Arizona republican., 1915-12-07

store the carpet to it's original thick i ness at the end of the three year period. The annual cost due to re- storing the carpet would then be $SS0X1A to 1-5, or S146.5O per mile of pavement T. feet wide
 The California Highway Commits sion furnishes the cement to the con- i tractors for the highway construc- tion and usually the fine and coarse
 aggregate is also furnished.
 Our highway costs for completed pavements. are greatly influenced by , the character and accessibility of the country over which the highway is built, and by many other factors , which are of but slight importance in city street paving work
 "A cost of 70 cents per square yard would be low for the completed high way with concrete pavement 15 feet wide of minimum thickness of four inches. A cost of S1.O0 per square yard would not be excessively high for the completed 15 foot pavement. .' When MT. Fletcher refers to the low cost of 70 cents per square yard he is undoubtedly figuring on a pave ment without any reinforcement and NltllOltt tAiEtIiSlOll JOlnIS- ne recent inspection made by MT Dwight B. Heard of this paper, shows that on many of the concrete pavements in California expansion joints are not being used Natural cleavage lines are counted on to take care of the contraction and expansion. and these naturally formed joints are filled with tasphaltum. This method has appar- ently proven entirely practical in California.
 We believe that the conditions in | this portion of Arizona are equally as favorable for the construction and low cost of maintenance of concrete highways as they are in California, and it would seem entirely possible to construct a thoroughly first class | concrete pavement in. thick without | expansion joints and with a top wearing surface of bitumin and sand, ! at total cost per square yard of
 not to exceed $1.20 inncluding a fair contractors profit.
 The Iowa Highway Commission is strongly in favor of concrete pave ments. The us of these pavements in Iowa has increased from the con- stTuction of only six thousand yards 1 in 1909 to the construction of four hundred fifty thousand yards in 1913, The 1914 figures are not yet avail able, but in recent conference with the chairman of the Iowa Commis- sion, he expressed himself as strong 1 ly in favor of concrete pavements. , The complete cost in Iowa for this l pavement. under exceedingly good
 specified ations. is SLIP per square yard This cost including all en-
 gineering and overhead charges of every character as well as depreci- alton on equipment
 In Wayne County. Mich. where concrete pavements have been long est in use in this county, the main tenance cost is evidently low. and as will be observed from the letter of the engineer of the Highway Com
 mission of California, the bituminous | top dressing can be renewed when
 necessary, at less than F cent per | square foot
 | MT. E. J. Mehren. editor of En- gineering Record, who was recently | here, speaks very highly of concrete pavement, and stated that many cit ies were getting first class concrete pavement for $1.1o per square yard | recommended a E inch bituminous 1 carpet coat and advised that when properly laid such pavemcnts were giving satisfaction.