. Water & sewage works . neces-sary, however, to watch the grading ofthe sand content of the gravel to see thatthere is a sufficient proportion of the finerparticles, that is, those below 1/10 usually gravel sand contains an ex-cess of finer particles, there has been en-countered occasionally a gravel thatlacked a sufficient amount of the smallergrains to make a good mortar. The use of practically all gravels com-posed of satisfactory material is usuallypossible under the aljove provisions. Theresulting proportions stated in the usualform may vary for a certain class of con-crete, fro
. Water & sewage works . neces-sary, however, to watch the grading ofthe sand content of the gravel to see thatthere is a sufficient proportion of the finerparticles, that is, those below 1/10 usually gravel sand contains an ex-cess of finer particles, there has been en-countered occasionally a gravel thatlacked a sufficient amount of the smallergrains to make a good mortar. The use of practically all gravels com-posed of satisfactory material is usuallypossible under the aljove provisions. Theresulting proportions stated in the usualform may vary for a certain class of con-crete, from 1 part cement to 2% partssand and 4 parts stone to a mortar mix-ture of 1 part cement to 2% parts sand. This method of proportioning is basedon the assumption that if the sand andstone are of satisfactory quality, and theratio of sand to stone is equal to, or great- November, 191S MUNICIPAL ENGINEERING 51 SOUTHERN YELLOW PINE THE BEST WOOD FOR CREOSOTED PAYING BLOCKS OWING TO ITS EXTRAORDINARY PHYSICAL Close Annular Rings, Dense, Hard, Strong and Durable. Mr. H. W. Durham, Chief Engineer in Charge of Highways, Borough of Manhattan,City of New York, states: Our specifications provide that the wood to be used shall beSouthern Long Leaf Yellow Pine. * * * That the popularityof Creosoted Wood Blocks as a paving material is illustrated byits present use—820,000 square yards having been awarded in theCity of New York during 1912. * * » Very little trouble andfew repairs has resulted when the material has been Yellow Pine,and the absorption test has been maintained. The facts are. Southern Yellow Pine has made Creosoted Blocksa popular paving material, owing to its great strength under endcompression, dense, hard texture, and uniform straight resin this wood contains is a preservation in itself, so that YellowPine blocks, when properly creosoted, will insure absolute paving sat-isfaction for years in the most trying, congested traffic districts of ourl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsewerage, bookyear191
