00389567

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http://onlinepubs.trb.org...s/trr/1983/945/945-003.pdf

https://scholar.google.co...berg&publication_year=1983

The rehabilitation of a section of Interstate 37 in San Antonio, Texas, was undertaken to correct a chronic problem of expansive clay roughness. A vertical moisture barrier was placed down to a depth of 8 ft (2.4m) along the outside shoulders of thee northbound and southbound lanes. Several concurrent measurements, including the measurement of matrix suction at both sides of the membrane at several depths, were made in the laboratory and in the field to evaluate the effectiveness of the moisture barrier. The calibration of the thermal moisture sensors that are used to measure suction, the difficulties encountered in the calibration process and how they were overcome, and the installation of the sensors in boreholes on each side of the moisture barrier are described in this paper. The devices are sensitive and accurate in measuring suctions above--1 bar but lose sensitivity below that level of suction. The sensors are expected to provide stable readings for several years. The site and soil conditions, the placement and cost of installing the vertical moisture barrier, and subsequent indications of moisture changes inside and outside of the barrier are also described. (Author)

Publication of this paper sponsored by Committee on Environmental Factors Except Frost and Committee on Soils and Rock Instrumentation. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01420444

pp 16-21

1983

Transportation Research Record

0309036666

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Figures (10) ; Maps (1) ; Photos (2) ; References (12)

Alignment; Boreholes; Calibration; Highways; Improvements; Instrumentation; Measuring instruments; Moisture barriers; Sensors; Soil suction

Interstate Highway System

Membranes; Vertical alignment

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

Oct 30 1984 12:00AM

• ANALYSIS OF A SPILING REINFORCEMENT SYSTEM IN SOFT-GROUND TUNNELING
• CHARACTERISTICS OF BASE AND SUBGRADE DRAINAGE OF PAVEMENTS
• CHARACTERISTICS OF RED CLAY OF DOUGLAS COUNTY, WISCONSIN
• COMPACTIVE PRESTRESS EFFECTS IN CLAYS
• GEOTECHNICAL EVALUATION OF LOESSIAL SOILS IN KANSAS
• INVESTIGATION OF MOISTURE-INDUCED VARIATION IN SUBGRADE MODULUS BY CROSS-CORRELATION METHOD
• ULTIMATE BEARING CAPACITY OF CLOSELY SPACED STRIP FOUNDATIONS
• ULTIMATE UPLIFT CAPACITY OF PILES IN SAND