Details:

Creators:
Elseif, Mostafa
Corporate Creators:
Louisiana Transportation Research Center
Subject/TRT Terms:
[+]
Calcium Oxide Field Tests Laboratory Tests Pavement Design Pavement Layers Soil Stabilization Specifications
Publication/ Report Number:
15-2GT
Resource Type:
Brief
Geographical Coverage:
Louisiana
Corporate Publisher:
Louisiana Transportation Research Center
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.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:40ee6f24d561fb47ca2d1c3e0d659c3de99d54402ebf8d480026e38b646c370a
Download URL:
https://rosap.ntl.bts.gov/view/dot/29002/dot_29002_DS1.pdf
File Type:

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