Overview of the SPS-2 National Experiment

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Overview of the SPS-2 National Experiment

• Wednesday April 9, 2014
• Dover, 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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LTPPs GOAL is
to provide answers to

• HOW and WHY

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 SHRPs objectives and to meet the future
  needs of the highway industry.

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LTPPs 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
http//www.fhwa.dot.gov/research/tfhrc/programs/in
frastructure/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 Climatic Condition Climatic Condition Climatic Condition
Subgrade Wet Wet Dry Dry
Subgrade Freeze No-Freeze Freeze No-Freeze
Fine Ohio, Kansas (J) North Carolina (N) (R) (V)
Fine Michigan, Iowa (K) Arkansas (O) North Dakota (S) (W)
Coarse Delaware (L) (P) Nevada,Washington (T) California (X)
Coarse Wisconsin (M) (Q) Colorado (U) Arizona (Y)
Cell not filled
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Lay of the Land Today
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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/133
  6.

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Thank You !
Any Questions?