Long-Term Performance of Epoxy Adhesive Anchor Systems (2013) / Chapter Skim
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C-1 A P P E N D I X C Anchor Pullout Tests -- University of Florida
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C-2 ANCHOR PULLOUT TESTS -- UNIVERSITY OF FLORIDA Test apparatus This section describes the test apparatus used for the short-term and sustained load (creep) tests.
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C-3 baseplate was placed on top of the concrete surface underneath each linear-pot plunger to raise the initial bearing point of the plunger and to provide a smooth measuring surface. Figure 1: Short-term confined test apparatus.
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C-4 Figure 2: Test series 16 short-term unconfined test apparatus. Standard Sustained Load (Creep)
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C-5 between 16 kips and 21 kips the large and small springs were used in parallel with an average combined spring stiffness of 13.4 kips/in. The 5/8" diameter anchor was connected to the 1" diameter loading rod by means of the same non-rigid coupler as in the static load test apparatus.
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C-6 Figure 4: Test frame with hydraulic jack chair. To prevent the test apparatus from falling over due to the dynamic load on the frame caused by an anchor pullout, the test frames were secured to the concrete blocks with loading straps.
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C-7 Figure 5: Test series 16 sustained load (creep) unconfined test apparatus.
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C-8 produced in each series are listed in Table 1. In order to provide a smooth testing surface, the blocks were cast upside down against the high density overlay plywood.
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C-9 The concrete for mixes A–I were batched, mixed, and placed at the Florida Department of Transportation (FDOT) State Materials office in Gainesville, FL.
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C-10 cylinders were capped with plastic lids. After 6 days the forms were removed and the cylinders demolded.
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C-11 Table 2: Concrete series average compressive strength. Concrete Series Pour Date Average Compressive Strength (psi)
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C-12 loading rod (See Figure 1–Figure 5)
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C-13 Load. The Houston Scientific Model 3500 100-kip load cell was calibrated in July 2010 at the Florida Department of Transportation State Materials Office in Gainesville, FL on a Test Mark Model CM-5000-DG compression machine.
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C-14 140°F) and a relative humidity range of 10% to 95%.
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C-15 Figure 14: Layout of anchor pullout test frames in the stability chamber. Data management and acquisition During the testing and conditioning of the test slabs to the elevated temperature, a Microsoft compatible computer ran several National Instruments LabVIEW 8.6 software programs developed to collect, record, and display the data.
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C-16 Due to minor fluctuations in the 10 volt power supply, the LabVIEW programs recorded the power supply voltage with each data reading and the position readings were appropriately adjusted to a normalized ten volt power supply. Data Sampling Program A LabVIEW 8.6 program (Figure 15)
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C-17 hand pump against an ideal load rate to cause bond failure of the expected load in 120 seconds on a load versus time graph. This real-time plot was used to assist the pump operator in applying a constant load rate.
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C-18 Figure 17: Short-term test LabVIEW program (chart page)
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C-19 Figure 18: Sustained load test LabVIEW program (main screen)
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C-20 Figure 20: Sustained load test LabVIEW program (percent load plot)
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C-21 Standard Baseline Installation Procedure All anchors were installed according to the manufacturer's specifications. The holes were created with a 3/4" (11/16" for adhesive A)
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C-22 Table 3: Full hole cleaning procedures per MPII. Adhesive A Adhesive B Adhesive C Blow with compressed air (4x)
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C-23 Figure 22: Vacuum adaptor. Figure 23: Embedment depth chair.
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C-24 Test Series 9 (Reduced Hole Cleaning) Installation Procedure ACI 355.4 section 7.5 defines a reduced hole cleaning effort as 50% of the full hole cleaning procedure.
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C-25 Figure 25: Core drill for test series 13. Tape was placed on the core drill to indicate the proper depth during drilling.
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C-26 Figure 26: Water collector. Figure 27: Extraction tool.
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C-27 0.500" range (this was done because the position readings at the far extremes of the instrument are less accurate)
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C-28 universal testing machine. Once the desired load was obtained, the four corner bolts on the test frame were hand tightened to maintain the load.
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C-29 Test Series 16 (Unconfined) Test Procedure The above procedure was followed with the following exceptions: The PTFE confining sheet and 5/8" thick steel confining plate were eliminated.
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