Concrete shear strength measurement method and measuring device

Abstract

Abstract PURPOSE:To measure the concrete shearing strength by applying tensile force to a rod body which is fixed by an adhesive resin into a hole pierced on the surface of concrete, and detecting a braking source of a nuclear crack by a sound scope which is installed on the rod body or the surface of concrete. CONSTITUTION:A steel rod 4 provided vertically by an adhesive resin in concrete is held by a tensile shaft 6, and drawn up by rotating a handle 12. Tensile force is sent to a data box 18 at any time by a pressure gauge 16, and when it reaches prescribed tensile force, a shear phenomenon of concrete is generated between the adhesive resin 3 and the side wall face of a prepared hole 2 in concrete. Simultaneously, a 'nuclear crack' 21 appears in a part of depth lc of about 1.8 times of the diameter of the prepared hole, and a 'breaking sound' is generated. The generated sound is detected by a sound scope 17, and immediately transferred to the data box 18. In the data box 18, the generated sound is used as a trigger and a numerical value which has converted the tensile force to shear strength from the pressure gauge is displayed on a digital display board 19.

Inventors

• 👤 Minoru Sawaide
• 👤 稔 沢出
• 👤 Noboru Hiraoka
• 👤 平岡　登

Bibliographic Details