Transcript LTPP forensic study
Overview of the SPS-2 National Experiment Wednesday April 9, 2014 Dover, DE
Jack Springer, P.E.
FHWA Highway Research Engineer
Presentation Overview
Quick Introduction to LTPP
Review of SPS-2 Experiment
Purpose
National SPS-2 Experimental Design
Lay of the Land Today
LTPP Mission Statement
To increase pavement life by investigation of various designs of pavement structures and rehabilitated pavement structures, using different materials and under different loads, environments, subgrade soil, and maintenance practices.
LTPP’s GOAL is…
to provide answers to
HOW
and
WHY
pavements perform as they do!
LTPP Objectives
Evaluate existing
design methods
.
Develop improved design methodologies and strategies for the
rehabilitation
of existing pavements.
Develop improved design equations for
new and reconstructed
pavements.
Determine the effects of
loading
,
environment
,
material properties
and
variability
,
construction quality
, and
maintenance levels
performance.
on pavement distress and Determine the effects of
specific design features
pavement performance.
on Establish a
national long-term database
to support SHRP’s objectives and to meet the future needs of the highway industry.
LTPP’s CORE FUNCTIONS
Data Collection and Management
Data Analysis
Product Development
Test Sections
LTPP Data & Information Climate Load Structure Distress Materials Response
3
LTPP on the Web
Connect to LTPP website through:
http://www.fhwa.dot.gov/research/tfhrc/pr ograms/infrastructure/pavements/ltpp/
LTPP InfoPave
SPS-2 Purpose
Determine the influence of concrete strength and pavement drainage on PCC pavement performance Neither had quality experimental field data Find impact of widened lanes Determine impact of other design factors (slab thickness, base type)
SPS-2 Purpose (cont.)
Planned products Evaluation of existing design methods Development of improved design equations New and reconstructed pavements Effects of specific design features on pavement performance Development of a comprehensive database for pavement community
National SPS-2 Experimental Design
National SPS-2 Experimental Design
Primary Site Factors Temperature: Freeze and No-Freeze Precipitation: Wet and Dry Subgrade: Fine Grained and Course Grained
National SPS-2 Experimental Design Climatic Condition Subgrade Fine Coarse
Freeze Ohio, Kansas (J) Wet No-Freeze North Carolina (N) Michigan, Iowa (K) Arkansas (O) Delaware (L) Wisconsin (M) * = Cell not filled *(P) * (Q) * (R) Freeze Dry No-Freeze * (V) North Dakota (S) * (W) Nevada, Washington (T) California (X) Colorado (U) Arizona (Y)
Lay of the Land Today
95 00 93 93 93 94 92 94 97 93 96 95 93 96
Lay of the Land Today
13 of 14 Projects are Active Delaware SPS-2 still active!
84% (174/206) Sections are Active SPS-2 Pavement Preservation Pooled Fund: http://www.pooledfund.org/Details/Solicit ation/1336.
Thank You !
Any Questions?