1925 (#1403-1607) - Laserfiche WebLink

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CITY OF SANTA ANA, CALIFORNIA STANDARD SPECIFICATION NUMBER 103. Asphaltic Concrete Wearing Surface. (Fine Graded Type) ~'FION r. DESCRIPTION. Upon a base prepared and constructed as hereinbefore specified shall be lald an Asphaltic Concrete Wearing Surface of such width and cross-section as shown on the plans, in accordance with the following specifications. SECTION 2. THICKNESS. The thickness of the wearing surface shall be as shown on the plans and shall be held to be its minmium thickness after compression. SECTION ,3. COMPOSITION. The asphaltic Concrete Wearing Surface shall be composed of asphalt cement, broken stone, sand and stone dust as hereinbefore specified, in the following proportions, by weight: Per cent Asphaltic Cement ............................................................................................................................ 7.5 to 9 Passing a two hundred (200) mesh screen .............................................................................. ? to 12 Passing a ten (10) mesh screen and retained on a two hundred (200) mesh screen..34 to 60 Passing a one-quarter (~) inch screen and retained on a ten (10) mesh screen........15 to 30 Passing a one-half (~) inch screen and retained on a one-quarter (~) inch screen..lO to 25 O{ the portlo~ passing a ten (10) mesh screen and retained on a two hundred (200) mesh screen, from 60 to 80 per cent shall pass a forty (40) mesh screen and from 20 to 40 per cent shall pass an eighty (80) mesh screen. ~CTION 4. MIXING, (a) The asphalt cement shall be heated in kettles or tanks designed to secure uniform heating of the entire contents and shall be brought to a temperature of not less than 2~1° Fahrenheit to not more than ~0° Fahrenheit. (b) The coarse and fine aggregate for the asphaltic ~oncrete wearing surface mixture shall be dried and heated at the paving plant in suitably designed revolving driers. The mixture shall be heated to a temperature of not less than two hundred fifty (250') degrees Fahrenheit to not more than three hundred fifty ($~1°) degrees Fahrenheit as determined on the mixing platform. The temperature shall be taken in the bins. The aggregates may be simultaneously fed into the same drier, but in that case they shall, immediately after heating, be screened into at least three ($) dlfferent sizes and stored in separate bins. (c) Each batch shall be combined and mixed as follows: The coarse and fine aggregates consisting of at least three (3) different sizes shall be separately and accurately weighed hy means of multiple beam or dlal scales of sufficient capacity to weigh the entlrc batch to be mixed. The required amount of asphalt cement for each batch shall he measured by actual welghlng with the scales attached to the asphalt c~nent bucket. The mixture shall be made in an approved twin plug mixer, having at least forty-eight (48) paddles which shall rotat~c not less than seventy (70) nor more than ninety (~0) revo-