Public works . o this pavement. The following synopsis of thebulletin gives only the general statements and summaries. Thesixty pages of the bulletin give details, illustrations, tabulated dataand other matter, which will repay study by those specially investigation was made by Roy M. Green, associate professorof highway engineering, under the direction of J. C. Nagle, directorof the experiment station. There is probably no type of pavement which is sogreatly influenced by local conditions as that of bitumin-ous construction, since the success or failure of the workdepends not o
Public works . o this pavement. The following synopsis of thebulletin gives only the general statements and summaries. Thesixty pages of the bulletin give details, illustrations, tabulated dataand other matter, which will repay study by those specially investigation was made by Roy M. Green, associate professorof highway engineering, under the direction of J. C. Nagle, directorof the experiment station. There is probably no type of pavement which is sogreatly influenced by local conditions as that of bitumin-ous construction, since the success or failure of the workdepends not only upon the traffic and climatic conditions,but upon every peculiarity of the materials that may beused. Since more than ninety per cent of the materialsforming the pavement are from local sources, it wouldseem self-evident that each locality has a pavement prob-lem which must be studied and solved more or less inde-pendently of what may be done elsewhere. In order that the information might be truly represen-. MINERAL AGGREGATE PLOTTED ON THE IDEAL BITULITHICGRADING. 324 MUNICIPAL JOURNAL AND PUBLIC WORKS XLVU, No. 22 wear is thereby reduced and also because the absorptionof water by the aggregate is decreased. Grading of Mineral Aggregate.—In addition to beingtough and hard, the large aggregate must be graded insize so as to give the maximum density, as this will alsogive the gieatest stability to the mixture. This more orless stable mixture of large aggregate should be embed-ded in a bituminous mortar of such proportions that itwill reinforce the large aggregate, prevent internal wearas much as possible, and at the same time produce a wa-terproof mixture. The proportions of such a mortar arethe same as that for the standard sheet asphalt mixturelor heavy traffic, as such a mixture is sufficiently rigid towithstand the distorting action of traffic and at the sametime furnishes a waterproof surface. The ideal bitulithic grading would then be one com-posed of a large a
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
