4/1/1958 - Laserfiche WebLink

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n U C 0 1 0 1 1 40 All equipment necessary for the proper construction of this work shall be on the project, in first class working condition, and shall have been approved by the engineer be� fore construction is started. Before any bituminous material is applied, all loose material, dust, dirt, caked clay and foreign material which might prevent proper bond with -the existing surface will be moved to the shoulders for the full width of the application. No bituminous material shall be applied when temperature of the air is less than 50 degrees F. or when in the opinion of the engineer, weather conditions or the condition of the surface is unsuitable. An approx- imate 2 week curing period for seal coat shall be given before the surface course is applied. The asphalt shall be applied at a temperature of between 275 degrees and 325 degrees F. The exact temperature shall be such as will ensure uniform distribution and shall be designated by the engineer. Immediately.after spreading and dragging the cover material, the entire sur- face must be rolled with a 5 ton to 8 ton pneumatic traffic roller. The rolling in all cases shall begin within 30 minutes after spreading of the material. Rolling shall begin at the edges and progress to the center of the surface uniformly lapping each preceding track and covering thoroughly the entire surface. e.3) Double Bituminous Surface Treatment This wearing surface to consist of a double application of bituminous material covered with a double application of cover material, applied on a previously prepared base with seal coat in accordance with the specifications. The bituminous material shall be asphalt grade AC -15 or an asphalt material which has had specific approval. The cover maters shall be State Road Specification Rock Grade II and the.second course cover material shall be State Road Specification Rock Grade 15, or approved slag material. The first application of bituminous material shall be from .18 to .25 gallons per square year and a cover material from .40 to .50 cubic feet per square yard. The second application of bituminous material shall be from .25 to .35 gallons per square yard and the second application of cover material to be from .22 to .25 cubic feet per square yard. All equipment necessary for the proper construction of this work shall be on the project, in forst class working condition, and shall have been approved by the engineer before the construction has started. The surface to be covered shall be swept clean and free from sand, dirt and dust and other deletrious material by means of mechanical road sweepers, hand brooms, and approved mechanical blowers, and shall be free from moisture. The existing seal coat must have an approximate 2 week curing period before the application of the first bituminous coat. No bituminous material shall be applied when the temperature of the air is less than 50 degrees F. or when in the opinion of the engineer, the weather conditions or the condition of the exist ing surface is unsuitable. The asphalt material grade AC -15 shall be applied at a temperature of between 275 degrees and 325 degrees F. The exact temperature shall be such as will ensure uniform distribution and shall be designated by the engineer.