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231
Task 2. Survey bond and insurance companies and
associations to obtain the results of their experience with
highway contractors. This survey should address, as a
minimum, the cost and availability of bonds and insur-
ance, the impact of business failures within the bond and
insurance industry, and any industry plans, suggestions,
or potential changes that would influence the industry
and serve to increase the availability or reduce the cost
of bonds and insurance.
Task 3. Based on the results of Tasks 1 and 2, provide
an analysis and a prioritization of the primary factors
that affect cost and availability of bonds and insurance.
Task 4 Submit an interim report within 9 months after
the start of research. The interim report shall summarize
the results of Tasks 1 through 3 and include an outline
for accomplishment of Task 5. NCHRP approval will be
required before commencing Task 5.
Task 5. Develop recommendations for actions to solve
the problems associated with the factors prioritized in
Task 3. Develop research plans for those factors that
require additional research. Provide an estimate of cost
and duration for accomplishing each research plan.
Task 6. Submit a final report documenting all research
findings.
AREA 21: TESTING AND
INSTRUMENTATION
Project 21-1 FY '70
Instrumentation for Measurement of Moisture
Research Agency:
Principal Invest.:
Elective Date:
Completion Date:
Funds:
Research Triangle Institute
Dr. L. F. Ballard
August 25, 1969
February 24, 1971
$35,027
The objective of this project was to evaluate, on the
basis of a comprehensive literature review, the suitability
of existing instrumentation and techniques to measure the
amount and state of water in highway components such
as embankments, subgrades, base courses, and structures.
The research has been completed, and the project report
has been published as: NCHRP Report 138, "Instru-
mentation for Measurement of Moisture Literature Re-
view and Recommended Research."
Project 21-2 FY ,71
Instrumentation for Moisture Measurement'-
Bases, Subgrades, and Earth Materials
(Sensor Development)
Research Agency: Southwest Research Institute
Principal Invest.: Dr. C. G. Gardner
Elective Date: February 1, 1972
Completion Date: January 31, 1974
Funds: $64,976
The objectives of this project were to design, build
prototype models, and conduct laboratory verification
programs for one or more sensors capable of measuring
moisture in granular and soil materials that would be
suitable for highway needs. During the initial phase of
the study, nuclear magnetic resonance (NMR) and mi-
crowave absorption approaches were investigated inde-
pendently. In general, satisfactory performance was
achieved using the NMR approach, but considerable dif-
ficulty was encountered with the microwave technique.
As a result, the experimental verification phase was lim-
ited to the NMR sensor.
Research has been completed, and an NMR sensor has
been developed for measurement of moisture in fine-
grained soils. The prototype model has undergone labo-
ratory testing and is considered suitable for further de-
velopment and field evaluation.
The technology on which the prototype sensor is based
is described in a paper by Gardner & Matzkanin, pub-
lished in TRB Record 532. Information contained in the
project report is included in the Project 21-2~3) report.
Project 21-2~2) FY '72
Instrumentation for Moisture Measurement-
Bases, Subgrades, and Earth Materials
(Sensor Development)
Research Agency:
Principal Invest.:
Elective Date:
Completion Date:
Funds:
State U. of New York at Buffalo
Dr. E. T. Selig
April 1, 1972
September 30, 1973
$29,953
The objectives of this project were to design, build a
prototype model, and conduct a laboratory verification
program for a sensor capable of measuring moisture in
granular and soil materials that would be suitable for
highway needs.
Research has been completed, and a sensor has been
developed based on the use of electrical capacitance as a
measure of soil moisture. The prototype model has under-
gone laboratory testing and is considered suitable for fur-
ther development and field evaluation.
The technology on which the prototype sensor is based
is described in a paper by Selig, Wobschall, Mansukhani,
and Motiwala published in TRB Record 532. Information
contained in the project report is included in the Project
21-2(3) report.
Project 21-2(3) FY ,75
Instrumentation for Moisture Measurement-
Bases, Subgrades, and Earth Materials
(Sensor Evaluation)
Research Agency: Southwest Research Institute
Principal Invest.: George A. Matzkanin
E. T. Selig (SUNY)
September 3, 1974
Effective Date:
Representative terms from entire chapter:
earth materials
