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This Symposium on Mineral Aggregates is devoted to presentation and discussion of a group of papers dealing with the distribution, characteristics, and uses of mineral aggregates. The papers in this symposium are written primarily for that group of individuals interested in the characteristics and uses of mineral aggregates who normally are not intimately connected with the aspects of research and testing. For purposes of the symposium, mineral aggregate may be defined as “Mineral Aggregate—An aggregation of sand, gravel, crushed stone, slag, or other material of mineral composition, used in combination with a binding medium to form bituminous and portland-cement concrete, macadam, mastic, mortar, plaster, etc., or alone as in railroad ballast, filter beds and various manufacturing processes, such as fluxing, etc.” It is to be noted that the concept embodied in the use of the term “aggregate” as presented in this definition is much more inclusive than that of either of the present A.S.T.M. definitions. The enormous demand during and following the recent World War for mineral aggregates as a material of construction has focused attention on the need for complete and up-to-date general knowledge of the characteristics of these materials. In 1929 a committee, advisory to the Society's Committee on Papers and Publications, under the chairmanship of Mr. R. W. Crum, developed a Symposium on Mineral Aggregates. The supply of copies of the Symposium has been exhausted for several years. In addition, the Administrative Committee on Papers and Publications of the Society has felt that in view of the time that has elapsed since the presentation of the original Symposium on Mineral Aggregates, a new one would appear to be in order. Accordingly, in 1941 a small committee was appointed to develop this symposium. The recent World War interrupted the program and it was not until 1946 that a new committee was formed consisting of the following personnel: B. A. Anderton, E. W. Bauman, R. F. Blanks, Shreve Clark, R. W. Crum, Roy Gilbert (Secretary ex-officio), A. T. Goldbeck, Fred Hubbard, D. E. Parsons, Stanton Walker, and K. B. Woods (Chairman). The committee has met four times for the purpose of developing subject content. Although the papers represent the individual views of the authors, an important task of the committee has been that of reviewing the many papers included in the symposium. Even though the scope of this symposium is enlarged considerably over that presented in 1929, there are many subjects which have been touched upon only lightly. In contrast, many of the papers contain extensive bibliographies. Historical background has been presented where it is indicated that this phase of the subject is important in evaluating current practices. The papers may be grouped into six general categories including: (1) Distribution, Processing, and Sampling; (2) Tests and Mineralogical Characteristics; (3) Aggregates for Portland-Cement Concrete; (4) Aggregates for Bituminous Construction; (5) Aggregates for Miscellaneous Use; and (6) Needed Research.
Woods, K. B.
Professor of Highway Engineering and Associate Director, Purdue University, Lafayette, Ind.