The Study of Pavement Smoothness Specification and Indices Conversion Analysis
Date Issued
2010
Date
2010
Author(s)
Chang, Li-Wei
Abstract
This study discusses the difference and relation between 3-M Standard Deviator and International Roughness Index (IRI), and it also provide a suitable conversion method. And the second part discussed the relationship between user experience and roughness indices as a prerequisite for the users comfort. Then, the final part discuses provide a limitation and characteristics of 3-M Straightedge.
The distribution of IRI and 3-M Standard Deviator data are both fit with lognormal distribution, and the regression model is a power function with 0.9368 R2 value. The verification process with the data collected in Taiwan, and it also fit the Gauss-Markov Theorem.
A Pavement Quality Measurement System (PQMS) was using in this study to out the Pavement Riding Quality Index (PRQI), and the test was proceeded in Taoyuan International Airport South Runway. The single-wheeltrack index has low correlation with PRQI, but Half-Car Roughness Index (HRI) and Mean Roughness Index (MRI) has higher R2 values, and the R2 value is 0.85 for HRI, which can represent the user feeling at most.
In calculation of 3-M Standard Deviator, the mean value and passing rate of Average-Range Method overestimates the smoothness situation. The wavelength response is performed by the sinusoid profile simulation, due to the sampling interval of 1.5m is too large, this study performed the wavelength response by 0.25 sampling interval. It is sensitivity in the low end, and the starting point had a significant influence. And the present specification thresholds do not performed IRI-based and 3-M Standard Deviator-based in same level. Converting the thresholds by using the conversion equation, the new thresholds make the passing are nearly equivalent in both specifications. The limitation are compiled in the last paragraph, it is recommended that use the 3-M Straightedge for manhole, bridge, shoulder, and other local roughness.
Subjects
3-M Straightedge
IRI
Smoothness Specification
Type
thesis
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