ADA INSTRUMENTS Schmidt Hammer 225, Руководство по эксплуатации

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Schmidt Hammer 225
MEASUREMENT FOUNDATION
2
Rebound values.
As we all know, using rebound hammer inspecting strength of concrete components is actually detected the surface
hardness of concrete and use a special deinition of rebound values to describe and characterization of concrete
hardness,
obtained the correlation curve and mathematical model between rebound values and concrete components strength by
testing methods.
Deinition of rebound values.
The deinition of rebound values by the following formula:
L'
L
R—Rebound values
L—Strike tension spring standard stretching length, mm(75mm)
L’—Rebound distance at irst after strike hammer and rod are impacted
2.10 Graduated Scale of rebound value.
According to Test Hammer working principle and deinition, design a special scale —rebound value graduated scale. This
ruler’s scale line distribution and arrangement is as follows: Rebound value full scale for 100, from 10 to 100 degrees as
45 grid, each grid for the two rebound values, numbers scale line : 10-20-20... ...100, the actual length of 67.5mm, from
the zero line to 100 scale lines, a length of 70mm.
R = X100%