Daily traffic volume of a highway is 2500, consisting of 30% of trucks and 70% of...

  

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Daily traffic volume of a highway is 2500, consisting of 30% of trucks and 70% of cars. Fig- ure 3 shows the load of each axle of vehicles. The rate of growth of traffic for each vehicle type was estimated as 4.5%. If a pavement is designed for 12 million ESAL, how many years would the pavement last? Consider the "structural number is 4 and serviceability of 2.5" and refer to the following formula for Cumulative standard axle load. Hint: 1 kips = 4.448 KN m A = 365 P₁ [(1 + r)" - 1]/r; i=1 b) If the pavement is to be redesigned for 15 years with the same traffic volume, find the ESAL? c) A pavement is designed with the ESAL of part b) on a sandy clay subgrade. It is required to design subgrade strength with 100% of the maximum dry density achieved in the British Stan- dard (Intermediate level of compaction) compaction test, at about 18% of subgrade moisture con- tent. The design subgrade CBR is 10%. Design traffic class and subgrade strength class to pro- pose suitable "flexible unbound road sections" based on (Road Note 31) RN31 design method(use provided appropriate charts), and give a recommendation with suitable justification. 8.9 kN 00 133.4 kN 8.9 kN 106.8 KN 62.3 kN Figure 3. The loads and axle configurations Daily traffic volume of a highway is 2500, consisting of 30% of trucks and 70% of cars. Fig- ure 3 shows the load of each axle of vehicles. The rate of growth of traffic for each vehicle type was estimated as 4.5%. If a pavement is designed for 12 million ESAL, how many years would the pavement last? Consider the "structural number is 4 and serviceability of 2.5" and refer to the following formula for Cumulative standard axle load. Hint: 1 kips = 4.448 KN m A = 365 P₁ [(1 + r)" - 1]/r; i=1 b) If the pavement is to be redesigned for 15 years with the same traffic volume, find the ESAL? c) A pavement is designed with the ESAL of part b) on a sandy clay subgrade. It is required to design subgrade strength with 100% of the maximum dry density achieved in the British Stan- dard (Intermediate level of compaction) compaction test, at about 18% of subgrade moisture con- tent. The design subgrade CBR is 10%. Design traffic class and subgrade strength class to pro- pose suitable "flexible unbound road sections" based on (Road Note 31) RN31 design method(use provided appropriate charts), and give a recommendation with suitable justification. 8.9 kN 00 133.4 kN 8.9 kN 106.8 KN 62.3 kN Figure 3. The loads and axle configurations

Answer rating: 100% (QA)

To determine how many years the pavement will last we need to calculate the Cumulative Standard Axle Load CAL and compare it to the design life of the pavement a Calculation of Cumulative Standard Axl... View the full answer