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0 <br />1 <br />1 <br />0 <br />0 <br />1 <br />0 <br />cloride, organic matter, or other deleterious substances, and the soil for this base course <br />shall consist of the natural material in the roadway or selected soil placed in the roadbed. <br />Portland cement shall be applied in the amount determined by tests run by the engineer for <br />the particular soil to be used. No processing of the base shall be started until all -tests <br />of the soil to be used have been completed and the exact quantity of cement required for the <br />particular soil has been determined. The quantity of water required shall be the amount <br />necessary for optimum moisture content in the compacted mixture. The hand squeeze procedure <br />for determining moisture content may be used. <br />All equipment necessary for the proper construction of this work shall be on the <br />project in first class working condition, and shall have been approved by the engineer before <br />construction is started. Unless otherwise approved a Seaman Mixer or a P&H Pulvi Mixer shall <br />be used to mix the material in place and a sheep's foot roller shall be used for compaction. <br />No forms will be required unless specified. <br />Before undertaking this work the sub -grade shall have been shaped and compacted as <br />specified in Section X -3(c). Prior to the application of cement the soil to be treated shall <br />be pulverized for sufficient width and depth to give the compacted cross section shown on the <br />plans. All roots and other foreign matter whall be removed. <br />After the soil aggregate is shaped to the approximate cross sections as shown on <br />the plan the specified quantity of portland cement required shall be distributed uniformly <br />over the surface. No cement shall be applied where the moisture content of the soil immediate <br />beneath the pulverized material exceeds the moisture content specified by the engineer. No <br />cement shall be applied during periods of high winds which make occasional loss of cement. <br />Immediately after the cement has been distributed it shall be mixed with the loose soil for <br />the full depth of treatment. Mixing shall be continued and repeated as often as necessary, <br />as determined by the engineer, to insure a thorough uniform and intimate mix of the soil and <br />cement and until the resulting mixture is homogeneous and uniform in appearance. The mixture <br />shall then be shaped to the approximate lines and grades shown on the plans. Only that amount <br />of roadway which can be completed within the working day is to be mixed with cement. Imme- <br />diately after mixing of soil and cement is complete the moisture content of the soil cement <br />mixture.'shall be determined by the engineer and if required water shall be applied in such <br />quantity and at such rate as directed by the engineer until the proper moisture content is <br />obtained. 'he Base shall then be uniformly compacted with sheep's foot rollers until the feet <br />of the roller walk out to within la inches of the surface. After the mixture is compacted, the <br />surface of the base shall be reshaped to the required lines, grades and cross section. The <br />surface shall then be thoroughly rolled with a neumatic tired roller exerting a compression <br />of not less than 200 pounds per inch width of each tire both front and rear, followed by a <br />motor grader, and then the smooth wheel tandem roller weighing from 5 to 8 tons. Rolling shall <br />continue until all rutting ceases and until the entire base conforms to the density require - <br />meets specified by the engineer. <br />A wooden header cut to proper crown shall be placed perpendicular to the sub -grade <br />and at right angles to the center line at the end of each day's run. Extreme care must be <br />