter presents the test program conducted at the University of Florida to investigate the isolated sustained load and short-term creep behavior of the adhesive alone. Test apparatus This section describes the test apparatus used for the dogbone and DMTA and creep testing.
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E-3 through a hook on the lever arm as well. The self-weight of the lever arm resulted in around 80 pounds of base load on the sample and additional weight could be added to the end of the lever arm.
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E-4 DSR Machine The DMTA and creep tests were performed on a TA Instrument's AR-EX2000 DSR machine with a rectangular torsional grips and an environmental test chamber (ETC)
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E-5 Figure 6: Silicon molds for casting dogbone specimens. The dogbone samples were cast into the pre-made silicone molds directly from the tube.
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E-6 effort was made to ensure the sample thickness variation was within ±0.0008" (±0.02mm) throughout the sample length.
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E-7 and 2.12 for A and C)
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E-8 thermometer over a temperature range of 100°F to 120°F (43°C to 49 °C)
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E-9 Figure 8: Left side of testing chamber. Figure 9: Right side of testing chamber.
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E-10 modules and a NI 9205 module to interface with the instrumentation. Data acquisition for the DSR creep tests was conducted directly by the DSR machine.
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E-11 A strain versus time curve (Figure 12) for each dogbone specimen was displayed on the screen for real-time feedback.
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E-12 Figure 12: Sustained load test LabVIEW program (strain plot)
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E-13 DMTA and Creep Specimen Preparation For samples A and B, the thin sheets made for DMTA and creep testing were cut into the specimen strips after proper curing. For sample C, small white spots due to improper mixing were commonly present and care was taken to ensure that the final specimen strips were free of these imperfections.
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E-14 Dogbone Short-Term Test Procedure Once the samples were conditioned, the area where the sample was clamped by the grip was roughed by sand paper and the samples were moved into the oven of the INSTRON for several minutes to reach 110°F (43°C)
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E-15 conditioning at the test temperature, which indicated the 10 minutes condition time is sufficient for the relatively thin specimen strips to reach the stable test temperature. Throughout the test, a 0.07±0.4 pound (0.3±0.2 N)
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