Overview of the SPS-2 National Experiment

Tuesday July 16, 2013Abilene, KS

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…

HOW and WHY

to provide answers to

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 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.

LTPP’s CORE FUNCTIONS

Data Collection and Management Data Analysis Product Development

Test Sections

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/

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

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

Lay of the Land Today

93 95

9396

94

92

93

93

93

94

96

95

97

00

Lay of the Land Today

13 of 14 Projects are Active Kansas SPS-2 first one constructed 84% (174/206) Section are Active

SPS-2 Pavement Preservation Pooled Fund: http://www.pooledfund.org/Details/Solicitation/1336.

Thank You !

Any Questions?