ASTM C360 outlines standard procedures for the determination of concrete consistency using ball penetration test.
Equipment:
1. Ball
penetration apparatus
2. Wood float
Sample:
Freshly mixed
concrete with minimum depth is at least three times the maximum aggregate size,
while not less than 200mm in a pan or wheelbarrow. The distance between the
centreline of handle to the nearest edge shall not be less than 225mm.
Procedure:
1. Smoothen and
level the concrete surface using wood float.
2. Set the base of
the ball penetration apparatus on the surface with handle in vertical position.
3. Lower the
weight to the surface of concrete and release slowly.
4. Measure the
penetration depth after the weight has come to rest. Round the measurement to
nearest 5mm and record it as penetration value (mm).
5. It is advisable
to take minimum three readings and take the average. If the difference between
the maximum and minimum readings exceed 25mm, take more measurement until such
difference for three consecutive readings is within 25mm.
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