Pavement or surface layer sensors are installed on, embedded within, or placed immediately under the hot-mix asphalt or concrete layer of a pavement structure. The sensors are linked by fiber optics to MnROAD's computerized data collection system and the data is stored in a database at MnDOT Materials Research and Engineering Laboratory in Maplewood.
There are two categories of pavement sensor:
Traffic load response: Sensors that measure the response resulting from dynamic forces applied by traffic.
Environmental: Sensors that measure the response of slower changing forces like temperature, moisture and frost depth, material expansion/contraction, shrinkage and creep.
All sensors are designated by a two-letter code. Specification and performance history for an individual sensor type is available upon request.
Environmental Effect Sensors
Displacent of Layered Surface
Electrical Conductivity [soil]
- IV - Reference Rods
- RP - Resistivity Probe
- PL/PT - State Soil Pressure Cell
Environmental Concrete Strain
Water Table Level