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Dear G-I Pavements Committee members and friends,
Tomorrow (Friday, April 29th) is the extended abstract deadline for the
GeoCongress 2012 San Francisco event. Please consider submitting an
abstract for the highlighted pavement sessions below. GeoCongress 2012
will provide an historical opportunity for our pavement engineering community
with ASCE's recognizing two of our leaders and their significant
accomplishments. - Erol
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The Geo-Institute Pavements Committee is sponsoring the following three
complementary sessions at the Geo-Institute’s GeoCongress 2012: State
of the Art and Practice in Geotechnical Engineering, which will be held in
Oakland, California on March 25-29, 2012. Note that this event will also
include two State of the Art and Practice presentations; "Flexible
Pavement Analysis and Design-A Half Century of Achievement" by Carl
Monismith, University of California-Berkeley; and "Building and
Maintaining a Sustainable Transportation Infrastructure" by Imad Al-Qadi,
University of Illinois-Urbana/Champaign.
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Call for Abstracts (due April 29, 2011)
(1) Sustainable Features for Pavements (Organizers: Enad Mahmoud
<[log in to unmask]>; Chris Marshall
<[log in to unmask]>). Sustainability in production and
construction of pavements in general and flexible pavements in particular has
become a heightened priority for agencies as they grapple with environmental
stewardship mandates and constrained economic realities. Although asphalt
technologies (e.g., reclaimed asphalt pavement, recycled asphalt shingles, warm
mix asphalt) have arguably received the most attention to date, in addition,
there are also many opportunities to address sustainability through the
geotechnical components of pavements. Examples include full depth
recycling; foam asphalt stabilized base layers; use of fly ash, crushed
Portland cement concrete and other recycled materials in granular layers; new
pavement rehabilitation schemes (e.g., inverted pavements); and others.
Research papers are sought for this session that focus on the state-of-the-art
and practice of material characterization, construction, and/or field control
(QC/QA) for sustainable features in pavements. Papers may summarize the results
of laboratory, field investigations, and/or case studies.
(2) Geotechnical Inputs to Mechanistic-Empirical Pavement Design (Organizers:
Charles Schwartz <[log in to unmask]>; Shadi Saadeh
<[log in to unmask]>). With the adoption of the Mechanistic-Empirical
Pavement Design Guide (MEPDG) by AASHTO in 2008 and the release of the
DARWin-ME software in Spring 2011, there is increased need to understand the
geotechnical inputs to the mechanistic-empirical (M-E) pavement design
procedure and their implications for pavement performance. Geotechnical inputs
to the MEDPG/DARWin-ME design methods include physical (e.g., gradation,
density, plasticity), mechanical (resilient modulus), and hydraulic (e.g.,
soil-water characteristic curve, permeability) material properties for the
unbound pavement layers and subgrade. Environmental inputs (e.g., depth to
groundwater, climate history) are also arguably in the geotechnical domain. The
sensitivity of predicted pavement performance to geotechnical inputs,
especially in comparison with observed field performance, is also an important
issue, which involves evaluation and application of current and new/promising
materials performance tests and their use in the MEPDG. Research papers
are sought for this session that focus on the state-of-the-art and practice of
one or more of the following topics related to pavement surface courses,
unbound aggregate layers, and/or subgrades in M-E design: laboratory
measurement of mechanical properties; laboratory measurement of hydraulic
properties; methods for estimating mechanical and/or hydraulic properties;
calibration of performance models (e.g., unbound rutting); improvements to
performance models; sensitivity of predicted performance to geotechnical
inputs; sensitivity of predicted performance to environmental inputs.
(3) Field Estimation of Stiffness of Subgrades and Unbound Layers (Organizers:
Pavana Vennapusa <[log in to unmask]>; Michael Mooney
<[log in to unmask]>; and Jayhyun Kwon <[log in to unmask]>).
The performance and durability of pavements depend heavily on the support
conditions of the foundation layers. Construction of pavement foundation layers
with adequate support capacities requires use of proper construction methods
and evaluation using proper quality control (QC) and quality assurance (QA)
procedures. Since R.R. Proctor's development of the laboratory Proctor test
method in 1933, a target density criterion has been widely used as a QC/QA
measure in practice. This use of density criteria for QC/QA assumes that an
increase in soil density corresponds to an increase in soil strength and
stiffness. However, many researchers have demonstrated that the relationship
between soil strength and stiffness and soil density is complex and is
influenced by several factors such as soil structure, moisture content, and
differences between laboratory and field compaction (e.g., underlying support
conditions), pore pressures induced during compaction, and others. Strength
(e.g., CBR) or stiffness (e.g., resilient modulus or modulus of subgrade
reaction) properties of the foundation layers are the primary inputs to pavement
design. Realizing the importance of measuring the "true" design
properties of pavement foundation layers in situ, there has been growing
interest among highway agencies over the past decade in evaluating
mechanistic-based in situ QC/QA testing methods. These testing methods include
destructive and nondestructive point test methods as well as more advanced
methods such as roller-integrated continuous compaction control methods that
provide full spatial coverage of compaction measurements. Research papers
are sought for this session that focus on the state-of-the-art and practice of
in situ mechanistic-based testing methods for characterizing pavement
foundation layer properties, factors influencing the mechanistic-based
measurements in situ, practical implications of using such methods for QC/QA,
linking in situ mechanistic measurements to laboratory design-related
measurements, methods to determine in situ mechanistic-based target values, and
performance-based specifications.
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Prospective authors are invited to submit a 200-300 word abstract outlining the
scope of their paper. All abstracts should be submitted via the
GeoCongress 2012 website: http://content.geoinstitute.org/GeoCongress2012.html.
Please include the title of the paper, the authors' names and affiliations, and
an email address for the corresponding author. Abstracts are due April 29, 2011.
Full papers will be expected by July 27, 2011. Please share this information
with your friends and colleagues who may be interested.
Erol Tutumluer, PhD
Professor, Paul F. Kent Endowed Faculty Scholar
Director of International Programs
Civil and Environmental Engineering
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1205 Newmark CE Lab., MC-250
University of Illinois at Urbana-Champaign
205 N. Mathews Ave., Urbana, IL 61801
Voice:(217) 333-8637; Fax:(217) 333-1924
http://cee.illinois.edu/faculty/eroltutumluer
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