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<br />Comoaction <br /> <br />Soil Cement shall be uniformly compacted to a minimum of 98% of maximum density as <br />determined by field density tests. Wheel rolling with hauling equipment only is not an <br />acceptable method of compaction. <br /> <br />At the start of compaction the mixture shall be in a uniform, loose condition throughout its full <br />depth. Its moisture content shall be as specified in the section on Required Moisture <br />(above). No section shall be left undisturbed for longer than thirty (30) minutes durin~1 <br />compaction operations. Compaction of each layer shall done in such a manner as to <br />produce a dense surface, free of compaction planes, in not longer than 1 hour from the time <br />water is added to the mixture. Whenever the operation is interrupted for more than two (2) <br />hours, the top surface of the completed layer, if smooth, shall be scarified to a depth of at <br />least 24.5 mm (1 inch) with a spike tooth instrument prior to placement of the next lift. The <br />surface after scarifying, shall be swept using a power broom or other method approved by <br />the engineer to completely free the surface of all loose material prior to actual placement of <br />the soil cement mixture for the next lift. <br /> <br />Finishine <br /> <br />After compaction, the soil cement shall be further shaped to the required lines, grades, and <br />cross section and rolled to a reasonably smooth surface. Trimming and shaping of the soil <br />cement shall be conducted daily at the completion of each day's production with a smooth <br />blade. <br /> <br />Curine <br /> <br />Temporarily exposed surfaces shall be kept moist as set forth in the section on Placing <br />(above). Care must be exercise to ensure that no curing material other than water is applied <br />to the surfaces that will be in contact with succeeding layers. Permanently exposed <br />surfaces shall be kept in a moist condition for seven (7) days, or they may be covered with <br />some suitable curing material, subject to the Engineer's approval. Any damage to the <br />protective covering within seven days shall be repaired to satisfaction of the Engineer. <br /> <br />Regardless of the curing material used, the permanently exposed surfaces shall be kept <br />moist until the protective cover is applied. Such protective cover is to be applied as soon as <br />practical, with a maximum time limit of twenty-four (24) hours between the finishing of the <br />surface and the application of the protective cover or membrane. When necessary, the soil <br />cement shall be protected from freezing for seven (7) days after its construction by a <br />covering of loose earth, straw or other suitable material approved by the Engineer. <br /> <br />Construction Joints <br /> <br />At the end of each day's work, or whenever construction operations are interrupted for more <br />than two (2) hours, a 15% minimum skew transverse construction joint shall be formed by <br />cutting back into the completed work to form a full depth vertical face as directed by the <br />Engineer. <br /> <br />2.10 <br />