Reduction of Sulfate Swell in Expansive Clay Subgrades in the Dallas District

Bredenkamp, Sanet; Lytton, Robert L.

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Reduction of Sulfate Swell in Expansive Clay Subgrades in the Dallas District

1994-11-01
By Bredenkamp, Sanet ; Lytton, Robert L.

File Language:

English

Details

Creators:

Bredenkamp, Sanet ; Lytton, Robert L.
Corporate Creators:

Texas Transportation Institute. Texas A&M University
Corporate Contributors:

Texas. Dept. of Transportation. Research and Technology Transfer Office
Subject/TRT Terms:
Publication/ Report Number:

TX-9511994-5
Resource Type:

Tech Report
Geographical Coverage:

United States ; Texas
Edition:

Interim: September 1993 - August 1994
Corporate Publisher:

Texas Transportation Institute. Texas A&M University
Abstract:

The addition of hydrated lime to clay soils is one of the most common methods of soil stabilization. However, when sulfates are present in the soil, the calcium in the lime reacts with the sulfates to form ettringite, an expandable mineral. This expansion causes a considerable amount of economical as well as structural problems. Sulfate related heave has been experienced along IH 45 and FM 1382. In this research, a field test method was developed to locate sulfate bearing soils. A permittivity probe was used to measure the electrical conductivity of the in-situ soil. The electrical conductivity was then related to sulfate content in soils. Expansion tests were performed to determine the amount of expansion that occurs when lime is added to soils with different sulfate contents. A model that relates the amount of expansion of clay soils to electrical conductivity was proposed. The use of low calcium fly-ashes were investigated and proposed as an alternative form of stabilizer for sulfate bearing soils.
Format:

PDF
Funding:

7-1994, Task 16
Download URL:

https://rosap.ntl.bts.gov/view/dot/83393/dot_83393_DS1.pdf
File Type:

[PDF - 4.24 MB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:6772f37d1e33d642a1af7352055a79db9d5de4090499a6fe970ba2c5b651f02d4cd1a9cc2584f75963a0cb90e255e5d2354daad42a20579759c97838d92d2199

File Language:

English

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