Long-Term Performance of Epoxy Adhesive Anchor Systems (2013) / Chapter Skim
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D-1 A P P E N D I X D Anchor Pullout Tests -- University of Stuttgart
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D-2 ANCHOR PULLOUT TESTS -- UNIVERSITY OF STUTTGART This section presents the test program conducted at the University of Stuttgart Intsitüt für Werkstoffe im Bauwesen (IWB) to investigate the effect of various parameters on the sustained load performance of three adhesive anchor systems.
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D-3 The transducer mount was placed on top of the test specimen before the tripod for the hydraulic ram and the load cell was installed (Figure 2)
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D-4 and a nut (Figure 4)
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D-5 Figure 7 shows the transducer mount after the installation of the tripod. The cross-beam with the transducer was adjusted, fixed to the mount, and locked with two size M10 nuts.
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D-6 Figure 8: Illustration of the large heating chamber (containing three test rigs)
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D-7 Figure 10: Disc-spring package. Figure 11: Disc-spring characteristics.
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D-8 Figure 12: Loading system. Figure 13: Loading system installed.
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D-9 Concrete Test Member The concrete test members for the short-term tests and the sustained load (creep) tests were poured in steel cylinders with an 8" inner diameter, 6" height, and a wall thickness of ¼" (Figure 14)
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D-10 Following the pour, the concrete was cured according to DIN EN 206-1 for 28 days. Concrete compressive strength was determined by testing the cubes in general accordance with DIN EN 206-1 on a Toni-Technik model 1515 compression machine at the laboratory of the IWB, University of Stuttgart (Figure 15)
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D-11 Table 3: Concrete series US-B average compressive strength. Concrete Series Pour Date Average Compressive Strength (psi)
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D-12 Load. The tension in the anchor was measured indirectly as a compressive reaction of either the hydraulic ram or the compression spring in the test apparatus.
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D-13 Instrument Calibration Displacement in short-term tests. The Novotechnik Model TRS25 potentiometric linear transducer used in the short-term tests was calibrated on May 26, 2010, using the Mitutoyo Gauge Block Set No.
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D-14 chambers were not calibrated separately but in combination with their controller and heating elements, using an original test specimen with a thermocouple-equipped anchor installed. This temperature calibration specimen was calibrated against the Testo Model t110 digital thermometer.
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D-15 Figure 17: Climate chamber. Data management and acquisition Generally a Microsoft compatible computer was used for the data acquisition.
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D-16 Due to minor fluctuations in the 9 volt power supply, the Data Translation program recorded the power supply voltage with each data reading and the readings of the transducer positions were appropriately adjusted to a normalized 9 volt power supply. Data Acquisition Software for Short-term Tests For short-term testing, DIAdem 10 was used, published by National Instruments (Figure 18)
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D-17 daily. Therefore it was decided to build a very robust setup that only triggered the data acquisition of the measuring device in a 10 minute interval and wrote the transferred data as a simple ASCII-file to the hard disk (Figure 19)
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D-18 drilled perpendicular to the surface of the concrete and to the correct depth. The holes were drilled 0.6" deeper than then embedment depth to allow for the placement of a centering guide at the bottom of the hole.
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D-19 Prior to installation, a centering tool (Figure 22 and Figure 23) was inserted into the hole and a concentric circle was drawn on the surface of the concrete to aid in centering the anchor.
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D-20 Figure 24: Centering guide with anchor. Figure 25: Anchor with centering ring.
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D-21 22-kip hydraulic ram, the HBM Model C6 45-kip load cell and the loading rod were placed together on top of the confining plate. The coupler was attached to the anchor and connected to the loading rod.
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D-22 installed to the anchor as described in the short-term tests. The loading rod was passed through the spring package and the upper end was connected to the bottom of the coupler.
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D-23 keeping it in position during testing. After installation, the temperature was raised to the test temperature.
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