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2.4.3 Soil Cement <br />Soil cement may be used to stabilize the pitside slopes of <br />riverside berms against erosion during overtopping. The soil <br />cement must be placed on the pitside slope face in maximum <br />8-inch lifts at a width of 6 to 8 feet. The general geometric <br />configuration of the soil cement stabilization will conform to <br />the requirements as shown on Figure 2.6. <br />Soil cement will consist of a mixture of Portland cement, <br />native soils (if conforming to gradation limitations) and <br />water. Native soils may be used if they conform to the follow- <br />ing three requirements: (1) the soil contains no material re- <br />tained on a 2-inch sieve; (2) at least 55 percent of the mate- <br />rial passes the No. 4 sieve; and (3) between 5 percent and 35 <br />percent of the material pass the No. 200 sieve. The soil <br />cement mixture should have a minimum of 10 percent Type 2 Port- <br />land cement as measured by weight. The moisture content of the <br />soil should range between 10 and 15 percent. In order to <br />determine the proper cement content, optimum moisture content <br />and maximum density of the soil cement mixture, standard labo- <br />ratory tests must be performed. These test are: ASTM D558, <br />D559 and D560. <br />Mixing of the soil and cement may be accomplished at the site <br />with mechanical means such as dozers, loaders, etc. or with <br />mechanical batch mixing equipment specifically designed for the <br />preparation of soil cement mixtures. Placement of the mixed <br />and moistened soil cement mixture may be accomplished by stan- <br />dard construction means. Compaction will be accomplished with <br />normal embankment compaction equipment which shall include <br />sheepsfoot roller compaction in order to minimize weaknesses at <br />the interface between successive lifts of soil cement. <br />UD6FCD GRAVEL GUIDELINES 12/17/87 <br />2-16 <br />