A treatise on highway construction . The shape given to the block has been very varied;rouna, square, rectangular, oblique, hexagonal, octagonal, and manycomplicated forms and interlocking devices have been tried. Butexperience has demonstrated that with a solid foundation there isno reason for complicated shapes or interlocking contrivances; andwood pavements in their modern form consist of either rectangularor cylindrical blocks set with the fibre of the wood vertical, with thejoints between the blocks as narrow as possible and filled with awater-proof cement. The rectangular blocks are prep
A treatise on highway construction . The shape given to the block has been very varied;rouna, square, rectangular, oblique, hexagonal, octagonal, and manycomplicated forms and interlocking devices have been tried. Butexperience has demonstrated that with a solid foundation there isno reason for complicated shapes or interlocking contrivances; andwood pavements in their modern form consist of either rectangularor cylindrical blocks set with the fibre of the wood vertical, with thejoints between the blocks as narrow as possible and filled with awater-proof cement. The rectangular blocks are prepared by cutting with circularsaws blocks of the required depth from planks 3 inches thick by 9or 12 inches wide. The cylindrical blocks are prepared by sawing from round logspieces of the required length, usually 6 inches. These 6-inch piecesare passed through cylinders furnished with steel knives that removethe bark and sap-wood, and leave the blocks perfectly round andfree from all unevenness. The blocks so prepared are known as. Fig. 1 3a. Pavement of Round Blocks. sapless cedar blocks. Figs. 12 and 13 show the manner of con-structing wood pavements as practised in Europe. Fig. 13a showsa typical pavement of round blocks as laid in the United States. 183. Number of Wood Blocks per Square Yard.—The number ofrectangular blocks 9 inches long by 3 inches wide required per squareyard is 44, and the area occupied by the joints will be equal to 108square inches. 162 HIGHWAY CONSTEUCTIOlir. The number of round blocks 6 inches in diameter required persquare yard is JO, and the area occupied by interspaces will be inches. 184. The essentials necessary to the successful const]Tiction ofwood pavements may be summed up as foUows: (1) An unyielding and impervious foundation (concrete). (2) Sound and seasoned wood, either in its natural state ortreated with a preserving compound. (3) An impervious filling for the joints between the blocks. 185. Foundations.—As with all ot
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