Street Pavement Laid in the City of Chicago An Inquiry Into Paving Materials M
Street Pavement Laid in the City of Chicago An Inquiry Into Paving Materials M
Ill Chicago Bureau of Public Efficiency Chicago
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The very broad experience which has been had in the city of Indianapolis with the different varieties of pine indicates that, while not all the failures of wood block pavement there have been due to the use of loblolly, practically all of the loblolly blocks have failed. Street Pavement 29 The Chicago specifications require that the annual rings shall be not less than six to the inch, and the railroads of the country generally require not less than eight. The specifications adopted at the New Y...ork convention in 1911, therefore, are de- cidedly inferior in this respect. Density of the wood is an important factor in the bearing it has on the quantity of preservative the block will receive. Greater density ordinarily renders the block more durable, though ex- perience has shown that some of the softer pines, such as Norway, hold up quite well under traffic. Tests conducted by the United States Forestry Department since 1906, on Nicollet Avenue, in Minneapolis, indicate the values of the various woods for creo- soted pavements in the following order: (1) Long-leaf pine.
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