Table 18-2.—Guide for Selecting a Stabilizing Additivethese characteristics are combined with certain3) indicated at the intersection of the three materialrestrictions relative to liquid limit (LL) and soilpercentages are used to enter table 18-2 to select the typegradation contained in table 18-2, they provide guidanceof stabilizing additive based on the various restrictionsfor the selection of the additive best suited forand remarks. For example, a soil having a PI of 15 andstabilization. Figure 18-1 is entered with the percentage57-percent gravel, 26-percent sand and 7-percent finesof gravel (percent material retained on the No. 4 sieve),sand (percent material passing the No. 4 sieve andfall in area 2B of figure 18-1.Table 18-2 indicates thatretained on the No. 200 sieve), and fines (percentcement, lime, LCF, or bitumen could be considered.material passing the No. 200 sieve) to determine the areaHowever, the PI of 15 eliminates bitumen, and the factin which the soil gradation falls. The areas (1A, 2C, andthat only 33 percent of the material passes the No. 418-4
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