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Measuring 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
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