Terminal serviceability index

initial design serviceability index, po, and the design terminal serviceability index, total traffic expressed in ESALs, terminal serviceability and environment. 1 Apr 2015 SN = Structural Number. ∆PSI = Serviceability Index. M. R 2.5 (Terminal Serviceability). ∆PSI = 2.0 (Serviceability Index). ( ). (. ) (. ) ( ) 07.8 log.

4) Initial Serviceability Index (p i) is the Present Serviceability Index (PSI) of the pavement immediately after construction. 5) Terminal Serviceability Index (p t) is the PSI when the pavement is considered to have exhausted its serviceable life. 6) Change in Serviceability (ΔPSI) is the difference in PSI between the 201.2 Terminal Serviceability Terminal serviceability is the minimum level of serviceability the agency allows in design. Once built, pavements may or may not actually degrade to that level but the design terminal serviceability remains the same. ODOT pavements are designed for a minimum PSI (terminal serviceability) of 2.5. Figure 201-1 shows terminal serviceability. 201.3 Design Serviceability Loss = difference between the initial design serviceability index (p. i) and the design terminal serviceability index (p. t) M. R = resilient modulus of the subgrade (psi) log. 10. 𝑊. 18 = 𝑍. 𝑅 × 𝑆. 0 +9.36 × log. 10. 𝑆𝑆+ 1 −0.20 + log. 10 ∆𝑃𝑃𝑆 4.2 −1.5 0.4 + 1094 𝑆𝑆+ 1. 5.19 + 2.32 × log. 10. 𝑀. 𝑅 −8.07 TABLE 4. 1 - Terminal Serviceability Index for Lexington-Fayette County Roadway Classifications.. 3 TABLE 4. 2 - Minimum Thickness Standards for Granular Base and Pavement Courses .. 6 TABLE 4. 3 - Equivalent Single Axle Loads for Residential Streets.. 10 TABLE 4. 4 - 20-Year ESALs for Various Industrial and Commercial Developments ΔPSI=difference between the initial design serviceability index, p o, and the design terminal serviceability index, p t. M R =resilient modulus (psi) a i =ith layer coefficient. D i =ith layer thickness (in.) m i =ith layer drainage coefficient. The design equations for concrete pavements include:

The terminal serviceability index p t is defined as the lowest serviceability that will be tolerated before rehabilitation or reconstruction becomes necessary. A terminal serviceability index of 2.5 or higher is recommended for design of major highways.

The present serviceability index (PSI) is based on the original AASHO Road Test Such information was useful in selecting a “terminal” (or failure) serviceability  ΔPSI, equals, difference between the initial design serviceability index, po, and the design terminal serviceability index, pt. MR, equals, subgrade resilient  A terminal serviceability index of 2.5 or higher is recommended for design of major highways. Thus, a typical allowable serviceability loss due to traffic for flexible  This terminal PSI allows an agency to define what is the anticipated PSI when a road is rebuilt or rehabilitated. New York State Department of Transportation uses   23 Nov 2013 prediction ∆PSI = difference between initial and terminal serviceability index MR = resilient modulus (psi) SN = structural number (AASHTO,  The terminal serviceability index is a value set by the design engineer. The serviceability index which is achieved after overlay construction is related to the.

Terminal Serviceability is the value, within the Present Serviceability Index (PSI), an agency uses as their serviceability level. The index ranges from 0 (dead) to 5 (perfect).

The present serviceability index (PSI) is based on the original AASHO Road Test PSR. Basically, the PSR was a ride quality rating that required a panel of observers to actually ride in an automobile over the pavement in question. Since this type of rating is not practical for large-scale pavement networks, a transition to a non-panel based system was needed.

ΔPSI=difference between the initial design serviceability index, p o, and the design terminal serviceability index, p t. M R =resilient modulus (psi) a i =ith layer coefficient. D i =ith layer thickness (in.) m i =ith layer drainage coefficient. The design equations for concrete pavements include:

o404-LVT asphalt content is 6.2 to 6.4% depending on aggregate type o448 asphalt content typically 5.8%. •binder content can be adjusted as needed, contractor gets paid for what is directed or used. 404-LVT Material Characteristics. •Low volume traffic < 2500 ADT •Where a 1 in. thick surface course can be placed. Maximum Serviceability Loss ∆PSImax = f (frost depth, drainage) (AASHTO, 1993) Effect of Swelling on Performance PSI = Pavement Servicability Index 1 < PSI < 5 “Failure”: PSI < 2+ (AASHTO, 1993) 27 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

specific Present Serviceability Index (PSI) loss than occur in reality. Based on number of axle load applications to a terminal serviceability index. log p =.

UDOT uses a terminal serviceability index (pt) of 2.5 for all roads. The input required to the AASHTO flexible pavement thickness design procedure is. ∆ PSI = po-pt. 1 Serviceability Index -- Design Loss,. Initial, and Terminal ------------------- 10. 2. AASHTO - Suggested Reliability Levels --- 14. 3. Programmed Layer Thickness  serviceability. (Terminal. Serviceability). Present Serviceability Index uses a rating scale of 0 to 5, with. 5 indicating the highest level of acceptability to the user.

The lowest serviceability motorists can tolerate, before rehabilitation, resurfacing or reconstruction,is called terminal serviceability (P t). Common values for terminal serviceability index are P t=2.5 or higher when used for the design of major highways and P t=2.0 when used for low volume roads.The minimum level of serviceability is mostly Pavement managers strive to keep the minimum “terminal” serviceability index at a level that will not be indicative of a public safety hazard or discomfort or be excessively costly in rehabilitative effort. Terminal Serviceability is the value, within the Present Serviceability Index (PSI), an agency uses as their serviceability level. The index ranges from 0 (dead) to 5 (perfect). Structural Number (an index that is indicative of the total pavement thickness required) equals: a 1 D 1 + a 2 D 2 m 2 + a 3 D 3 m 3 +…a i = ithlayer coefficientD i = i th layer thickness (inches)m i = i th layer drainage coefficient: ΔPSI: equals: difference between the initial design serviceability index, po, and the design terminal serviceability index, pt: M R: equals Terminal serviceability index (Pt) – Pt is considered to be that PSI that represents the lowest acceptable level before resurfacing or reconstruction becomes necessary. • Pt = 2.00 for Secondary Roads, Local Residential Streets. Terminal Serviceability is the value, within the Present Serviceability Index (PSI), an agency uses as their serviceability level. The index ranges from 0 (dead) to 5 (perfect).