This test specifies a procedure for tensile testing anchor bolts made of carbon steel including carbon boron and carbon magnesium high-strength alloys. There are 3 grades depending on the tensile strength of the steel: 36, 55, and 105 KSI. This specification covers all threaded rods and bars that are used in the anchoring of concrete. A concrete slab which supports a highway sign or a traffic light is a good example of an application for these types of structural anchor bolts.
The bolts can be either straight or bent and the ends of the bolts can be either headed or headless. There are several different sizes of bolts that are tested based on the diameter.
A Universal Testing Machine is used in combination with bolt grips in order to perform the tensile test. Mounting the rods is relatively easy especiall if the rod is threaded or headed such as with a Hex head. This test is usually used more as a quality acceptance test instead of in an R&D environment. For this reason an extensometer is usually not needed.
The test results include ultimate tensile strength, yield strength, and elongation. All of these parameters are easily measured with a Galdabini material testing system.
ASTM A370 - Test Methods for Steel Products
ASTM A307 - Tensile Testing on carbon Steel Bolts and threaded Rod