Standard Definitions for Common Types of Pavement Cracking (2020) / Chapter Skim
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Standard Definitions for Common Types of Pavement Cracking 37 C H A P T E R 5 Proposed Standard Definitions for Common Cracking Types Introduction Manual surveys based on the ability of human surveyors are to subjectively recognize distresses by identifying crack patterns in various locations on pavement surfaces. Automated technologies rely on high-resolution pavement visual data collected in 2D and 3D formats and process the data for cracking characterization using special software tools.
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Standard Definitions for Common Types of Pavement Cracking 38 pumping. As a result, numerous studies have shown that automated crack classification and quantification results usually have poor correlation with manual survey results (McQueen and Timm 2005, Albitres et al.
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Standard Definitions for Common Types of Pavement Cracking 39 required. Additional research is needed to further evaluate how crack width can be used to define crack severity levels.
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From page 47... ...
Standard Definitions for Common Types of Pavement Cracking 40 Crack orientation: the angular measurement in degrees between the direction of travel and a line drawn between the crack termini as measured within the measurement zone of interest. Crack width: the average gap in inches (mm)
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Standard Definitions for Common Types of Pavement Cracking 41 median zone. The proposed 10 in.
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Standard Definitions for Common Types of Pavement Cracking 42 Figure 17 Sensitivity of cracking percent at Level 3 to grid size. Level 2: Cracking Width for Severity The majority of SHAs use crack width to define the severity levels.
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Standard Definitions for Common Types of Pavement Cracking 43 Wheel path crack: any crack at least 12 in.
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Standard Definitions for Common Types of Pavement Cracking 44 Concrete Pavements It is recommended that Levels 3 and Level 2 cracking definitions for asphalt pavements are directly used for concrete pavements without the consideration of wheel path definitions. Similar to the grid patterns for asphalt pavements shown in Figure 16, the grid generation for concrete pavements starts at mid-lane and propagates to both lane markings.
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Standard Definitions for Common Types of Pavement Cracking 45 MEPDG calibration: percent of transverse cracked slabs. PMS: the severity, extent, cracking percentage, and percent of slabs for all the defined cracks will be used for PMS.
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From page 53... ...
Standard Definitions for Common Types of Pavement Cracking 46 methods. Some definitions in AASHTO R85 (AASHTO 2018)
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