Recommended Practice for Stabilization of Subgrade Soils and Base Materials (2009) / Chapter Skim
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Pages 11-16
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9 Spacing of test pits during soil investigations should be dependent on the geologic complexity of the project area. Frequency of sampling should be based on the uniformity of soil, intent and level of investigation required and the potential for detrimental reactions with the soil during chemical stabilization processes.
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10 ≤ 25 % passing No. 200 ≥ 25 % passing No.
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11 Soil exploration and sampling should be performed as described in the preceding sections. The soil can be classified as either a subgrade category or base category material on the basis of AASHTO M145.
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12 The National Lime Association recommends a plasticity index of 10 or greater in order for lime to be considered as a potential stabilizer whereas the U.S Army Corps of Engineers recommends a plasticity Index of 12 or greater for successful lime stabilization (6, 16)
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13 hydration process, just as in the hydration of cement, free lime is released, which can react pozzolanically with the clay. This reaction reduces clay particle plasticity and improves strength.
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14 unique experiences as tempered by local conditions. It is important to remember that Figures 2 and 3 are "guidelines" but the final selection should be based on a more specific analysis of the soils.
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