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14 <br />Rating pavement surface condition <br />With an understanding of surface <br />distress, you can evaluate and rate <br />asphalt pavement surfaces. The rating <br />scale ranges from 10—excellent <br />condition to 1—failed. Most pave- <br />ments will deteriorate through the <br />phases listed in the rating scale. The <br />time it takes to go from excellent <br />condition (10) to complete failure (1) <br />depends largely on the quality of the <br />original construction and the amount <br />of heavy traffic loading. <br />Z RATING O <br />p Excellent <br />h- <br />� RATING]. <br />Z Good <br />O <br />u <br />Z RATING3 <br />W Fair <br />� <br />w <br />� RATING2 <br />aPoor <br />In addition to indicatiny the <br />surface condition of a road, <br />a given rating also includes a <br />recommendation for needed <br />maintenance or repair. This <br />feature of the rating system <br />facilitates its use and enhances <br />its value as a tool in ongoing <br />road maintenance. <br />Once significant deterioration begins, <br />it is common to see pavement decline <br />rapidly. This is usually due to a combi- <br />nation of loading and the effects of <br />additional moisture. As a pavement <br />ages and additional cracking develops, <br />more moisture can enter the pave- <br />ment and accelerate the rate of <br />deterioration. <br />Look at the photographs in this <br />section to become familiar with the <br />descriptions of the individual rating <br />categories. To evaluate an individual <br />pavement segment, first determine its <br />general condition. Is it relatively new, <br />toward the top end of the scale? <br />in very poor condition and at the <br />bottom of the scale? Or somewhere <br />in between? Next, think generally <br />about the appropriate maintenance <br />method. Use the rating categories <br />outlined below. <br />Finally, review the individual <br />pavement distress and select the <br />appropriate surface rating. individual <br />pavements will not have all of the <br />types of distress listed for any <br />particular rating. They may have <br />only one or two types. <br />PAVEMENT AGE -� <br />RATINGS ARE RELATED TO NEEDED MAINTENANCE OR REPAIR <br />Rating Q No maintenance required <br />Rating 10 Little or no maintenance <br />Rating 10 Routine maintenance, cracksealing and minor patching <br />Rating 15 Preservative treatments (sealcoating) <br />Rating 30 Structural improvement and leveling (overlay or recycling) <br />_ _ _ . _ _ _ _ _ __ _ _ _ . _ _ <br />Rating 25 Reconstruction <br />_ _._ _ _ _ _ _ _ _ . _ _ _ _ <br />