PURPOSE:To confirm the penetration quantity of a tip penetrative part and to decide the strength by providing a mark protruded like a concentric circle on the hemispherical tip penetrative part. CONSTITUTION:On the outside peripheral surface of a cylindrical body 1 of a penetration testing device A, a load scale 2 is graduated, a shaft 5 with a handle 4 is fitted and inserted into a top cover 3, and a spring 8 is installed between a spring receiving piece 6 fixed to the lower end part of the shaft 5 and a bottom cover 7. Also, a connecting material 10 is screwed to the bottom cover 7 and a hemispherical tip penetrative part 9, and on the penetrative part 9, a protruded mark 13 is provided like a concentric circle. In such a state, by pressing the device A vertically against the surface the surface of young age concrete B, and pressing the handle 4, a hollow C is formed on the surface of the concrete B. In that case, by viewing a mark 12 put to the spring 8 through a slit 11, a load loaded by the device A is known. Also, the penetration quantity of the penetrative part 9 is confirmed by checking the number of concentric circles of a trace of the mark 13 left in the hollow C, and from a relation of the penetration quantity and compressive strength, the compressive strength of the concrete B can be decided.
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