Overview of the SPS-2 National Experiment
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Overview of the SPS-2 National Experiment
Wednesday April 9, 2014Dover, DE
Jack Springer, P.E. FHWA Highway Research Engineer
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Presentation Overview
Quick Introduction to LTPP Review of SPS-2 Experiment
Purpose National SPS-2 Experimental Design Lay of the Land Today
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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.
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LTPP’s GOAL is…
HOW and WHY
to provide answers to
pavements perform as they do!
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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 on pavement distress and performance.
Determine the effects of specific design features on pavement performance.
Establish a national long-term database to support SHRP’s objectives and to meet the future needs of the highway industry.
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LTPP’s CORE FUNCTIONS
Data Collection and Management Data Analysis Product Development
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Test Sections
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LTPP on the Web
Connect to LTPP website through:Connect to LTPP website through:http://www.fhwa.dot.gov/research/tfhrc/programs/infrastructure/pavements/ltpp/
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LTPP InfoPave
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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)
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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
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National SPS-2 Experimental Design
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National SPS-2 Experimental Design
Primary Site Factors Temperature: Freeze and No-Freeze Precipitation: Wet and Dry Subgrade: Fine Grained and Course
Grained
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National SPS-2 Experimental Design
Subgrade
Climatic Condition
Wet Dry
Freeze No-Freeze Freeze No-Freeze
FineOhio, Kansas (J)
North Carolina (N)
* (R) * (V)
Michigan, Iowa (K) Arkansas (O) North Dakota (S) * (W)
CoarseDelaware (L) *(P)
Nevada,Washington (T)
California (X)
Wisconsin (M) * (Q) Colorado (U) Arizona (Y)* = Cell not filled
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Lay of the Land Today
93 95
9396
94
92
93
93
93
94
96
95
97
00
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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/Solicitation/1336.
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Thank You !
Any Questions?