Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 15P
To determine
The design of a flexible pavement using the 1993 AASHTO procedure.
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an interstate highway pavement composed of a hma surface course, a cement treated base course, and a sand–gravel subbase is to be designed for an esal of 1.2*10^6.the quality of drainage is considered fair because water can be removed from the subbase within a week. however, there is a large amount of precipitation, so more than 25% of the time the pavement will be exposed to moisture levels approaching saturation. the material properties are as follows: effective roadbed soil resilient modulus = 5,500 psi, resilient modulus of subbase = 15,000 psi, unconfined compressive strength of cement-treated base at 7 days = 500 psi, and resilient modulus of hma = 4.3*10^5 psi. assuming a minimum thickness for hma, determine the thicknesses of the surface, base,and subbase courses required.
Assuming a minimum thickness for HMA, determine the thicknesses of the surface, base,and subbase courses required.
Pavement 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.
26. Refer to Figure 8 Design 1A attached. For the design of a 4-lane interstate highway, the damage analysis
shown in the figure was performed for a 9.5-inch thick slab according to the PCA design approach. This
analysis indicates that the 9.5-inch thick slab:
a. Only satisfies the fatigue damage condition
b. Only satisfies the erosion damage condition
c. Satisfies both fatigue damage and erosion damage conditions.
d. None of the above
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- H.W: Design the pavement for an expressway consisting of an asphalt concrete surface, a crushed-stone base, and a granular subbase using the 1993 AASHTO design chart. The cumulative ESAL in the design lane for a design period of 15 years is 7* 10°. The area has good quality drainage with 10% of the time the moisture level is approaching saturation. The effective roadbed soil resilient modulus is 7 ksi, the subbase has a CBR value of 80, the resilient modulus of the base is 40 Ib, and the resilient modulus of asphalt concrete is 4.5 * 10$ psi. Assume a reliability level of 95% and So of 0.45.arrow_forwardA flexible pavement at an access road to a sportsstadium parking lot is designed with a 4-inch sand-mixasphaltic concrete surface, 5-inch aggregate bituminousemulsion base, and a 10-inch crushed stone subbase.There are 95 scheduled baseball and football games atthe stadium per year. The access road to the parking lotis three lanes in each direction (conservativelydesigned). The pavement was designed for recreationalvehicles with one 20K single axle and one 20K tandemaxle. There are 9,000 recreational vehicles estimated ateach event. Given that drainage coefficients are 1.0, theoverall standard deviation of traffic is 0.45, reliability is90%, and the soil's resilient modulus is 15,000 lb/in2,how many years will the access road last if the initialPSI is 4.0 and the terminal serviceability index is 2.5?arrow_forward2. You are asked to design a new flexible pavement structure for an existing road that will be totally replaced. You are provided with the following borehole results: a) Existing (Old) HMA - 135 mm b) Existing (Old) Granular A Base - 170 mm c) Existing (Old) Granular B Subbase - 340 mm d) Gravelly Silty Sand (Till) Subgrade (25 % 5-75 um) What is the current GBE for the existing pavement structure? What is the GBE for the same pavement structure when it was newly constructed?arrow_forward
- 2. Draw typical pavement deterioration curves for two types of pavements (A and B). Pavements A and B's lifespan are 20 and 40 years until they reach a failure threshold. The cost of constructing shorter life span pavement (A) is 5 million dollars per mile whereas the pavement with longer life span (B) costs 10 million dollars per mile. You have the option of using overlays to extend the life span of a pavement which may cost 1.5 million dollars per mile with expected lifetime of 10 years. When you consider total costs (assume no inflation), which pavement type would you choose?arrow_forwardA flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 10, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. Determine the number of daily trucks traveling in the peak direction. 150,814 B 75,407 C) 37,704 18,852arrow_forwardQ: Discuss various Design, Construction, and Supervision factors causing pavement failures? Subject: Pavement Structure and design. Program: MS in Transportation Engineeringarrow_forward
- Q9. The preventive rehabilitation technique is that which involves: a) surface applications of either structural or nonstructural improvements intended to keep the quality of the pavement above a predetermined level b) all means that enables the designer to consider each maintenance alternative in terms of a final product and then select the most appropriate one in terms of results desired and cost. c) the permanent or temporary repair of deficiencies on an as-needed basis d) a and b e) b and c Q10. When compacting a soil at wet to optimum, then; a) the soil fabric is oriented and it has lower permeability b) the soil fabric is dispersed and it has lower permeability c) the soil fabric is dispersed and it has a higher strength d) the soil fabric is dispersed and it has a lower strengtharrow_forward50 KPa is equivalent to: O A) 5x 10^6 N/m^2 O B) 5 x 10^5 N/m^2 O0 5 x 10^3 N/m^2 O D) 5 x 10^4 N/m^2 Concrete is required for a plain concrete pavement to be constructed in Southern Alberta. The pavement will be exposed to freezing, thawing, and deicers. If aggregates with a nominal maximum size of 20 mm are used, what is the minimum cement content per cubic meter of concrete as per the CSA Standard? OA) 320 kg O B) 335 kg OO 390 kg OD) 420 kg During Lab 5, the relative density of a coarse aggregate sample was determined. The sample of coarse aggregate was towel dryed to represent this moisture state: O A) OD B) Wet OC SSD O D) Air Dry When performing the slump test, each layer of concrete is rodded times as per CSA specifications: OA) 20 O B) 25 OO 30 O D) 12arrow_forwardA flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 10, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. Determine the number of daily trucks traveling in the peak direction.arrow_forward
- 12.7 Figure P12.7 shows a concrete pavement with the thicknesses and elastic moduli as indi- cated. Assume a modulus of rupture of 650 psi, a load transfer coefficient of 3.2, a service- ability loss from 4.5 to 2.0, and poor drainage with 5% of time near saturation. Determine the performance traffic by Eq. 12.21 without the reliability term and check the result by the AASHTO design chart. [Answer: 8.5 × 106] Portland Cement Concrete E = 4 x 106 psi Granular Subbase ESB = 30,000 psi Subgrade MR = 5000 psi 8 in. 8 in. FIGURE P12.7arrow_forwardDesign a flexible pavement (Two way-Two lane) for a subgrade CBR value of 3.5,the number of daily traffic as shown in the table below, the reliability value is 90%, the standard deviation 0.35, the initial serviceability 4.5, terminal serviceability 2.20 and effect of weather swelling only. Assuming a 20-year design life and growth rate 2%. Assume that 80% of the ESALs in one direction.. (E2-30,000 psi, E3-11,000 psi, m. m, 1.08). Sketch cross section in your design. All axles should be taken in ESAL calculations. (Take IMPa =145.0 psi) Vehicle Class Passenger Car Single-unit truck Single-unit truck Semi-trailer Light truck Large semi-trailer Axles Weights 2 single axles, 2000 lb/axle 1 single axle, 8000 lb/axle 1 single axle, 14,000 lb/axle I single axle, 7000 lb/axle 1 tandem axle, 20,000 lb/axle I tredom axle, 28,000 lb/ axle 1 single axle, 12,000 lb/axle 2 tandem axles, 22,000 lb/axle 2 single axles, 3000 lb/axle 1 single axle, 12,000 lb/axle 2 tandem axles, 28,000 lb/axle Number…arrow_forwardQ1: Design the pavement for an expressway consisting of an asphalt concrete surface, a crushed stone base, and a granular subbase using the 1993 AASHTO design method. The cumulative ESAL in the design lane for a design period of 15 years is 7×106. The area has good quality drainage with 10% of the time the moisture level is approaching saturation. The effective roadbed soil resilient modulus is 7 ksi, the subbase has a CBR value of 80, the resilient modulus of the base is 40×103 psi, and the resilient modulus of asphalt concrete is 4.5×105 psi. Assume a reliability level of 95%, So of 0.45, po = 4.6, and pt = 3.0.arrow_forward
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