One pavement structure consisting of 2 pavement layers over subgrade has a required structural number (SN) of 5.60. The layer coefficient for asphalt surface (a₁) is 0.44 and the layer coefficient for the granular base (a2) is 0.14. The drainage modifying factor for the granular base layer is 0.9. If assuming asphalt surface thickness of 6", calculate the thickness of the granular base layer. (Round up to the nearest inch and fill in the blank with a number only.) 5

Please solve this question in step by step- It is transportation-2 Civil engineering My last digit of my registration number =2 Q6. Using the AASHTO flexible pavement design procedure, design (i.e. thicknesses of the different layers) a pavement for a rural interstate highway (i.e. it is a freeway). The expected design ESAL is 8x10 . The pavement structure is to consist of asphalt concrete with a resilient modulus of 400,000 psi (with a corresponding structural layer coefficient of 0.42), a granular base with a resilient modulus of 34,000 psi, and a granular subbase with a resilient modulus of (15,000+ last digit of your Registration No.) psi. The resilient modulus of the subgrade is 7,000 psi. A Structural Number SN, = 5.4 was obtained using a subgrade M, = 7000 psi using the AASHTO 1993 flexible pavement design method. Also, a Structural Number SN, = 4.3 was obtained using a Subbase M, =15000 psi . Finally, a Structural Number SN, = 3.2 was obtained using a Base M, = 34000 psi . It…

A flexible pavement is constructed with 3 inches of hot-mix asphalt (HMA) wearing surface, 6 inches of emulsion/aggregate-bituminous base, and 6 inches of crushed stone subbase. The subgrade has a soil resilient modulus of 8,000 lb/in² , and M2 and M3 are equal to 1.0 for the materials in the pavement structure. The overall standard deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip single axles, 400 24-kip single axles, and 680 40-kip tandem axles. How many years would you estimate this pavement would last (how long before its PSI drops below a TSI of 2.5) if you wanted to be 90% confident that your estimate was not too high, and if you wanted to be 99% confident that your estimate was not too high?

QUESTION 4 Normally, a flexible pavement contains: surface layer+base layer surface layer+subgrade layer surface layer+base layer+subgrade layer base layer+subgrade layer QUESTION 5 The joint spacings of the jointed plain concrete pavement are between O no joint is needed in the JPCP. O 300-700 ft O 30-100 ft 15-30 ft

If pavement and sub grade are considered as two layer system a stiff factor is to be introduced to take into account the different values of modulus of elasticity of the two layers. if the modulus of elasticity of the subgrade is 100 kg/cm2 and the modulus of elasticity of the pavement is 1000kg/cm2, what is the stiffness factor ?

A flexible pavement has a 210 mm hot-mix asphalt “HMA” wearing surface, a 300 mm base (MG-20), and a 500 mm subbase (MG-112). The pavement was designed with 95% reliability, an overall standard deviation So of 0.45, and a APSI of 1.75 (a TSI of 2.5). The drainage coefficient is 0.8 for the base and subbase. The materials properties are as follows: - = Resilient modulus of HMA 2 894 MPa (or 420 000 psi); Resilient modulus of base (MG-20) = 169 MPa (or 24 500 psi); Resilient modulus of subbase (MG-112) = 74 MPa (or 10 700 psi); Effective roadbed soil resilient modulus = 36 MPa (or 5 200 psi). How many 18-kip (80-KN) single-axle loads can be carried before the pavement reaches its TSI (terminal serviceability index).

4- Describe the characteristics and functions of the top layer in a pavement system.

A flexible pavement has hot mix asphalt of 4 inch, crushed stone = 8 inch, CBR =4 Calculate value of x and u.

3. Compute the thickness of a flexible pavement for a wheel load of 50 kN, if the allowable bearing pressure on the base of the pavement is 0.15 MPa and the equivalent diameter of the contact area of the tires is equal to 165 mm.

Design a pavement for a rural interstate highway. The expected design ESAL is 13x106. The pavement structure is to consist of asphalt concrete with an elastic modulus of 400000psi, a granular base with an elastic modulus of 26000psi, and a granular subbase with an elastic modulus of 12000psi. The elastic modulus of the subgrade is 8000psi. It is estimated that it will take a week for water to drain from the pavement and that the pavement will be saturated about 15% of the time. Assume that a reliability level o about 90% is required and that the initial serviceability index is 4.2 and the final serviceability index is 2.5.