Hammer Testing Mean?
Hammer testing is a method of impact testing designed to test the resistance to penetration of various rock, mineral or concrete materials as described by the American Society for Testing and Materials International in Standard ASTM D5873. It uses a bottom of hole assembly, called a hammer, to conduct a rebound hardness test on rock.
Trenchlesspedia Explains Hammer Testing
Hammer testing rock and other materials for hardness is part of the initial preparations completed in underground engineering prior to final planning and design activities. It’s necessary to know hardness to be sure that boring or drilling can penetrate hard rock in order to know what methods are appropriate for drilling, augering or moling through the rock barrier. In some circumstances, such as where the rock barrier is too substantial for horizontal directional drilling, a new design pathway must be chosen.