. Water & sewage works . eet wideand 2,400 feet long, built in 1911, is onecourse of 1:1%: 3 screened sand andpebble concrete and cost $ a squareyard. The surface is good and only 13slabs had cracks, all transverse, whichhave been repaired. There is consider-able heavy hauling and the road is ingood condition. The section, about 1,000feet long, built in 1912, is in good con-dition and a fine piece of road. Mr. Greens report includes also obser-vations upon streets in Highland Parkvillage adjacent to Detroit, and Windsor,Ont., which are far less satisfactory. A comparison of the conclusions
. Water & sewage works . eet wideand 2,400 feet long, built in 1911, is onecourse of 1:1%: 3 screened sand andpebble concrete and cost $ a squareyard. The surface is good and only 13slabs had cracks, all transverse, whichhave been repaired. There is consider-able heavy hauling and the road is ingood condition. The section, about 1,000feet long, built in 1912, is in good con-dition and a fine piece of road. Mr. Greens report includes also obser-vations upon streets in Highland Parkvillage adjacent to Detroit, and Windsor,Ont., which are far less satisfactory. A comparison of the conclusions drawnby the two engineers will be interestingin view of the general agreement uponthe facts in the case, Mr. Rogers reportof facts being more severe upon theroads, if anything, than is Mr. Greens. Mr. Rogers notes that the longitudinalcracks almost invariably appear on fillsand in cuts and in groups, indicatingthat local conditions cause them. Heattributes them largely to settlement in November. CONCRETE ROADS 413. fills and to water and frost in the sub-grade in cuts, and shows conflicting evi-dence on the proposition that a widthgreater than 12 feet invites cracks unlessthe pavement is thickened to correspond,the preponderance on Wayne Countyroads being against the claim. Holesare attributed to foreign matters in theconcrete and inferior stone. He consid-ers the pitted condition of the roads tobe the most serious defect and to requirethe most constant attention for mainten-ance. These defects are due to defectivematerials and methods in building roadsand not to the concrete principle itself,and he therefore considers that WayneCounty has made no mistake in choosingconcrete as a paving material for itsmain roads. It may be added that the better con-dition of the roads of later constructionseems, up to this time, to be due quiteas much to better materials and methodsas to shorter time of subjection to wearand elements. Mr. Green agrees very well with regarding
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsewerage, bookyear191
