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<br />' Hand-Operated Tampers <br />' Pneumatic tampers or gasoline-powered rammers may be used in areas where it is impractical <br />or undesirable to use tamping rollers. The operation of the hand-operated t:unpers shall be <br />' subject [o the approval of the Engineer and shall result in compaction to the level specified. <br />6.6.3 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 ul~ 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 Ibs per sq inch. The spacing of <br />the wheels shall be such that the distance between adjacent fire imprints during rolling will not <br />be greater than 50 percent of the width of a single tire. <br />' 6.6.4 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 [his weight <br />' being transmitted to the ground through the drum when the roller is standing ~n level ground <br />and attached to the pulling equipment. The drum shall not be less than 50 inches in diameter and <br />72 inches in width. <br />' 6.6.5 Special Compactors <br />' Special compactors may include: <br />• Loaded dump trucks; <br />• Hand guided, heavy-duty mechanical tampers; <br />• Hand guided vibratory rollers; and <br />• Such other compaction equipment as may be approved by the Engineer for use in <br />restricted areas or near certain critical installations. <br />Special compactors shall be capable of producing, with a reasonable numbe- of passes, the <br />' specified densities in the fill material on which they are used. <br />' -t~- <br /> <br />