Pavement Structural Assessment
Roads are generally designed and built based on strength characteristics or load capacity, but more often than not managed by their surface condition, as strength has been traditionally awkward and expensive to measure. Generally assessing the surface functionality is sufficient, as when the road is rough the pavement tends to be weak, and when the road is smooth the pavement tends to be strong. However, the inverse can also be true. This is where having a complete dataset, comprising the condition of the pavement above and below the surface, enables the road asset manager to exploit a comprehensive dataset, enriching and improving the decisions made to manage their road network.
ARRB’s iPAVe has been fitted with the Hawkeye suite of survey equipment, making it the first fully integrated road surface and sub-surface condition assessment system in the world. The data from the Hawkeye iPAVe is becoming the ‘must have’ data set to manage road networks effectively, with numerous systems being utilized used in North America, Europe, South Africa, China, and Australia and New Zealand, to annually collect millions of deflection basins along with traditional surface condition measures.
What is the Traffic Speed Deflectometer (TSD)?
The TSD uses Doppler lasers to monitor the response of a pavement to the application of a rolling load at highway speeds. TSD data provides continuous pavement deflection profiles, from which bearing capacity indices can be derived and pavement fatigue can be estimated. The high accuracy and resolution of the TSD data enables engineers to pinpoint areas where the pavement structure may be subject to failure. ARRB owns and operates two (soon to be three) of the eleven TSDs in the world, including the only one in North America.
The Hawkeye iPAVe is a fully integrated survey vehicle, that is not only capable of scanning the bearing capacity of a road network at traffic speeds, can also collect synchronized information on pavement roughness, rutting, texture, cracking , road geometry and 3D pavement imaging. In addition imaging can also be collected to monitor the condition of roadside assets such as signs, guardrails, medians, etc. Further development is currently underway to interface Ground Penetrating Radar (GPR).
For further information on how the iPAVe can assist you in managing your road network, or to request a presentation on the Hawkeye iPAVe, please contact the Exton office.