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<br />I <br /> <br />I <br /> <br />SECTION 02219 <br /> <br />I <br /> <br />manufactured by Black, Sivals and Bryson, Inc., Kansas <br />City, Mo., with rupture di~CS suitable for between 50 and <br />75 psi rupturing pressure. <br /> <br />I <br /> <br />-. Tamping feet. At least one tamping foot shall be <br />provided for each 100 square inches of drum surface. l"he <br />space measured on the surface of the drum, between the <br />centers of any two adjacent tamping feet, shall be not <br />less than 9 inches. The length of each tamping foot from <br />the outside surface of 'the drum shall be not more than 11 <br />inches and shall be maintained at not less than 9 inches. <br />The cross sectional area of each tamping foot shall be not <br />mor-e than 10 square inches at a plane normal to the axis <br />of the shank 6 inches from the drum surface, and shall be <br />maintained at not less than 7 square inches nor more than <br />10 square inches at a plane normal to the axis of the <br />shank 8 inches from the drum surface. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />~. Roller weight. <br />loaded shall be not <br />length of drum. <br /> <br />The weight of a roller when fully <br />less than 4,000 pounds per foot of <br /> <br />I <br /> <br />4. Rollers shall be drawn by crawler-type or rubber-tired <br />tractors. The use of rubber-tired tractors shall be <br />discontinued if the tires leave ruts that prevent uniform <br />compaction by the tamping roller. Tractors used for <br />pulling rollers shall have .ufficient power to pull the <br />rollers satisfactorly when drums are fully loaded. <br /> <br />I <br /> <br />I <br /> <br />5. At the option of the contractor, selfpropelled tamping <br />r"ollers conforming with the above requirements may be used <br />in lieu of tractor-drawn tamping rollers. For <br />selfpropelled rollers, in which steering is accomplished <br />through the use of rubber-tired wheels, the tire pressure <br />shall not exceed 40 psi. During the operation of rolling, <br />the spaces between the tamping feet shall be maintained <br />clear of materials which would impair the effectiveness of <br />the tamping rollers. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />E. Compaction. When each layer of material has been <br />conditioned to have the specified moisture, it shall be <br />compacted by passing the tamping roller over it 12 times, <br />and when compacted the density shall be essentially <br />uniform throughout the layer. If the uncompacted <br />earthfill material is too wet for proper compaction, the <br />earthfill material shall be worked with harrow, scarifier, <br />or other suitable equipment to ruduce the moisture content <br />to the amount specified; shall be allowed to dry until <br />such time as the material contains only the specified <br />moisture content; or the material shall be removed from <br />the embankment. Compacted earth material having a <br />moisture content or dry density that do not meet the <br />criteria specified above shall be reworked and rerolled, <br />as directed by the Engineer to obtain the specified <br />moisture content and dry density of embankment in place. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />39 <br />