General Relativity of Pavement Condition Rating and Its Global Impact
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1 Ministry of Transportation General Relativity of Pavement Condition Rating and Its Global Impact Li Ningyuan Ministry of Transportation of Ontario Ontario, Canada 29th RPUG Meeting Denver, Colorado November 13-16, 2017
2 General Relativity of Pavement Performance Assessment and Its Impact i Ningyuan and Susan Tighe Ministry of Transportation Highlights Pavement Condition Survey and Evaluation Concept of Relativity of Pavement Condition Rating and Its Global Impact Diversity in pavement condition survey and assessment Relativity due to diversity in road condition ratings Issues on diversity and relativity Research and Practical Values of this Study
3 General Relativity of Pavement Performance Assessment and Its Impact i Ningyuan and Susan Tighe Ministry of Transportation Example diversities in pavement condition survey and evaluation Different types of pavement surface distress defined by road agencies Number of pavement surface distresses to be surveyed and used in road condition rating Severity and density of each pavement distress is defined differently Different condition rating scales and categories are used by different road agencies Different condition rating scales and categories are used by different road agencies
4 Pavement Condition Indices Structural Assessment of a pavement section Structural - rutting, strength/deformation, durability/deflection, surface distresses, etc. Measurement direct measures and performance indices (rut depth, potholes, cracks, RDI, PCI/DMI) Functional Assessment of a pavement section Functional comfortability/roughness, safety/friction, environment/noise, etc. Measurement indirect and relative measures (profiles, skid resistance, and noise, etc.) and performance indices (IRI, IFI/FN, db) Overall Assessment of a Pavement Section Combined structural and functional measures subjective rating and performance indices (PSI, PCI, PQI, KPI, etc.)
5 General Relativity of Pavement Performance Assessment and Its Impact
6 Type I - Condition Assessment Index Ministry of Transportation
7 General Relativity of Pavement Performance Assessment and Its Impact Li Ningyuan and Susan Tighe Ministry of Transportation Diversity in Pavement Condition Rating and Condition Index
8 General Relativity of Pavement Performance Assessment and Its Impact Li Ningyuan and Susan Tighe Ministry of Transportation Diversity in Pavement Condition Rating and Its Impact
9 Type II Pavement Condition Indices Ministry of Transportation
10 Pavement Evaluation Data Collection for Structural Assessment Manual and static measures rut, deformation, cracks, deflection/strength Automatic and dynamic measures quantity measures with some limitations (rutting, cracks, etc) Data Collection for Functional Assessment Visual and subjective inspection and evaluation comfortability/roughness, safety/friction, environment/noise, etc. High-speed and automatic process indirect measures (profiles, macro-textures, and noise, etc.) and convert measurement to performance indices (IRI, IFI/FN, db) Data Collection for Overall Assessment Subjective rating for performance evaluation (PCR, PCI, PQI, etc.)
11 Relativity of Pavement Performance Assessment Issues on factors causing diversity and relativity in pavement evaluation No unified measurement (including unit, scale, levels of severity and density of distresses, etc.) No standard data collection device and equipment (varies in precision and accuracy) Not the same data components are used in assessment of overall pavement condition No consistent criteria and methods across region/globe
12 Relativity of Pavement Performance Assessment Impacts of diversity on pavement condition assessment Relativity or absence of standards of absolute and universal applications Making a performance index as dependent variable of road agency/location, and relative to each other given the same value but used in two or more different locations/countries Introduce new concepts: o o Type I performance index (physically measurable index, such as rutting, deflection, cracking length and width, etc.) Type II performance index (subjective and non-measurable index, PCI, PSI, PQI, KPI, which is a function of two or more individual measurable and/or non-measurable indexes) Potential impacts on many other operational components of pavement management, reporting/comparison, etc.
13 Type II Performance Assessment Index
14 Diversity in Pavement Evaluation Contents Flexible Composite Concrete Coarse Aggregate Loss Coarse Aggregate Loss Coarse Aggregate Loss Flushing Flushing Joint Sealant Loss Alligator Cracking Joint Failure Joint Failure Single and Multiple Cracking Single and Multiple Cracking Single and Multiple Cracking Wheel Track Rutting Wheel Track Rutting Transverse Joint Creep Roughness (IRI) Roughness (IRI) Roughness (IRI) Joint Separation Joint Separation Longitudinal Joint Separation Skid Resistance Skid Resistance Skid Resistance
15 General Relativity of Pavement Performance Assessment and Its Impact Li Ningyuan and Susan Tighe Ministry of Transportation Diversity of Pavement Performance Rating Scales and Evaluation Categories
16 General Relativity of Pavement Performance Assessment and Its Impact Li Ningyuan and Susan Tighe Ministry of Transportation Relativity of Pavement Performance Assessment Solution to exploring relationships between diversity and relativity Review all overall or integrated pavement performance assessment indexes used international and explore their relationships by same index and different indexes Make performance index comparable and adjustable through calibration in the global wide o Type I performance index (consistent in scale of range, severity and density of measurement, such as rutting, deflection, cracking length and width, etc. o Type II performance index (consistent in definition and scale of PCI, PSI, PQI, KPI, etc.) Establish international standards for pavement performance assessment, including performance indexes (Type I and Type II), objectives or components of performance evaluation
17 Impacts of Pavement Performance Assessment on M&R Treatment Decisions
18 Impacts on Preservation/Planning Decisions
19 Impacts of Performance Scale and Triggers
20 General Relativity of Pavement Performance Assessment and Its Impact i Ningyuan and Susan Tighe Ministry of Transportation Discussion and Conclusion Diversity in the current road condition survey and rating systems, which has significant impacts on pavement performance assessment Quantify impacts of the diversity in road condition rating and performance index Need to establish uniform pavement condition rating and evaluation methods Theoretical and practical values of this study
21 THANK YOU Li Ningyuan Senior Pavement Management Engineer MTO, Ontario, Canada
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