This chapter will address the functional and structural condition of gravel roads and forest roads. A range of functional problems such as potholes and washboarding will be discussed, their specifications, if any, and any current and future survey and monitoring techniques.
7.1. General
A short discussion about condition specifications for gravel roads and for forest roads and how they differ.
7.2. Functional condition
7.2.1. Road roughness
- specifications: deepest allowed pothole depths, etc.
- techniques: 3d accelerometer, bump integrator, laser scanner
7.2.2. Rutting surveys
-laser scanner, straight edge.
7.2.3. Crossfall
-accelerometer, others
7.2.4. Dusting
-visual technique, video, laser scanner….
7.3. Structural condition
7.3.1. Road structures
-GPR applications, DCP test, drilling and sampling, lab testing
7.3.2. Moisture content, moisture susceptibility
-monitoring stations, GPR applications, sampling and lab testing
7.3.3. Bearing capacity
-Deflection surveys, FWD and data analysis
7.4. Special issues
-Winter maintenance condition
-Monitoring spring thaw