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5837-2 - Pavement Serviceability Present Serviceability...

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Pavement Serviceability Present Serviceability Rating (PSR) & Present Serviceability Index (PSI) How would you rate this pavement? Is it a 1 out of 5, or 0.5 out of 5?
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How would you rate this pavement? (The pavement has extensive cracking, but the ride quality is not too bad.) This rigid pavement has extensive cracking. How would you rate this as compared with the last one?
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Before the AASHO Road Test (1955-1962), we did not have a standard way of rating pavement. In order to be able to analyze the test results, the serviceability performance concept was developed during the AASHO Road Test.
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The mean value of the individual ratings is termed the Present Serviceability Rating (PSR) Rating scale used :
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Physical Measurements made on the rated pavements: (1) Slope variance (SV) SV = G (S i - ÿ ) 2 / (n-1) where S i = slope ÿ = mean slope (2) Rut depth (RD) (3) Cracking & Patching (C+P) (in ft 2 /1000 ft 2 of class 2 (>1/8”) & class 3 (> ¼ “)cracking) Relationship between PSR & Physical Measurements For Flexible Pavements: PSR = 5.03 – 1.91 log 10 (1 + SV) – 1.38 RD 2 – 0.01 (C+P) 0.5 + error For Rigid Pavements: PSR = 5.41 – 1.80 log 10 (1+SV) – 0.09 (C+P) 0.5 + error The PSR estimated from objective physical measurements are termed PSI (Present Serviceability Index).
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The performance of a pavement is the serviceability over the pavement’s entire life.
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