Pavement Engineering

HWA offers non-destructive pavement evaluation, subgrade assessment and moduli back calculation; in addition to advanced laboratory characterization of subgrade and subbase materials. HWA provides data and engineering services for the design of PCC, HMA and permeable pavement systems for residential, industrial, and airport use.


Field services include: non-destructive pavement evaluation using our Heavy-Weight 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 the joint load transfer ability of PCC panels; and develop data for pavement management, reconstruction, and overlay design. Laboratory services include 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. HWA has in-house pavement coring equipment and can perform cores ranging from 1.5-inch to 6-inch diameter through asphalt and concrete pavements.

Typical Services Include:

Non-destructive testing using FWD

Pavement coring

Assessment of subgrade soils through FWD Testing and coring/handhole/DCP exploration

New pavement design

Overlay design

Life-cycle cost analysis

Permeable pavement design

Recommendation for use of recycled or marginal soils in pavement structures

Remaining pavement life expectancy

Input for pavement management systems


HWA has applied these services to the following types of projects:


Existing pavement evaluation

New pavement design

Overlay design

Identification of soft subgrade conditions and voids

We Specialize in Non-Destructive Pavement Evaluation
Falling Weight Deflectometer (FWD)

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:

􀂃 Falling Weight Deflectometer Surveys
􀂃 In-Situ Resilient Moduli Determinations
􀂃 Pavement Life Predictions
􀂃 Overlay Requirement Design
􀂃 Design Thickness Requirements
􀂃 Input for Pavement Management Systems
􀂃 Spring Thaw Evaluations