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strategic Highway Research hogram Executive committee John R. Tabb, chairman Mßsßsippi Departmew of Transponation

William G. Agnew General Motors Research (retired)

E. Dean Carlson, ex, fficio Federal Highway Administration

A. Ray Chamberlain Colorado Ðepartment ol Transportaîion

Michael J. Cuddy New York Department oÍ Transportation Raymond F. Decker Universíty Science Partuers Inc. Thomas B. Deen, ex officio Transportation Re s e arch Bo ard Thomas M. Downs New lers ey D epartmeft of Transportation Francis B. Francois, ex fficio American Association of State Highway and Transponation

fficials William L. Giles Ruan Transportation Managenent Sstems Jack S, Hodge

Virginia Departmetú of Transportation Boris Hryhorczuk, ex fficio M anitoba D epanment of Transportation

Lucas

Donald W. Indiana D epartment of Transponation

Damian L Kulash Executive Dírector

Michael

Harold L. Purdue Universíty

Guy W. Hager Inplementation Manager

Muri

Wayne

Key SIIRp Staff

Missouri Highway and Transportation Depaflment

M. Lee Powell,

Etlward T. Harrigan Asphalt Progran Manager

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Ballenger Paving Company, Inc. Rodney

oficio

E.

Slater, ex Fede ral Hi ghway Administration

Henry

A.

Texas Departnent

Stânley

I.

Jr. ofTransportation

Thomason,

Warshaw

National Institute ofstandørds Roger Apcon

Yarbrough Corporation

L.

Ibthryn Harrington-Hughes Conurunications Direclor Don M. Harriot Concrete & Structureslffiighway Operations ProgrønManager

Neil F. Hawks

andTechnology

Inng-TermPavement Performance ProgramMantager Harry Jones Finance & Adnínistratíon Dírector

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SHRP-P-689

Evaluation of a Time l)omain Reflectometry Technique for Seasonal Monitoring of Soil Moisture Content Under Road Pavement Test Sections

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Radu Andrei, Doctorant Engineer National Highway Administration of Romania

A. Robert Raab, Ph.D., P.E. Strategic Highway Research Program David C. Esch, P.E. Alaska Department of Transportation

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SHRP-P-689

Product no. 5030 Program Manager: Neit F. Hawl