File:Repair and maintenance of highways (1913) (14761029136).jpg

Identifier: repairmaintenanc48hewe (find matches)
Title: Repair and maintenance of highways
Year: 1913 (1910s)
Authors: Hewes, Laurence I. (Laurence Ilsley), 1876-1950 United States. Bureau of Public Roads
Subjects: Roads Maintenance and repair Dirt roads Maintenance and repair.
Publisher: Washington : U.S. Dept. of Agriculture, Office of Public Roads : G.P.O.
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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ne, or it may be of sizes andamount adapted for finishing the road at once. On old roads which have been worn very thin, it is good practiceto add first enough stone to rebuild the bottom course, for example,to a minimum of 3 inches in depth when rolled, and then to apply asecond course as in construction. Grades and lines are usuallyneeded on repair work and, where stone is to be spread as a secondcourse, it will be advisable to use spreading blocks of size equal to thedepth of the loose stone. 12 EEPAIE AXD MAINTENANCE OF HIGHWAYS. There are many variations from the above outline of the resur-facing method. When the road presents an even surface and is notmuch worn at the sides, the center or horse track may be thoroughlyscoured with stiff brooms until the bare mosaic surface appears, andNo. 2 stone of the same kind as that used in the construction maybeapplied directly to restore the crown. The application should be ofsufficient depth to create a mechanical bond and must be rolled.
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Fig. 3.—Another type of scarifier. When the wear has been uniform, expense may sometimes be savedand the solidity of the road preserved by confining the scarifier to ashallow strip on the outside edges of the road after first thoroughlysweeping the surface clean of all dust and dirt. If it is possible tosoak the road before applying new stone, it will greatly help in bondingnew material to the old surface. In any case there must be no layeiof dust or refuse on the old road when the new stone is applied; other-wise there will be an imperfect bond and the new layer will break up. MACADAM ROADS. 13 Sometimes the scarifying may be reduced to shallow, hand-pickedgrooves parallel to the road and a foot or more apart, or else it may- beentirety omitted. In the latter case the road should be first patchedto fill up all depressions and the patches rolled. The roadway isthen thoroughly cleared of all dust, dirt, and refuse, and abundantlysoaked, and then the new stone is spread true to crown

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