“A petrographic examination of concrete ordinarily begins and ends with a problem of communication between the person who requests the examination usually an engineer-and the person who makes it-usually a petrographer. Unless the two succeed in producing a clear, mutually understood statement of the problem, they cannot expect a clear, useful answer to be economically obtained. . . . The petrographer should not expect petrographic results to be taken on faith…. Both should remember that the essentials…
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