Pavement Engineering
HWA provides data and engineering services for the design of Portland cement concrete (PCC), hot mix asphalt (HMA), and permeable pavement systems for arterial, residential, industrial, railway and airport use. Field services include non-destructive pavement evaluation using our in-house, portable Falling Weight Deflectometer (FWD) to assess remaining pavement life, develop data for back calculation of in-situ layer moduli, detect voids and soft subgrade, assess joint load transfer ability of PCC panels, and develop data for pavement management, reconstruction, and overlay design. Laboratory services include, but are not limited to, soil classifications (ASTM and AASHTO), Resilient Modulus (MR), and CBR determinations.
HWA also uses Dropweight Cone Penetrometer (DCP) testing to evaluate the strength of pavement structure layers and our in-house pavement coring equipment and utility van that is customized for pavement coring can perform cores ranging from 1.5-inch to 6-inch diameter through asphalt and concrete pavements allowing us to provide thorough and efficient pavement analyses.
Typical Services Include:
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Overlay Design
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Pavement Coring
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New Pavement Design
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Life-Cycle Cost Analysis
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Permeable Pavement Design
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Non-Destructive Testing Using FWD
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Remaining Pavement Life Expectancy
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Input for Pavement Management Systems
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Recommendation for Use of Recycled or Marginal Soils in Pavement Structures
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Assessment of Subgrade Soils Through FWD Testing and Coring/Handhole/DCP Exploration
HWA has applied these services to the following types of projects:
Overlay Design
New Pavement Design
Existing Pavement Evaluation
Identification of Soft Subgrade Conditions and Voids
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Pavement Engineering Projects
Seattle, WA
Renton, WA
Des Moines, WA
SeaTac, WA
Specializing in Non-Destructive Pavement Evaluation
Pavement life expectancy and maintenance requirements are of critical importance to public works directors and airport managers. Paying close attention to pavement condition and applying overlays on a timely basis will prolong pavement life and avoid costly pavement replacements. To best address pavement serviceability concerns, HWA acquired a portable Falling Weight Deflectometer (FWD) to provide in-situ measurements of pavement deflections under varying simulated traffic loads. Combined with measurements of pavement component thicknesses, state-of-the-art mechanistic design computer software allows us to determine subgrade resilient moduli (MR). Given reliable design traffic information for the facility, we can then make reliable estimates of expected pavement life, overlay requirements, and design thickness requirements of new pavement sections.
Specific Services Include
Spring Thaw Evaluations
Pavement Life Predictions
Overlay Requirement Design
Design Thickness Requirements
Falling Weight Deflectometer Surveys
In-Situ Resilient Moduli Determinations
Input for Pavement Management Systems