March/April
2002
Recent
Publications
Compiled
by Zac Ellis of FHWA's Office of Research and Technology Services
Below
are brief descriptions of reports recently published by the Federal
Highway Administration's (FHWA) Office of Research, Development, and
Technology. All of the publications are available from the National
Technical Information Service (NTIS). In some cases, limited copies
of the publication are available from the Research and Technology
(R&T) Report Center.
When ordering from NTIS, include the NTIS PB number (or publication
number) and the publication title. You may also visit the NTIS Web
site at www.ntis.gov to order publications online. Call NTIS for current
prices. For customers outside the United States, Canada, and Mexico,
the cost is usually double the listed price. Address requests to:
National
Technical Information Service
5285 Port Royal Road
Springfield, VA 22161
Telephone: (703) 605-6000
Toll-free number: (800) 553-NTIS (6847)
Expanded Sales Desk Hours: 8 a.m. to 8 p.m. EST, Mon.-Fri.
Requests for items available from the R&T Report Center should
be addressed to:
R&T Report Center, HRTS-03
Federal Highway Administration
9701 Philadelphia Court, Unit Q
Lanham, MD 20706
Telephone: (301) 577-0906
Fax: (301) 577-1421
For more information on research and technology publications coming
from FHWA, visit the Turner-Fairbank Highway Research Center's (TFHRC)
Web site at www.tfhrc.gov, FHWA's
Web site at www.fhwa.dot.gov,
the National Transportation Library's Web site at http://ntl.bts.gov,
or the OneDOT information network at http://isweb.tasc.dot.gov/library/library.htm.
Accelerated
Aging of Concrete: A Literature Review Publication No. FHWA-RD-01-073
This
report provides a review of the literature on accelerated aging of
concrete. It was undertaken as part of a research project on predicting
the long-term environmental performance of portland cement concrete
(PCC) pavements containing coal fly ash. An accelerated aging regime
involving temperature, cyclic loading, and freeze-thaw cycles was
employed in this project to simulate natural long-term aging processes.
This
literature review describes the general concept of aging materials
and defines accelerated aging. It describes accelerated aging procedures
and applications of accelerated aging, and discusses thermal aging,
the most common accelerated aging technique. Accelerated aging techniques
and applications for several types of materials are described, followed
by a review of accelerated aging procedures and applications for PCC.
Fundamental
Properties of Asphalts and Modified Asphalts — Volume I: Interpretive
Report Publication No. FHWA-RD-99-212
The
Superpave binder specification developed during the Strategic Highway
Research Program (SHRP) from 1987 to 1993 classifies construction-grade
asphalts into rheologically similar groups. All asphalts in a given
grade have the same rheological properties to within 6ºC. The
mission of this project was to improve the understanding of the expected
performance of petroleum asphalts under service conditions. These
conditions include physical behavior of thin asphalt films in contact
with aggregate, rheology and oxidative aging of wet asphalt, behavior
of asphalt after extended aging, and propensity of asphalt films to
reconsolidate (heal) after microcracking.
These
phenomena are not described by the current binder specification. The
results of these exposures are included in this document and have
been used to produce a comprehensive chemical model of petroleum asphalt.
Finally, the results have been used to develop new analytical methods
that improve the capability of predicting the performance of asphalt
in roadway service. These 16 new tests are described in Volume II
of this report.
Fundamental
Properties of Asphalts and Modified Asphalts — Volume II: Final
Report, New Methods Publication No. FHWA-RD-99-213
Sixteen new methods that distinguish behavioral characteristics
of compositionally diverse petroleum asphalts were developed or refined
into new methods during this project. These methods include: an automated
Heithaus titration; high-performance liquid chromatography/size exclusion
chromatography; large-scale plant mix simulation (after the German
rolling flask method); modulated differential scanning calorimetry
to predict low-temperature properties; fast ion exchange chromatography;
asphalt aging using a microwave oven; non-aqueous potentiometric titration
for acids in asphalt; supercritical fluid extraction of asphalt concrete
cores; a shale oil modified asphalt demonstration site near Jackson,
Wyoming; effects of moisture on rheology and aging of asphalt; ion
exchange chromatography of asphalts using inexpensive resins; precipitation
of waxes from asphalt neutrals; mastics penetration test; fast inverse
gas liquid chromatography to predict long-term aging; multiple size
exclusion chromatography to improve definition of associated materials;
and a sliding plate microviscometer using aggregate plates to examine
asphalt thin film behavior.
This
volume is the second in a series. The other volume is Volume I: Interpretive
Report (FHWA-RD-99-212).
The NTIS publication number for Volume II is PB2001-108760.
An
Introduction to the Deep Mixing Methods as Used in Geotechnical Applications
— Volume III: The Verification and Properties of Treated Ground
Publication No. FHWA-RD-99-167
The Deep Mixing Method (DMM) is an in situ soil treatment technology
whereby the soil is blended with cementitious and/or other materials.
This third report focuses closely on the properties of soils treated
by DMM and aspects of quality control, quality assurance, and verification.
This report expands on the illustrative details previously provided
in Volumes I and II. The engineering properties of treated soils,
as reported in the international technical press, are reviewed together
with the construction parameters and materials used to treat them.
Sources of information include data from routine production tests,
special laboratory and field tests, and more qualitative statements
made in overview by specialists in the DMM technology. Methods of
process control and verification of performance are also discussed
since these are key issues in the minds of current and potential users.
This
volume is the third in a series. The other two volumes (FHWA-RD-99-138,
Volume I, and FHWA-RD-99-144, Volume II) have been published earlier.
The NTIS publication number for Volume III is PB202-100376.
Other Articles in this issue:
"Stone-Walling"
in Arkansas
Arkansas
Combines Best Practices for an Innovative Insterstate Rehabilitation
Program
Small
Investment, Dramatic Dividends — Saving Lives in "Blood
Alley"
National
Review of the Highway Safety Improvement Program
Weather:
A Research Agenda for Surface Transportation Program
Highway
Quality Awards
FHWA
Model Predicts Noise Impacts
Synergy
in Action: FHWA's Transportation Pooled-Fund Program