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Present serviceability index

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Present Serviceability Index (PSI) is a pavement performance measure. Introduced by AASHTO, the PSI is one of the most widely used pavement performance indicators after PCI and IRI.[1][2] This performance indicator ranges between 0 and 5, 0 representing a failed pavement and 5 an excellent one. Since the PSI entails slope variance, it is correlated with performance indicators related to roughness such as IRI.[3]

History

The PSI was developed based on AASHO Road Test Present Serviceability Rating (PSR). AASHO Road Test was a set of experiments carried out by the American Association of State Highway and Transportation Officials (AASHTO) from 1956 to 1961.[4] Unlike the PSR, which was a ride quality rating that required a panel of observers to ride in a car over the pavement of interest, the PSI does not require a panel of experts. Therefore, it was a more practical approach for large-scale pavement networks.

Calculation

Present serviceability is a function of several variables. For flexible pavement these variables include:[5]

  • Slope variance (SV)
  • Depth of rut (RD)
  • Cracking and patching (C+P)

References

  1. ^ Piryonesi, S. M.; El-Diraby, T. E. (2020) [Published online: December 21, 2019]. "Data Analytics in Asset Management: Cost-Effective Prediction of the Pavement Condition Index". Journal of Infrastructure Systems. 26 (1): 04019036. doi:10.1061/(ASCE)IS.1943-555X.0000512.
  2. ^ "Piryonesi, S. M. (2019). The Application of Data Analytics to Asset Management: Deterioration and Climate Change Adaptation in Ontario Roads (Doctoral dissertation)".
  3. ^ Hall, Kathleen; Muñoz, Carlos (1999-01-01). "Estimation of Present Serviceability Index from International Roughness Index:". Transportation Research Record. doi:10.3141/1655-13.
  4. ^ "Transportation Research Board (2007). Pavement Lessons Learned from the AASHO Road Test and Performance of the Interstate Highway System, Washington DC" (PDF).{{cite web}}: CS1 maint: url-status (link)
  5. ^ "Cary, W. N. (1960). The pavement serviceability-performance concept. AASHO Road Test" (PDF).{{cite web}}: CS1 maint: url-status (link)
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