Arizona republican., 1915-09-08
ORDINANCE NO. 69


 AN ORDINANCE ADOPTING SPECl-
 LEGATIONS FOR NATIONAL
 PAVEMENT.
 WHEREAS there is d certain patent ed street paving process known and designated Specifications No. 35, National Paving, and WHEREAS the City of Phoenix is about to enter upon q large amount of paving and contemplates laying upon its streets, alleys and other public ways that class of paving known as National Paving; and WHEREAS the specifications under which National Paving is constructed and laid are as follows. to wit: SPECIFICATIONS NO. 33. SPE CIFICA TONS FOR THE NATIONAL PAVEMENT SUB-GRADE
 The roadway must be brought to an established grade and crowned accord ing to grades given by the City En- gineer. Any low or wet places, indi- eating springs. must be thoroughly drained.
 The surface or the street to be paved shall be brought from the present sur face thereof to a sub grade which when properly prepared shall be .. inches below, and parallel with, the surface of the completed pavement.
 The sub-grade shall be rolled with a steam roller, weighing not less than ten G0) tons, until it is thoroughly Compacted and does not creep before the roller.
 PAVING MATERIAL.
 The mineral aggregate shall be com posed of earthy materials substantially free from crushed stone and gravel
 II shall be mechanically heated, dis integrated and dried.
 The prepared disintegrated material shall be of a dustlike form and shall be hot and dry so as to render it cap able of combining with the hot asphal- tic cement.
 The asphalt cement shall constitute not less than sixteen 16) per cent by weight of the paving material.
 These materials while hot shall be uniformly combined and mixed by ma chinery in such a manner that the az gregate mass when laid and rolled shall form a dense. malleable wearing sur face.
 The mixture thus prepared, while still in hot condition. shall be spread out with rakes upon the solidly rolled -----... base and shall be rolled with steam roller until the surface is thoroughly compact and smooth
 The finished pavement shall have the thickness of not less than .... inches. ASPHALTIC CEMENT
 l. Impurities:
 The asphaltic cement shall contain no water. decomposition products. granular particles. or other impurities. and shall be homogeneous
 ? Penetration:
 It must be of such consistency that. l when at a temperature of seventy seven CID degrees F., a No. , needle | weighted with one hundred 1OO) grams | will not in five (5) seconds penetrate | more than twelve 12) or less than ten i t10) millimeters.
 g. Loss by Volatilization.
 When twenty (2O) grams of the as- phaluc cement shall be heated to. and 1 held at, a uniform temperature of three hundred twenty-five (S25) degrees F.. for five (5) hours in cylindrical yes sel two and one-half (21b) inches in diameter, the loss shall not exceed four tD per cent. and the penetration after heating shall be more than one-haIf Gz) of the original penetration
 1. Ductility:
 When pulled vertically and the rate of one centimeter q c. m.) per minute in bath of water a cylinder of the aspnaltic cement one centimeter q C. M) in diameter. at a temperature at which it's penetration is fifty (50) shall elongatc to the extent of not less than thirty (30) centimeters before breaking
 ,. Solubility in Carbon Bisulphide:
 It shall be soluble to the extent of at least ninety mine (99) percent in chem