Transcription of AASHTO Pavement Thickness Design Guide
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AASHTO Pavement Thickness Design Guide
AASHTO Pavement Thickness Design Guide When designing Pavement Thickness for flexible and rigid pavements, the following considerations should be used. 1. Performance criteria (serviceability indexes). Condition of pavements are rated with a present serviceability index (PSI) ranging from 5 (perfect condition) to 0 (impossible to travel). a. Initial serviceability index (Po) Po is considered to be that PSI immediately after the Pavement is open. AASHTO values are for rigid Pavement and for flexible Pavement . b. Terminal serviceability index (Pt) Pt is considered to be that PSI that represents the lowest acceptable level before resurfacing or reconstruction becomes necessary. Pt = for Secondary Roads, Local Residential Streets. Pt = for Minor Collectors, Industrial and Commercial Streets. Pt = for Major Collectors and all Arterials. c. Serviceability loss (dPSI) dPSI is the difference between Po and Pt (Po Pt). The dPSI is the basis for the Pavement Design .
Pavement Reinforcement a. General. There are two types of reinforced rigid pavements. Jointed Reinforced Concrete Pavement (JRCP) and Continuously Reinforced Concrete Pavement (CRCP). The major difference is that JRCP has joints and CRCP does not. b. JRCP
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