Table 6. Comparison between design methods. Design Methods CDOT PCA ICT Application UTW/TWT UTW/TWT UTW UTW Traffic Load spectrum ESAL Load spectrum ESAL Temperature dependency Not considered Not considered Not considered Not considered of HMA modulus Negative, no guidance Negative, -1.4 °F/in Critical temperature Positive, -1 to 5 °F/in based Positive, no guidance in in determining this for Illinois on difference considered on CDOT test measurements determining this input input equivalent damage 20 percent increase of flexural strength due to use of Fiber Not considered Not considered Not considered structural fiber extending the fatigue life of PCC Minimum HMA N.A. N.A. 2.5-3 2.5 thickness, in Location of critical Edge Center/Edge Corner Corner loading Location of critical stress Bottom of PCC Bottom of PCC Top of PCC Top of PCC in PCC Location of critical stress HMA not Bottom of HMA Unknown Bottom of HMA in HMA considered
Table 6. Comparison between design methods. Design Methods CDOT PCA ICT Application UTW/TWT UTW/TWT UTW UTW Traffic Load spectrum ESAL Load spectrum ESAL Temperature dependency of HMA modulus Not considered Not considered Not considered Not considered Critical temperature difference considered Positive, -1 to 5 °F/in based on CDOT test measurements Positive, no guidance in determining this input Negative, no guidance in determining this input Negative, -1.4 °F/in for Illinois on equivalent damage Fiber Not considered Not considered Not considered 20 percent increase of flexural strength due to use of structural fiber extending the fatigue life of PCC Minimum HMA thickness, in N.A. N.A. 2.5-3 2.5 Location of critical loading Edge Center/Edge Corner Corner Location of critical stress in PCC Bottom of PCC Bottom of PCC Top of PCC Top of PCC Location of critical stress in HMA Bottom of HMA Unknown Bottom of HMA HMA not considered
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