The Effect Of Preliminary Heat Treatment Upon The Drying Of Clays

Author : A. V. Bleininger
Publisher :
ISBN 13 : 9781331950899
Total Pages : 596 pages
Book Rating : 4.9/5 (58 download)

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Download or read book Technologic Papers of the Bureau of Standards, Vol. 1 written by A. V. Bleininger and published by . This book was released on 2015-07-21 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Technologic Papers of the Bureau of Standards, Vol. 1: The Effect of Preliminary Heating Treatment Upon the Drying of Clays To this class of materials belong the so-called joint and swamp clays of the glacial regions of Ohio, Indiana, Illinois, Wisconsin, Minnesota, North Dakota, and other States and Territories. In order to bring out clearly the various effects of such a preliminary treatment, extensive laboratory experiments have been made on small and large samples of widely differing plastic clays. Preheating, rather than other possible treatments, such as the admixture of sand or sandy clay or the addition of salts like sodium carbonate and sodium silicate, has been chosen, since the mixture with nonplastic materials like sand presupposes the presence of the latter within a reasonable distance, which frequently is not the case; on the other hand, the incorporation of soluble salts even in very small amounts may give rise to the appearance of disagreeable efflorescence on the surface of the ware. Still other means of dealing with this problem, such as the exposure of the dug clay to freezing during the winter or drying out in the summer, are not always practicable nor effective. Furthermore, mechanical drying has become a well-developed feature of many industrial processes, and its cost is in part compensated by the resulting regularity of the manufacturing process, the possibility of eliminating objectionable mineral detritus like gravel, lime pebbles, etc., and other desirable features. 2. General Conditions Of Drying (a) The Plastic State. - The use of clay in the arts depends upon its plasticity, the property of retaining any shape into which it is molded, supplemented by its quality of hardening to a stone-like mass when dried and burnt. The cause of plasticity has been made the subject of elaborate discussions, but as yet no exact explanation has been found for it. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.