Measuring Thickness of Concret
Measuring Thickness of ConcretMeasuring Thickness of Concrete
Measuring Thickness of Concrete Elements Using Drilled Concrete Cores
When doing construction one of the major concerns is that the work
being done complies with the design specifications. In this ASTM
test, C 174M-97, the thickness of a concrete pavement, slab, or
structural element is determined by measuring the length of a core
drilled from a concrete structure. This allows the contractor,
as well as the owner, to see that the concrete is being poured to
meet the requirements. (ASTM, C 174M-97, 1)
In order to complete this experiment a particular tool will
be needed. It is a 3-point calipering device that will measure
the length of axial elements of the core. This apparatus must
conform to certain requirements. It needs to be designed so
that the specimens will be held with its axis in a vertical
position by three symmetrically placed studs or posts of
hardened steel bearing against the lower end. The end of the
studs that bear against the surface of the specimen need to be
rounded to a radius of not less than 6 mm and not more than
13 mm. The apparatus needs to allow for the measuring of
specimens of different nominal lengths over a range of at
least 100 to 250 mm. It needs to be made in order to make
a measurement at the center of the upper end of the specimen
and at eight additional points spaced at equal intervals
along the circumference of a circle. The device that makes
contact with the end surface of the specimen needs to be
rounded to a radius of 3 mm. Finally the instrument for
measuring needs to be stable and sufficiently rigid to
maintain its shape and alignment without a distortion or
deflection of more than 0.25 mm during all normal measuring
operations. Before any measurements are made, though, the
apparatus needs to be calibrated with suitable gages so
that errors caused by mechanical imperfections in the
apparatus are known. (ASTM, C 174M-97, 1)
The measuring apparatus is not the only thing that needs...
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