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Parameter <br />Design Value <br />Notes <br />Design Period ESAL repetitions <br />Compute using rigid pavement <br />factors in PIDSM Table 1. <br />1 <br />Design Reliability Level <br />Same as for flexible pavement <br />Initial Serviceability, Po <br />4.5 <br />2 <br />Terminal Serviceability, Pt <br />Same as for flexible pavement <br />Standard Deviation <br />0.40 <br />3 <br />Minimum 28 -day Flexural Strength of PCC <br />(S'c) <br />600 psi <br />4 <br />Modulus of Elasticity of Concrete (Ec) <br />3,600,000 psi <br />5 <br />Modulus of Elasticity of Base Material <br />20,000 psi <br />6 <br />Modulus of Subgrade Support (k -value) <br />50 pci <br />7 <br />Poisson's Ratio of PCC <br />0.20 <br />8 <br />Edge Support Adjustment Factor <br />1.0 <br />9 <br />Friction Coefficient between Slab and Base <br />1.4 <br />10 <br />Joint Length <br />Per requirements of.PIDSM <br />Mean Annual Wind Speed <br />7.6 mph <br />11 <br />Mean Annual Temperature <br />53.3 °F <br />11 <br />Mean Annual Precipitation <br />49.4 inches <br />11 <br />Moisture Gradient & Construction <br />Temperature Differential in Slab <br />1 °F per inch of slab thickness <br />12 <br />Mean Annual Freezing Index <br />31 °F days <br />13 <br />Annual Temperature Range <br />46.6 °F <br />14 <br />Number of Days with Maximum <br />Temperature above 90 °F <br />15 <br />15 <br />Notes on parameter values: <br />1. See last paragraph on page III -80 of the AASHTO Guide. <br />2. See page 21 in 2007 ODOT Design Guide. <br />3. This is rounded from the value of 0.39 that ODOT uses (see page 22 of the 2007 Design Guide) <br />since the accuracy of estimating the standard deviation doesn't warrant distinction between <br />0.39 and 0.40. <br />4. Based on 600 psi flexural strength requirement in Section 02001.33 of the 2008 ODOT <br />Specification for Class 4000 paving concrete. <br />5. Computed from 600 psi flexural strength using formula: Ec = 26454*S'C0.77 from formula <br />shown in example on page 45 of the 1998 Supplement. <br />6. Value shown is for aggregate base per 2007 ODOT Design Guide. Mid-range values from Table <br />14 of the 1998 Supplement would also be acceptable. <br />7. Derived from Fig. 40 in AASHTO 1998 Supplement for A-4 to A-7 soils at 95% saturation to <br />approximate the default R value of 5 used for flexible pavement. Exception: If soil testing is <br />performed to determine the actual k -value, the actual k -value may be used. Submit testing <br />reports to the City for review. <br />8. From AASHTO 1998 Supplement <br />9. Assumes no slab edge support. Factor varies from 0.92 to 1.00 depending upon degree of <br />edge support as noted on page 20 of 1998 Supplement. <br />10. Mean value from Table 14 in 1998 Supplement for aggregate base. <br />11. Used to compute temperature differential within the slab per Eq 48 of 1998 Supplement for <br />positive differential and Eq 51 for negative temperature differential. Data is from the National <br />Public Improvement Design Standards Manual, 2016 Page 2-35 <br />