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five ton steel tired roller.Rolling shall begin <br />at the edges and progress to the center of the <br />surface uniformly lapping each preceding track <br />and covering thoroughly the entire surface. The <br />rolling shall be repeated as much as necessary <br />to insure thorough keying of the cover material <br />into the bituminous material.: <br />• <br />The second bituminous application and the second <br />application of cover material shall be done in a <br />manner as described above for the first application. <br />The finished surface shall be uniform and shall <br />conform to the lines, grades and typicalcross <br />sections. <br />3. Asphaltic Concrete Wearing Surface <br />This consists of the construction of an asphaltic <br />concrete surface course composed of a mixture of <br />aggregate, mineral filler and asphalt cement, pro- <br />perly laid upon a prepared base. The asphaltic <br />concrete shall be in conformance with the D.O.T. <br />Specifications for an asphaltic concrete surface <br />course type II, unless otherwise specified below. <br />The thickness will be as specified in approved <br />plans (minimum 1"), and it shall be placed on a <br />compacted base with a seal coat as specified in <br />these specifications. Pavement thickness more <br />than 1/8" deficient shall not be acceptable. <br />Before any bituminous material is applied, all <br />loose material, dust, dirt, caked clay and foreign <br />material which might prevent proper bond with the <br />existing surface will be moved to the shoulders <br />for the full width of the application. No bitum- <br />inous material shall be applied when the temperature <br />of the air is less than 50u E. or when, in the <br />opinion of the Engineer, the weather conditions <br />or the condition of the existing surface is unsuit- <br />able. After proper cleaning a tack coat shall be <br />applied with a pressure distributor. The bituminous <br />material shall be heated to a suitable consistency <br />as designated by the engineer. The bituminous <br />material shall be applied in a thin uniform layer. <br />The rate of application shall be between 0.04 to <br />0.08 gallons per square yard. The exact rate shall <br />be designated by the Engineer. The tack coat shall <br />be applied sufficiently in advance of the laying of <br />the wearing surface to permit drying, but shall not <br />be applied so far in advance or over such an area as <br />-9- <br />