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GENERAL REQUIREMENTS FOR USE OF STABILIZERS
Table  18-2.Guide  for  Selecting  a  Stabilizing  Additive - 14071_428

Engineering Aid 2 - Intermediate Structural engineering guide book
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Fly  ash,  when  mixed  with  lime,  can  be  used effectively  to  stabilize  most  coarse-  and  medium- grained soils. However, the PI should not be greater than 25. Soils classified by the USCS as SW, SP, SP-SC, SW-SC, SW-SM, GW, GP, GP-GC, GW-GC, GP-GM, GW-GM, GC-GM, and SC-SM can be stabilized with fly ash. BITUMINOUS Most  bituminous  soil  stabilization  has  been performed  with  asphalt  cement,  cutback  asphalt,  and asphalt  emulsions.  Soils  that  can  be  stabilized effictively with bituminous materials usually contain less than 30 percent passing the No. 200 sieve and have a PI less then 10. Soils classified by the USCS as SW, SP, SW-SM, SP-SM, SW-SC, SP-SC, SM, SC, SM-SC, GW, GP, SW-GM, SP-GM, SW-GC, GP-GC, GM, GC, and   GM-GC   can   be   effectively   stabilized   with bituminous materials provided the above-mentioned gradation and plasticity requirements are met. Combination stabilization is specifically defined as lime-cement,  lime-asphalt,  and  lime-cement-fly  ash (LCF)  stabilization.  Combinations  of  lime  and  cement often are acceptable expedient stabilizers. Lime can be added to the soil to increase the workability and mixing characteristics of the soil as well as reduce its plasticity. Cement can then be mixed into the soil to provide rapid strength gain. Combinations of lime and asphalt are often acceptable stabilizers. The lime addition may prevent  stripping  at  the  asphalt-aggregate  interface  and increase the stability of the mixture. SELECTION OF A STABILIZER In the selection of a stabilizer additive, the factors that  must  be  considered  are  the  type  of  soil  to  be stabilized, the purpose for which the stabilized layer will be  used,  the  type  of  soil  quality  improvement  desired, the  required  strength  and  durability  of  the  stabilized layer,  and  the  cost  and  environmental  conditions. The soil gradation triangle in figure 18-1 is based upon  the  pulverization  characteristics  of  the  soil.  When Figure  18-1.—Soil  gradation  triangle. 18-3







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