Identifier: cityroadspavemen00juds (find matches)
Title: City roads and pavements suited to cities of moderate size.
Year: 1902 (1900s)
Authors: Judson, William Pierson, 1849-1925
Subjects: Streets Pavements Roads
Publisher: New York : The Engineering news publishing company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ving bricks and blocks. Streets of Philadelphia, equal to over sixty mileslength of thirty feet width, have been paved with theseblocks, and it is stated by Wm. H. Brooks, chief ofbureau of highways of Philadelphia, that some streetsthus paved for over ten years have required no repairsand are now in good condition. CHARACTERISTICS. The material for moulding any paving brick must beof a peculiar character which will not melt and flowwhen exposed to an intense heat for a number of days,but will gradually fuse and form vitreous combinationsthroughout, while still retaining its form. The resulting brick must be a uniform block ofdense texture, in w^iich the original stratification andgranulation of the clay has been wholly lost by fusionwhich has stopped just short of melting the clay andforming glass. The clay while fusing must shrink equally through-out, thus causing the brick to be without any lamina-tions or any exterior vitrified crust difTering from the 87 CITY ROADS AND PAVEMENTS.
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S8 ABRASION AND IMPACT TKST. interior. Such a brick will be incapable of absorbingany considerable amount of water, and will hence beunaffected by frost, and if formed of the best materialproperly treated will be tough, to withstand the blowsof horses toe-calks; hard to resist the abrasion ofwheels, and strong to carry heavy loads: these beingin the order of effectiveness of the destructive forces tobe met. There is now little difficulty, with rigid inspection,of getting brick which will uniformly possess thesequalities. QUALITIES OF PAVING BRICK. If the brick are uniform in character and are per-fectly formed of proper material which is thoroughlyfuzed, they will be harder than glass and nearly as hardas quartz (being 6.5 on Mohs scale), and will be toughenough to endure traffic. These qualities will be bestdetermined by the followang described test: ABRASION AND IMPACT TEST. The standard test revised and adopted by the Na-tional Brick Manufacturers Association in 1900, pro-vides for

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