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Petrographic examination of concrete aggregate was included in the three previous editions of ASTM Technical Publication, ASTM STP 169, ASTM STP 169A, and ASTM STP 169B, under the present authorship. The construction and content of this chapter is like that of the former presentations except that a substantial addition treats petrographic examination of recycled concrete for use as aggregate in new construction. The properties of recycled concrete are covered in some detail so as to aid the petrographer in decision on investigation of constructions to be demolished with intent to produce concrete for recycling and on observations that should be made as a part of the examination of the finished aggregate. Experience and literature pertinent to examination of all types of concrete aggregate are cited as appropriate.
President, Richard C. Mielenz, P. E., Inc., Gates Mills, OH