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Excerpt from The Cementing Power of Road Materials For several years the road material laboratory, now included in the Division of Tests, has been desirous of impressing upon engineers and others interested in road building the importance of that property of road materials known as cementing power and its relation to the selection of the best materials. Everyone who has given careful attention to this subject is aware that different rocks vary widely in their binding power. While some broken stones will easily and rap idly consolidate under the roller or traffic, others. Will do so only slowly and with difficulty, while again some totally lack any binding power whatever. Furthermore, as pointed out in previous publica tions from this laboratory, the species of the rock is practically no guide as to its road-making quality, and a study of Table III (p. 17) clearly shows this to be true in regard to cementing value. This -cementing power is caused by a hydrated condition of the particles, which is the result of certain secondary changes produced in the min erals composing the rock structure. Whether these changes take place depends upon circumstances, and not, broadly speaking, upon the rock species. This subject, however, will. Be more fully discussed later on. 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.

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