Long-Term Performance of Epoxy Adhesive Anchor Systems (2013) / Chapter Skim
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F-1 A P P E N D I X F Early-Age Concrete Evaluation -- University of Stuttgart
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F-2 EARLY-AGE CONCRETE EVALUATION -- UNIVERSITY OF STUTTGART This section presents the test program conducted at the IWB laboratory of the University of Stuttgart to investigate the effect of early-age concrete on the short-term performance of three adhesive anchor systems. Test Apparatus This section describes the test apparatus used for early-age concrete evaluation used at the IWB laboratory of the University of Stuttgart.
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F-3 Figure 1: Short-term testing apparatus. Figure 2: LVDT rig.
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F-4 Rebound Hammer A rebound hammer by Suspa DSI GmbH (Figure 4) was used to measure the concrete hardness.
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F-5 All the test blocks were cast on July 8, 2011 at the Friedrich Rau GmbH & Co precast concrete plant in Ebhausen, Germany. In order to provide a smooth testing surface the blocks were cast upside down against the high density overlay plywood.
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F-6 Figure 6: MPA universal testing machine. Figure 7: MPA cylinder grinding machine.
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F-7 (days) Cylinders (psi)
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F-8 Load. The tension in the anchor was measured indirectly as a compressive reaction of the hydraulic ram in the test apparatus.
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F-9 Figure 9: Sensiron sensor assembly. Figure 10: PVC pipes and Sensiron sensors placed in forms prior to casting.
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F-10 Figure 11: Screenshot of NI Diadem 10.2 data acquisition program. Installation procedure The installation procedure generally followed the procedure described in the section "Anchor Pullout Tests -- University of Stuttgart" except the anchors were allowed to cure for 24 hours prior to testing.
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F-11 The Lukas Hydraulik GmbH 22-kip hydraulic ram was placed on the tripod and connected to the test cabinet hydraulic pump. The loading rod was then connected to the coupler.
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F-12 diameter of the chipped area was measured in four directions (Figure 13) and their results averaged to determine an equivalent circular area.
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F-13 • I1 = initial surface absorption of the top formed surface [ml/m2·s] , • V1 = volume of water measured in the capillary [ml]
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F-14 Figure 14: A2 sub-areas. It is reasonable that the initial surface absorption of the surfaces of the drilled hole (AH)
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F-15 Solving for VS, Eqn. 8 It is obvious that the total volume of water (V2)
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F-16 Eqn. 14 Rebound Hammer Test Procedure Concrete hardness was measured with a rebound hammer in general accordance with ASTM C805 using a Suspa DSI GmbH Original Schmidt hammer.
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