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e e 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 d ....

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.... 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 ....