TM-74, Pullout Tests on Epoxy Bonding Agents for Resin Anchor Systems

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This test method determines the total load in pounds required to cause failure of epoxy bonding agents for resin anchor systems for use in anchoring products such as threaded rod, and uncoated and epoxy coated reinforcing bars in concrete. Concrete Cylinders and Anchored Products Requirements Concrete Cylinders

Two concrete cylinders, 6 in. x 12 in. for each bonding agent and style of anchoring product shall be prepared using a limestone coarse aggregate and moist cured for at least 28 days. Representative cylinders shall be tested and must obtain a minimum compressive strength of 6,000 psi. Reinforcing Bars

Reinforcing bars shall be Grade 60 in accordance with Sec 706 and Sec 710. A #5 bar, 24 in. long shall be used for testing. Threaded Rods

Threaded rods shall be Grade 8. Procedure Drilled Holes

The holes drilled in the concrete cylinders shall be 1/8 in. larger than the diameter of the bar or rod and drilled 5 in. deep. For bars or rods other than a #5 bar, the hole shall be drilled to the depth specified by the manufacturer but not less than 5 inches. The holes shall be clean and blown dry prior to placing the bonding agent. Bonding Agent

The placing of the bonding agent shall begin with positioning the cylinder with the hole in a horizontal position. If bulk material is furnished without a mixing tube, the bonding agent may be placed in the hole with the cylinder in a vertical position. The cylinder shall then immediately be placed in a horizontal position and the anchored product inserted.

Enough bonding agent shall be placed in the hole to completely fill the cavity when the anchored product is inserted. The anchored product shall be inserted with a twisting motion sufficient for one full revolution. The cylinder shall remain in the horizontal position until curing is complete. All mixing and placing of the bonding agent shall be in accordance with the manufacturer’s recommendations. Performing Concrete Cylinder Test

The test shall be performed when the bonding agent has cured for 24 hours. The anchored product shall then be pulled from the concrete cylinder at the rate of 0.5 in. per minute. Additional Tests

The bonding agent shall be tested for pullout load in accordance to ASTM E488 by the manufacturer. The pullout tension loads shall meet the minimum values specified in Sec 1039.40. The minimum embedment depth for each anchor size shall be determined for each bonding agent. Report

The report shall indicate for each test specimen, the type and size of the anchored product, the diameter of the hole, the ultimate load in pounds required to cause failure of the system, the average of the two test specimen loads, a description of the failure for each specimen and the cure time when tested. When tested in accordance to ASTM E488, the recommended embedment depth shall be noted for each anchor size to achieve the minimum specified load.