The CBR for a given subgrade soil at a pavement project is 10. The modulus of resilience of subgrade in (psi) according to AASHTO is about:
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- Given: Design ESAL = 5 x 106 Initial serviceability index = 3.5 Terminal serviceability = 2.5 Standard deviation = 0.5 Reliable = 90%Problem 1: A flexible pavement section is designed using a CBR of 20 for the subgrade. During construction it is found that the subgrade is softer with a CBR of 7. The contractor proposes to place a layer of select fill on top of the subgrade to compensate for this condition. How thick should the select fill layer be if the original pavement section is 8 inches HMA over 12 inches crushed aggregate base over subgrade. Assume a resilient modulus of 15,000 psi for the select fill and clearly describe the design method used to solve this problem as well as any assumptions and results PROBLEM 2: Design a rigid pavement that will last as long as the flexible structure from problem 1Pavement Design and Analysis - Design a HMA pavement structure for a 6-lane divided urban highway using the AASHTO method to accommodate the traffic loads and conditions as follows. Give two alternative layer thickness combinations.
- B. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million lb/in², 600 lb/in² modulus of rupture, 150 lb/in³ modulus of subgrade reaction, a 2.8 load transfer coefficient, initial PSI of 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.8 is designed. The pavement's design life is 20 years. The three-lane road is built for vehicles with one 20,000-pound single axle, one 26,000-pound tandem axle, and one 34,000-pound triple axle. Calculate the projected daily truck traffic on the three lanes.New flexible pavement is designed based on the following condition, use the design chart:B. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million Ib/in?, 600 lb/in? modulus of rupture, 150 lb/in³ modulus of subgrade reaction, a 2.8 load transfer coefficient, initial PSI of 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.8 is designed. The pavement's design life is 20 years. The three-lane road is built for vehicles with one 20,000-pound single axle, one 26,000-pound tandem axle, and one 34,000-pound triple axle. Calculate the projected daily truck traffic on the three lanes
- Question -If a particular pavement fails with 98 number of repetitions of 4500 kg load and the same pavement fails with W number of repetitions of load 2855 . Then vale of N isQ6: Designing a Rigid Pavement Using the AASHTO Method (Find D) Effective modulus of subgrade reaction, k = 480 lb/in³ Mean concrete modulus of rupture, Sc = 725 lb/in² Load transfer coefficient, J = 3.9 Ec = 4500000 Drainage coefficient, Ca = 1.0 Design serviceability loss, APSI = 1.5 ZR (Standard normal deviation) = -1.282 Overall standard deviation, So = 0.4 Cumulative 18 kip ESAL = (37900000)Example 7. What is the spacing between contraction joints for 4.0 m slab width having thickness of 20 cm and f = 1.5 for the RCC pavement having 1.0 cm bar dia at 0.30 in spacing? (take ost = 1400 kg/cm² and Yc = 2400 kg/m²)
- CEThe traffic on the design lane of a proposed four-lane rural interstate highway consists of 25% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1885, pi = 4.2. Growth rate = 6.5% %3D SN, Design life = 20 yrs Reliability level = 95% Standard deviation = 0.45 Surface course DI %3D SN2 %3D D2 %3D SN3 Base course Subbase course D3 Roadbed course The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase courses are 70 and 22, respectively, and Mr for the asphalt mixture, 3102 MPa (450,000 lb/in?).Problem 31: Compute the pavement thickness by expansion pressure method if the expansion pressure is 0.160 kg/cm? and the average pavement density is 0.0030 kg/cm?.