Company engineers recently investigated published industry standards for shear values of threaded lift pins with socket when embedded in concrete of 3,500 psi or higher compressive strength.
Meadow Burke Gauges Embedded Lift Pins’ Shear Values
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Ultrasonic Device Gauges Concrete Set Time, Optimal Mix Placement Rate
Until now the so-called knead bag test has been used to determine concrete hardening or solidification time, tE. It entails filling a plastic bag with a small amount of mix, testing at different time intervals to measure when the concrete can no longer be pressed by thumb. European practitioners find the method subjective and uncertain, which is why the time determined in accordance with the German DIN 18218 standard must be extended by 25 percent.
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