A treatise on highway construction . laws in the samples and variations in The resistance to crushing of the various materials is given inTables VI, VII, VIII, XIV, XXI, XXIa, XXII, and XXIV. 87u. Petrographic Analysis.—The microscopic examination re-veals very clearly the nature cf the component minerals, their in-terlocking, decompcsition, and alteration, as well as the presenceof secondary products, which may affect the chemical this investigation a thin chip of the rock is ground with emeryuntil it becomes transparent; it is then mounted upon a micro-
A treatise on highway construction . laws in the samples and variations in The resistance to crushing of the various materials is given inTables VI, VII, VIII, XIV, XXI, XXIa, XXII, and XXIV. 87u. Petrographic Analysis.—The microscopic examination re-veals very clearly the nature cf the component minerals, their in-terlocking, decompcsition, and alteration, as well as the presenceof secondary products, which may affect the chemical this investigation a thin chip of the rock is ground with emeryuntil it becomes transparent; it is then mounted upon a micro-scope-slide and examined. 87v. Chemical Analysis.—The chemical analysis is employedto supplement the petrographic examination as well as to deter-mine qualitatively and quantitatively the constituents. Fromthe chemical analysis conclusions can usually, though not always,be drawn as to the weathering properties. 87w. Cementation Test.—The binding or cementing power ofrock-dust is determined by the method and machines devised by. ELECrmCALATTtCHUENT Fjjil CPENIHBANDCLOSrna THREEWAY CaCK. FIG. E. BRIQUETTE MACHINE. Mr. Logan W. Page, Geologist of the Massachusetts Highway Com-mission. The test is made by wetting the dust obtained from theabrasion test in the Deval machine or purposely preparing it in a. 58 HIGHWAY COIfSTETTCTIOK. ball-mill and forming it into cylindrical briquettes 25 mm. () in diameter and height. The briquettes are moulded in themachine shown in Fig. E by forcing the moist powder into a steeldie under a pressure of 100 kilograms per square cm. ( pounds
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