Arizona republican., 1915-12-07

, little sign of wear or deterioration. The pavement south of the city hall 1 is an exceptionally good example of concrete pavement with a rough ce- ment surface, but it was laid under
 unnecessarily expensive specified tions, and it's cost was excessive, $2.47 per square yard.
 A large mileage of concrete pave ments has been in use in Wayne County, NIfch., surrouqding the city of Detroit. for many years. The au- thorities of Wayne county have shown their confidence in this type of pavement by it's continued use. Engineers who have examined these roads, commend them highly, and our local committee who about two years since visited Wayne county for the purpose of making an investigation, reported very favOrably as to the value of these roads for a permanent pavement
 We have reports from twenty five Michigan cities where over 365,QO0 wards of concrete pavement were laid in 1914. Cost figures ate not avail able in all cities, but ir ten of the lGdUllS CILl6S- W Iltl . d LOltil OL co 6O1 yards were laid. the average cost was $1.42 per square yard, the average thickness being inches.
 During the past few years many other cities and communities have commenced the construction of con- crete highways. The county of Mil waukee, Wis, the county seat of which is Milwaukee, has now nearly one hundred miles of concrete pave ment The following letter from MT. J. H. Kuelling. their highway com missioner. is a convincing evidence of the value of concrete highways. The cost of these roads during the year 1914 varied from $1.10 to $1.45 per square yard This included consider able reinforcement and also the eX- pense of expansion joints
 Milwaukee, Wis, Nov. IS, 1915.
 MT. Dwight B. Heard,
 Phoenix, Arizona.
 Dear Sir:
 Yorr letter of Nov. l., addressed to
 the City Engineer, Milwaukee, Wis, has been referred to me.
 Milwaukee County at the present time has about S7 miles of concrete pavement as we are very well satis- fled with the same. This is evidenced by the fact that next year we expect to build about g miles. We are en-
 closing a copy of specifications which are used in all parts of Wisconsin. am also sending you a copy of our annual report which will give you some idea of the prices.
 Yours very truly.
 (Signed1 H. J. KUELJINCf, County Highway Commissioner.
 As is well known, the California Highway Commission. has, during the
 past few years. constructed nearly one thousand miles of concrete high ways. and their satisfaction with this class of pavement in use is snown by their continued use of 9 similar type of pavement In California the con- crete pavement is finished with a bituminous wearing surface of from one-half to three -eighths inch thick The following extracts from a letter cf Nov. 26th of MT. A. B. Fletcher, the highway engineer of California, contain interesting information as to
 this type of pavement:
 Frost action is practically neg igfble factor in California so far as the IOuNS are CflilCEi ilGt uiiAii ciAi IlN- vation nearly a mile above the sea | is reached.
 NO rigid standard of pavement was adopted hy those in charge of the state highway work and an attempt l has beer made to have the pavement l fit the traffic needs both as to width and type
 After nearly three years experience with the thin bituminous Surface, tho Iseverest critics must admit it's sue cess under California conditions. Ii
 does not peel off when properly ap- piled it will last usually not less thar l four years with but small expense
 for minor repairs, and it can be ap- piled originally for from : to 10 cents ! per square yard and renewed wher worn so as to require renewal fol
 less than |. cent per square foot.
 Tn California we have not found | 1t necessary to apply a thick wearing surface to the concrete roadways un- | til the traffic is considerably in eX- cess of 500 vehicles per day ant 1 then chiefly because of the lack of 2 state law limiting the weight carried per inch of tire If the vehicles were lall rubber tired I would not fear any liH effect from 1000 vehicles day.
 "The thin asphaltic surface in Cali
 fornia has cost, when put on origin
 ally, from to 10 cents per square yard or using the higher figure
 $SS000 per mile of pavement fifteel feet wide Experience has shown tha lthis coating will last on the avera gt lat least three years with only nom inal eXDenGitIireS for patching ant that further coating of half tn,
 original thickness will undoubtedly re