Pavement Condition Monitoring uses sophisticated equipment to collect digital data about road surface profile, rut depth, slab faulting, pavement strength, and videologging. These data are utilized in pavement design and management, structural adequacy for load limit posting, and planning for the annual highway needs analysis/construction program. This activity is also responsible for updating the Roadway Information System (RIS) resulting from physical changes to the state highway system from annual highway construction and maintenance projects. Key components to the RIS database are Mileage Reference Markers, Roadway Features, Intersection, and Pavement Condition Measurement.
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- Falling Weight Deflectometer - A FWD is designed to determine the strength of the pavement structure. The test vehicle drops a load of 9,000 lbs. on the pavement to simulate one wheel of a legally loaded semi-truck axle. The movement (deflection) caused by the load is recorded by seven deflection sensors located on the test vehicle. The deflection is used to determine the present condition of all layers of the pavement. This information is used to evaluate the types and timing of rehabilitation that may be applied to a pavement to extend its service life.
FWD data is currently collected on Portland Cement Concrete (PCC) Restoration Projects, Asphalt Concrete projects programmed for reconstruction or resurfacing in the next 3 years, thin asphalt highways that may require load limits restrictions in the spring and fall, airport projects, and network level testing.
- Pavement Profiler & Videolog - The SDDOT operates a multifunctional integrated road and pavement data collection vehicle. This system integrated several areas of pavement management data collection into one data collection system vehicle. These areas include: Roadway/Right-of-way Videologging, Pavement Distress Video Surveys, Road Profile Data Collection (Profile, Roughness, Faulting).
The roadway and right-of-way videologging system consists of digital images collected, compressed and stored in the computer disk in real time. The images include a 120 degree composite view of the roadway and right-of-way of the road. The images can be collected and stored at operator selected intervals and synchronized with the distress and sensor data. The digital image files and pavement condition data can be uploaded to a network server hard disk and simultaneously accessed by users on the state network right at their desktop PC.