Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 18, Problem 14P
To determine
An appropriate asphalt binder for a reliability of 98 percent.
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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…
To select an asphalt binder for a specific location, the mean seven-day maximum pavement temperature is estimated at 55°C with a standard deviation of 2.5°C. The mean minimum pavement temperature is -9°C with standard deviation of 1.5°C. What PG grade asphalt is needed at 98% reliability?
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.
Chapter 18 Solutions
Traffic and Highway Engineering
Ch. 18 - Prob. 1PCh. 18 - Prob. 2PCh. 18 - Prob. 3PCh. 18 - Prob. 4PCh. 18 - Given the specifications for an asphaltic concrete...Ch. 18 - Given the particle size distributions of two...Ch. 18 - Given the particle size distributions of two...Ch. 18 - Given four different types of aggregates to be...Ch. 18 - Prob. 9PCh. 18 - Prob. 10P
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- Problem No. 1A flexible pavement for an urban interstate highway is to be designed using the AASHTO method to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water to be drained from within the pavement and the pavement structure will be exposed to moisture levels approaching saturation for 30% of the time. The following additional information is available: Elastic modulus of asphalt concrete = 450,000 psiResilient modulus of base material = 35,000 psiResilient modulus of subbase material = 15,000 psiCBR of subgrade material = 8arrow_forwardSubject: Transportation Engineering An asphalt pavement carries a static wheel load of 125 kN. The circular contact radius of the tire is 180 mm and the transmitted load is distributed across a wide area of subgrade at an angle of 47°. The subgrade bearing value is 0.30 MPa while that of the base is 0.60 MPa. Design the thickness of the pavement and that of the base ? Please give me right solution.. urgenttttttttt help me Thank youarrow_forwardThe elastic modulus of mid-range aggregate asphalt pavement is 480 MPa while its subgrade has an elastic modulus of 55 MPa. What is the stiffness factor of the flexible pavement? 0.12 0.61 0.34 0.49arrow_forward
- Q1A In a Marshall test, the percentage of asphalt binder by total weight of aggregate is 5.3%. The bulk specifc gravity of aggregate (G)-2.582, the specifc gravity of asphalt binder (G)=1.000, and the density of water 3 (Yw)=1.000 g/cm. If the voids flled with asphalt (VFA) is 70.0% and the effective asphalt binder (Pbe) is 4.0% by total weight of mixture, determine the following properties: a. The absorbed asphalt binder (Pba) b. The bulk specifc gravity of the compacted mixture (Gmb) c. The voids in mineral aggregate (VMA) d. The voids in total mixture (VTM) e. The theoretical maximum specifc gravity of the loose mixture (Gmm) The effective specifc gravity of the aggregate (Gse) الarrow_forwardAs shown in the figure below, a flexible pavement is consisted of 40 mm dense graded asphalt and 375 mm high standard unbound granular material. Use the Austroads method to characterize the vertical and horizontal modulus of the unbound granular material. Asphalt, Ev=4000 MPa Unbound granular meterial Subgrade, CBR = 5 ttach File Browse Local Files Browse Content Collection 40 mm 375 mmarrow_forwardWhat standard PG asphalt binder grade should be selected under the following conditions: The seven-day maximum pavement temperature has a mean of 57°C and a standard deviation of 2°C. The minimum pavement temperature has a mean of -6°C and a standard deviation of 3°C. Reliability is 98%.arrow_forward
- A rigid pavement is to be used to carry a wheel load of 50.93 kN. Enough dowels will be used across the joint. What will be the difference in thickness (in mm) between the edge and the center of the pavement? The allowable tensile strength of concrete is 1.39 MPa.arrow_forwardAs a materials engineer working for a highway department, what standard PG asphalt binder grade would you specify for each of the conditions shown in Table P9.14 (show all calculations and fill in the table)? TABLE P9.14 Seven-Day Maximum Pavement Temperature Minimum Pavement Recommended Temperature PG Grade Standard 98% Mean, °C Deviation, °C Reliability Reliability Standard 50% Case Mean, °C Deviation, °C 1 43 1.5 -29 2.5 2 51 -18 4 62 2.5 10arrow_forwardA pavement consists of 5 inches of asphalt underlain by a crushed stone based course. There is no sub base. The asphalt has an elastic modulus of 350,000 psi at room temperature and the base course has a CBR of 70. Determine the thickness of the crushed stone base needed to reach an SN of 2.85. Assume the base course is saturated 5% of the time and drains within a day.arrow_forward
- As a materials engineer working for a highway department, what standard PG asphalt binder grade would you specify for each of the conditions shown in Table P9.15 (show all calculations and fill in the table)? TABLE P9.15 Seven-Day Maximum Pavement Temperature Minimum Pavement Recommended Temperature PG Grade Standard Standard 50% 98% Case Mean, °C Deviation, °C Mean, °C Deviation, °C Reliability Reliability 1 39 -32 3.5 54 1.5 -17 2 3 69 2.5arrow_forwardThe Roman design for their primary U.K. roads generally consisted of layers. 2 3 5 It appears that the first tar macadam pavement was placed in UK France USA Russia coat is to bind the granular base to the asphalt layer. seal prime tack all of the above Normally, a flexible pavement contains: surface layer+base layer surface layer+subgrade layer surface layer+base layer+subgrade layer base layer+subgrade layer The joint spacings of the jointed plain concrete pavement are between O no joint is needed in the JPCP. 300-700 ft 30-100 ft 15-30 ftarrow_forwardGive me right solution... Urgent please A 5 tonne wheel load is applied on a pavement and generates a surface deflection of 0.15 mm. A. If the pavement is 125 mm thick, what is the vertical stress at the top of the subgrade? B. If the equivalent radius of tyre contact is 100 mm and Poisson’s ratio is 0.3, what is the pavement’s modulus of elasticityarrow_forward
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