streets and local roads concrete pavement design guide · ncdot published a low-volume road design...
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Streets and Local RoadsConcrete Pavement Design Guide
Jay Thompson, P.E.State Pavement Design Engineer
South Carolina DOT
Andy Johnson, Ph.D., P.E.Pavement Design Engineer
Southeast Cement Promotion Association
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Background
CRMCA approached SCDOT and NCDOT to request updated methods for low-volume concrete pavement design around 2010. NCDOT and SCDOT staff agreed that their methodology is
not ideal for low volume roads. CRMCA prepared a streets and local roads design guide and
construction specifications for NCDOT and SCDOT written by a consultant specializing in pavement engineering. The design guide uses PCA design methodology, which is
better suited for low volume roads and is the basis for ACI 330.
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Background
While SCDOT agreed in principle with the design guide changes, we had many detailed concerns with the recommendations.This led to multiple drafts and meetings to address
their concerns.
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Background
NCDOT published a low-volume road design guide for concrete in 2016 on their website.Unlike NCDOT, SCDOT does not accept subdivisions
and new developments into the state system.SCDOT declined to publish because they do not
have a comparable asphalt low volume guide.However, pavement designed by the guide can be
acceptable within the limits of the design method.
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Why can’t SCDOT’s existing design method be used?
SCDOT uses the AASHTO empirical design method. Was developed in the 1950s to prepare for the upcoming interstate
building boom of the 1960s and 1970s. Most of the test pavements used for developing the design method
failed due to pumping at the joints, not fatigue. Not really intended for low-volume roads.
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Why can’t SCDOT’s existing design method be used?
SCDOT working on implementation of new AASHTO mechanistic-empirical design methodology. Addresses many of the weaknesses of previous AASHTO design
method. Has to be designed with AASHTO PavementME software – very
expensive and complex. Still not really intended for low-volume roads.
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What is a low-volume road?
Streets and Local Roads Design Guide has specific limits on when it can be used: Average Daily 2-way Truck Traffic of 200 or less. Maximum slab thickness of 8 inches. Normal mixed traffic, not for industrial or special haul roads.
If these conditions do not apply, a detailed pavement design is required.
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SLR pavement design methodology
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(1951, first edition 1933)
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(1974)
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(2019)
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Slab Thickness
Steel in Slab
Dowels
Concrete Strength
Joint Placement
Subbase
Concrete Pavement - What’s Important?
Drainage
Aggregates
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Concrete Pavement Design
GeometricsThickness(es) JointsMaterials
Four Major Design Areas:
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Concrete Pavement Design
GeometricsThickness(es)JointsMaterials
Most Often Influence Cost& Selection of Projects
COST
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Concrete Pavement Design
GeometricsThickness(es)JointsMaterials
Most Often InfluenceReal-world Performance
PERFORMANCE
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Key design questions
Is a subbase necessary?Are dowels necessary?How thick should the pavement be?How far apart should the joints be?
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Non-erodible subbase material propertiesLess than 15 percent passing the #200 sieve.An in-place density of 95% of AASHTO T99.A Plasticity Index (PI) of 6 or less.A Liquid Limit (LL) of 25 or less.
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Is a subbase necessary?
Exclude subbase if:Non-pumpable subgrade soilExisting soils, when compacted, provide stable
construction platformResidential traffic
Include subbase for other cases
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Slab Thickness Load Transfer
Less than 7.5 inches Dowel bars are not required
7.5 inches or greater 1.00 inch dowel bars required
To dowel or not to dowel
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Key design questions
Is a subbase necessary?Are dowels necessary?How thick should the pavement be?How far apart should the joints be?
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Sorth Carolina Design Examples
Residential Street: Assume 5 trucks per day for 30 years, 2% compound
growth. Soil support conditions are assumed to be “Medium”.Will use 6 inch cement modified subbase. Edge support is present.
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Sorth Carolina Design Examples
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South Carolina Design Examples
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South Carolina Design Examples
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South Carolina Design Examples
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Design Recommendation:5“ Plain Jointed PCC PavementCompressive Strength=4000 psi
No dowels10’ transverse joint spacing6” Soil-Cement Subbase (?)
South Carolina Design Examples
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Collector Road200 trucks per day, 2% annual growth, 30 yearsSubgrade support condition – “Low”No edge support6 inch aggregate base
South Carolina Design Examples
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South Carolina Design Examples
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South Carolina Design Examples
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South Carolina Design Examples
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South Carolina Design Examples
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North Carolina Design Examples
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Design Recommendation:7.5“ Plain Jointed PCC PavementCompressive Strength=4000 psi
1” dowels15’ transverse joint spacing6” Aggregate Base Course
South Carolina Design Examples
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Resources
DOT folks: Contact OMR if you have a low-volume road that might work for concrete.Others: Let the Design Assistance Team know if you
have any questions. Southeast Cement Promotion Association Carolinas Concrete Paving Association Carolinas Ready Mixed Concrete Association
Look at both asphalt and concrete! Remember….when materials compete, owners win……
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Questions?
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