AASHTO R 36:2021 Standard Practice for Evaluating Faulting of Concrete Pavements

AASHTO R 36:2021 Standard Practice for Evaluating Faulting of Concrete Pavements.
5.2.4. For project-level survey, the sampling interval needs to be 19 mm (0.75 in.) or less. No digital filtering during postprocessing of data shall be allowed. Automated triggering is recommended to locate the start and end of survey sections with high precision.
5.2.5. For network-level surveys, the sampling interval needs to be 38 mm (1.5 in.) or less. No digital filtering during postprocessing of data shall be allowed.
5.2.6. Profile data should be collected for both left and right wheel paths.
5.2.7. Observation should be recorded for profiler sensor footprint, aggressive surface textures, lining, slope/grade, spalling, curl/warp, skewed joints, and sealant-filled joints.
5.3. Users can elect either Method A (see Section 6) or Method B (see Section 7) or Mcthod C (see Section 8) to process the HSIP data to compute faulting.
6. METHOD A—PROCESS OF AUTOMATED MEASUREMENTS
6.1. The data processing and reporting should comply with the following best practices for identifying locations of joints/cracks and computing faults. Method A consists of a two-step process. Firstly, joint/crack locations are identified, then an algorithm is used to compute faulting for each joint/crack location.
Note 2—The AFM module in the FHWA ProVAL software (www.RoadProfile.com) is recommended for data processing and reporting, to ensure consistent results based on Method A (see Section 11.2).
6.2. Identify joint/crack locations using an automated method: downward spike detection, step detection, and curled edge detection (see Figure 3).
6.2.1.3. Detect the locations where the spike profile values exceed a threshold value (the starting threshold is —4.0). but avoid multiple hits within a clearance width. 0.5 rn (1.64 ft).
6.2.1.4. Screen the above locations to differentiate joints from cracks.
6.2.2. Use the step detection method when faulting is noticeable on profiles. (See Section 11.4.)
6.2.2.1. Deduct profile elevations between consecutive data points resulting in elevation differences.
6.2.2.2. Detect the locations where the absolute values of the elevation differences exceed a threshold value (the starting threshold value is 2.032 mm or 0.08 in.) but avoid multiple hits within a clearance width of 0.91 rn (3 ft).AASHTO R 36 pdf download.