Design chart nomograph for RIGID PAVEMENT Concrete Elastic Modulus, E. (105 psi) 0- TL 10 TL 1200- 20 - 1100 o'u 30 - 1000- coefficient, J Load transfer 900 3.0 / 4 800 of rupture, S' (psi) 50 - Concrete modulus 2.2- Drainage coefficient, Ca 6 70d 60 - 600- 70 Match line 80 800 400 200 100 50 20 10 500- Effective modulus of subgrade 90 - reaction, k (pci) Example: 100 k = 72 pci So = 0.29 Ec = 5 x 10 psi R = 95% (ZR = -1.645) S' = 650 psi APSI = 4.2 - 2.5 = 1.7 1 = 3.2 W18 = 5.1 x 10' (18-kip ESAL) Ca = 1.0 Solution: D = 10.0 inches (nearest half-inch, from segment 2) Figure 4.7 Segment 1 of the design chart for rigid pavement based on using mean values for each input variable. Fig 4.8 below.Design slab thickness, D (inches) 14 12 11 10 9 8 7 6 5 Match line Design serviceability loss, APSI 1.0 - 2.0 3.0 Estimated total 18-kip equivalent single-axle load (ESAL) applications. Wig (millions) 100 1000 500 100 50 10 5 1.0 .5 .1 .05 Note: Application of reliability chart requires the use of mean values for all the input variables. Overall standard deviation, So 99.9 99 90 80 70 60 50 Reliability, R (%)PAVEMENT SYSTEM DESIGN: RIGID PAVEMENTS Highway is to be designed with rigid pavement 1- USING the Design chart nomograph Determine the required slab thickness D = PCC slab thickness in inches o Whatis a NOMOGRAPH? is a diagram representing the relations between three or more variable quantities by means of a number of scales, so arranged that the value of one variable can be found by a simple geometric construction, for example, by drawing a straight line intersecting the other scales at the appropriate values. 2- After getting the thickness of the slab \"D'' use the equation below to check your value from the nomograph. __ Hint: Just substitute for all the valued at the below equation. and make sure the right 1s equal to the left hand side t the equation. b B 25 % 7-35[10g10(D+ -606+ log,,[APSI/3.0] 1+|1.624>