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during periods of high winds which make occasional <br />loss of cement. Immediately after the cement has <br />been distributed it shall be mixed with the loose <br />soil for the full depth of treatment. Mixing shall <br />be continued and repeated as often as necessary as <br />determined by the Engineer, to insure a thorough <br />uniform and intimate mix of the soil and cement <br />and until the resulting mixture is homogeneous and <br />uniform in appearance. <br />The mixture shall then be shaped to the approximate <br />lines and grades shown on the plans. Only that <br />amount of roadway which can be completed within <br />the working day is to be mixed with cement. Imme- <br />diately after mixing of soil and cement is complete <br />the moisture content of the soil cement mixture <br />shall be determined by the engineer and if required <br />water shall be applied in such quantity and at such <br />rate as directed by the engineer until the proper <br />moisture content is obtained. The base shall then <br />be uniformly compacted with a roller until the <br />required compaction is obtained. After the mixture <br />is compacted, the surface of the base shall be <br />reshaped to the required lines, grades and cross <br />section. The surface shall then be thoroughly <br />rolled with a pneumatic -tired roller exerting a <br />compression of not less than 200 pounds per inch <br />width of each tire both front and rear, followed <br />by a motor grader, and then a smooth wheel tandem <br />roller weighing from 5 to 8 tons. Rolling shall <br />continue until all rutting ceases and until the <br />entire base conforms to the requirements specified <br />by the engineer. <br />A wooden header cut to proper crown shall be placed <br />perpendicular to the sub -grade and at right angles <br />to the center line at the end of each day's run. <br />Extreme care must be exercised to overcome any <br />tendency for the base in the vicinity of a junction <br />between runs to fail to be full thickness and true <br />to grade or to be inadequately compacted, improperly <br />proportioned, inadequately wetted, or incompletely <br />mixed. When any of these operations, after the <br />application of cement are interrupted for more than <br />two hours for any reason, or when the uncompacted <br />soil cement mixture is wetted by rain so that the <br />required moisture content is lost, the entire section <br />shall be reconstructed, except that the quantity of <br />cement to be added to the previously Processed soil <br />cement mixture shall be 50% of the amount originally <br />.specified. <br />