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1 <br />' Types of TamyinE Rollers <br />' The roller shall beself-propelled or pulled by a crawler-type tractor of sufficient power to <br />operate the roller at a speed of approximately 3 mph. The design and operation of the roller will <br />' be subject to approval of the Engineer, and the Contractor shall at any time make such minor <br />alterations or adjustments to the operations or equipment, as drrected by the Engineer, to secure <br />optimum compaction. <br />Hand- rated Tampers <br />Pneumatic tampers or gasoline-powered yammers may be used in areas where it is impractical <br />or undesirable to use tamping rollers. The operation of the hand~petated tampers shall be <br />' subject to the approval of the Engineer and shall result in compaction to the level specified. <br />' 6.8.3 Pneumatic-Tired Rollers <br />Pneumatic-tired rollers shall have a minimum of four wheels equipped with pneumatic tires, and <br />a body suitable for ballast loading such that the load per wheel can be varied up to 30,000 lbs. <br />The roller wheels shall be located abreast and be designed such that each wheel exerts <br />' approximately the same load under any condition likely to be encountered during its use, <br />especially conditions met in traversing uneven ground. The tires shall be such that fire pressures <br />during roller operations can be maintained at approximately 90 lbs per sq inch. The spacing of <br />' the wheels shall be such that the distance between adjacent fire imprints during roiling will not <br />be greater than 50 percent of the width of a single tire. <br />' 6.8.4 Drum Rollers <br />' Drum rollers shall be of the smooth, single steel-drum type and shall be equipped with a suitable <br />cleaning device to prevent the accumulation of material on the drum during rolling. Each roller <br />shall have a total static weight of not less than 10 tons with at least 90 percent of this weight <br />being transmitted to the ground through the drum when the roller is standing an level ground <br />and attached to the pulling equipment. The drum shall not be less than 50 inches im diameter and <br />' 72 inches in width. <br />6.8.5 Special Compactors <br />Special compactors may include: <br />' • Loaded dump trucks; <br />' -19- <br /> <br />