The test measures the force required to pull out a previously cast in steel insert with an embedded enlarged end in the concrete. In this operation, a cone of concrete is pulled out and the force required is related to the compressive strength of concrete.
Principle
This test is based on the principle that the force required to pull out a cone of steel embedded in concrete is proportional to the strength of concrete.
This test is based on the principle that the force required to pull out a cone of steel embedded in concrete is proportional to the strength of concrete.
Test Procedure
Pull out insert (shown in fig) is embedded in plain concrete during pouring. When the strength is required to be determined, the force is applied at the embedded end. The force required to pull out the assembly is measured.