TM-39, Pull-Out Tests on Expansive Mortars

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This test method determines the total load in pounds required to cause failure of expansive mortars used for grout.


Concrete cylinders are prepared using Burlington Limestone aggregate, moist cured ten days and drilled with a 2 in. diamond bit to a depth of 9 in. After moist curing for another thirty days, Number 5, grade 60, deformed reinforcing bars complying with AASHTO M31, 2 ft. long are grouted into place in the prepared concrete cylinders. After curing at 75°F ± 7°F at a relative humidity. of not less than 50% for seven days the reinforcing rods are pulled from the concrete cylinders at a rate of 0.5 in. per minute. Record the total load in pounds required to cause failure of the system, where the failure occurred and the condition of the bond between mortar and concrete.