The line hitting rebound test method for nondestructive test of concrete compressive strength

摘要

PURPOSE: A line striking rebound test method is provided to increase compression force and striking force by improving configuration of impact plunger and compression spring. CONSTITUTION: A line striking rebound test method, comprises a first step of arranging a rebound test machine to be perpendicular to a concrete surface(2) by allowing an impact plunger(1) to tightly contact the concrete surface; a second step of allowing a compression spring(5) to push a hammer(9) by compressing the rebound test machine, and the compression spring being supported by a stopper(8) to transmit motion energy to the hammer when the stopper is released; a third step of allowing the hammer to strongly strike the impact plunger by the force of the compression spring; a fourth step of permitting the impact plunger to transmit impact force to the concrete; a fifth step of permitting rebound force of concrete to be transmitted to the impact plunger and to an impact spring(10); a sixth step of pushing the hammer upward by the action of the impact spring, and permitting the hammer to move an indicator of a guide rod(4); and a seventh step of fixing the indicator by pressing a push button(6), reading data of a scale plate(11) and recording the read data.