Details:

Creators:
Browning, Gary
Corporate Creators:
Mississippi. Dept. of Transportation. Research Division
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Expansive Soils
Moisture Barrier
Pavements
Moisture Barriers
Swelling Soils

Publication/ Report Number:
FHWA/MS-DOT-RD-99-21 & 23
Resource Type:
Tech Report
Geographical Coverage:
Mississippi
Edition:
Final report.
Corporate Publisher:
Mississippi. Dept. of Transportation
NTL Classification:
NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ; NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ;
Abstract:
This report is an extension report and examines one of the measures being tried to stabilize the development

of pavement damage on expansive soils, which is the use of horizontal moisture barriers. The moisture barrier

will not stop horizontal flow, but is designed to stop rainwater from penetrating into the subgrade soils

thus reducing soil swelling, measured by a reduction in the moisture variance.

On both sides of the roadway, the moisture barrier begins 9' (2.74 m) from the pavement centerline, extends to

6' (1.83 m) beyond the bottom of the ditch, and is under a minimum of 18" (0.46 m) of soil. The performance

of the moisture barrier was measured twice yearly by moisture sampling and four times yearly by roadway

roughness measurements.

The moisture barriers on both project did not reduce the IRIs or the moisture variance, as they were expected

to do. Future use of this design of horizontal moisture barriers on pavements is not recommended. The

moisture barrier did not produce a smoother ride than the unprotected pavement in the roughness tests or reduce

the moisture variance.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:473129b6c7b6102bf139e3cb2a0bc3929e0a4e04c5a727a56fc3b2ad2868c4e3
File Type:

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