Lime utilization in the laboratory, field, and design of pavement layers : [research project capsule].
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2015-05-01
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Abstract:Nearly two-thirds of highways in the United States are constructed on in-place soils
with poor or undesirable characteristics. These materials demonstrate undesirable
engineering behavior, such as low bearing capacity, high shrink/swell potential, and
poor durability. Removing these existing soils can be expensive and/or impractical.
Traditionally, modification and stabilization of the soil with lime, cement, and fly ash
has been used to facilitate the construction process and to enhance the mechanical
properties of the soil. For successful soil modification and stabilization, selecting
an optimum content of a suitable stabilizer is critical. Adequate mixing, curing, and
compaction are other important factors to achieve satisfactory field performance. Lime
is generally more suited for treating plastic clays with shrink/swell potential. The two
main reactions from lime are cation exchange and flocculation-agglomeration; both of
these reactions significantly improve soil properties and workability.
Lime modification is a time-tested practice in Louisiana to create a working table and its
performance has been generally adequate. However, the working table is not assigned
a structural coefficient value during the design process. Nevertheless, lime modification
and stabilization can offer numerous advantages: improved soil properties, especially for
expansive soils; strength gain with time; and possible reduction in pavement thickness
if accounted for during the pavement design. The consideration of lime is justified given
that laboratory and field studies show that lime-modified subgrades outperform soils
without lime modification.
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