PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 4, Problem 8P
To determine
The probability that the pavement will last
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A flexible pavement is designed with 5 inches of hot-mix asphalt (HMA) wearing surface, 6 inches of hot-mix asphaltic base, and 10 inches of crushed stone subbase. All drainage coefficients are 1.0. Daily traffic is 200 passes of a 20-kip single axle, 200 passes of a 40-kip tandem axle, and 80 passes of a 22-kip single axle.If the initial minus the terminal PSI is 2.0 (the TSI is 2.5), the soil resilient modulus is 3000 lb/in2, and the overall standard deviation is 0.6, what is the probability(reliability) that this pavement will last 20 years before reaching its terminal serviceability?
A flexible pavement was designed for the following daily traffic with a 12-year design life. The highway was designed with
4" of hot-mix wearing surface (0.44); 4" of hot-mix asphaltic base (0.40), and 8" of crushed stone base (0.11). Reliability
was 70% (-0.524), overall standard deviation was 0.50. APSI = 2.0 (with TSI of 2.5), all drainage coefficients were 1.0.
What was the CBR used in the design?
1300 passes single axdes at 8,000 lb each (0.03925)
900 passes tandem axles at 15,000 |b each (0.0431)
20 passes single axles at 40,000 lb, each (22.164)
200 passes tandem axles at 40,000 Ik each (2.0242)
(APSI
log10(W13) = Z,S, + 9.36 ( log10( SN + 1)) – 0.20 +
0.40 +
logia 2.7
1094
[(SN + 1)15
+ 2.32 log10(Ma)l- 8.07
A flexible pavement is to be constructed with a inches of sand-mix asphaltic wearing surface, b inches of emulsion/aggregate-bituminous
base, c inches of crushed stone subbase. The base has a drainage coefficient of 0.90, while the subbase drainage coefficient is 1.0. What values
of a, b, and c will NOT satisfy SN deign value of 4.1.
О a. 5, 9,
O b. 2, 9,
О с. 5, 8,
O d. 5, 7,
О е. 3, 8,
O f. 4, 7,
O g. 4, 9,
O h. 3, 9,
O i. 3, 7,
O j. 6, 8,
and 9
and 9
and 9
and 9
and 10
and 10
and 9
and 10
and
and
10
10
Chapter 4 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
Ch. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10P
Ch. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32P
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- A flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8,000 lb each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 lb each, and 200 tandem axles at 40,000 lb each. The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, ¨PSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. What was the soil resilient modulus of the subgrade used in design?arrow_forwardA flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8,000 lb each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 lb each, and 200 tandem axles at 40,000 lb each. The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, " PSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. What was the soil resilient modulus of the subgrade used in design?arrow_forwardA flexible pavement was initially designed with 2 inches of sand-mix asphaltic wearing surface, 9 inches of dense-graded crushed stone base, 8 inches of crushed stone subbase. The base has a drainage coefficient of 0.90, while the subbase drainage coefficient is 1.0. If pavement is designed for 54-kip tandem axles vehicles, by how much daily traffic can be increased if wearing layer will be increased by 3 inches. State your answer in % in a form 00.00%. Round SN value to the nearest integer.arrow_forward
- A flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8,000 Ib each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 Ib each, and 200 tandem axles at 40,000 Ib each. The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, "PSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. What was the soil resilient modulus of the subgrade used in design?arrow_forwardProblem 3. A rigid pavement is to be designed to provide a service life and has an initial PSI of 4.4 and a TSI of 2.5. The modulus of subgrade reaction is determined to be 300 lb/in³. For design, the daily car, pickup truck, and light van traffic is 20,000; and the daily truck traffic consists of 200 passes of single-unit trucks with single and tandem axles, and 410 passes of tractor semi-trailer trucks with single, tandem, and triple axles. The axle weights are cars, pickups, light vans = two 2000-lb single axles (equivalency factor = 0.0002) single-unit trucks = 10,000-lb steering, single axle (equivalency factor = 0.081) = 22,000-lb drive, tandem axle (equivalency factor = 0.305) tractor semi-trailer trucks = 12,000-lb steering, single axle (equivalency factor = 0.1750) = 18,000-lb drive, tandem axle (equivalency factor = 0.132) = 50,000-lb trailer, triple axle (equivalency factor = 3.02)arrow_forwardA flexible pavement was designed to have a 6-inch sand-mix asphaltic surface, 8-inch soil-cement baseand a 21-inch crushed-stone subbase (all drainagecoefficients are 1.0). The pavement was designed for800 12-kip single axles and 1600 34-kip tandem axlesper day in the design direction. The reliability used was90%, the overall standard deviation was 0.35, initial PSIwas 4.7, the TSI was 2.5 and the soil resilient moduluswas 2582 lb/in2. If the road has three lanes in the designdirection (and was conservatively designed), for howmany years was the pavement designed to last?arrow_forward
- ▪ A roadway is determined to have 400 18-kip single axles, 200 24-kip single axles, and 100 40- kip tandem axles per day. The subgrade CBR is 10 and the roadway pavement is designed for an overall standard deviation of 0.45, a reliability 99.9% and the initial PSI is 4.5 and the TSI is 2.5. One newly constructed section of this roadway is a rigid pavement designed with a 10- inch slab with a modulus of rupture of 900lb/in², and a modulus of elasticity of 4.5x10 lb/ in², and a joint transfer coefficient of 3.2. Another newly constructed section of the same roadway is a flexible pavement with a 4-in sand-mix asphaltic concrete surface, 9-in dense- graded crushed stone base and a 9-in crushed-stone subbase. If the roadway has three lanes in each direction and is conservatively designed, which of the pavement sections will last longer and by how many years if all drainage coefficients are 1.0?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_forwardQ2: A pavement system must be designed to accommodate 1,000 20-kip single axle loads per day. The pavement should provide 99% reliability and accommodate a standard devation of 0.35. The pavement should be comprised of either a 10-inch concrete slab or a 6-inch hot-mix asphalt surface on top of a 7-inch dense-grade crushed stone base and a 10-inch crushed stone subbase. Determine whether the rigid or flexible pavement will lost longer given the following pavement and soil characteristics: • PSI = 4.5 (both pavements) • TSI = 2.5 (both pavements) • CD = 1.0 • E = 4,000,000 • k= 300 pci • J= 3.0 • M2 = M3 = 1.0 • MR = 12,500 psi • S' = 1,000 psi Use the AASHTO pavement design equations or nomograph.arrow_forward
- A flexible pavement is constructed with 5 inches of sand-mix asphaltic wearing surface (a = 0.35), 9 inches of dense-graded crushed stone base (a = 0.18), and 10 inches of crushed stone subbase (a = 0.11). The base has a drainage coefficient of 0.90 while the subbase drainage coefficient is 1.0. Determine the structural number of the pavement.arrow_forwardA northbound direction on an interstate highway consists of four lanes of flexible pavement. It is conservatively designed with a 10-inch sand-mix asphaltic surface, 10-crushed stone base, and a 10-inch crushed-stone subbase (all drainage coefficients are 1.0). The subgrade CBR is 3, the overall standard deviation is 0.4, and the reliability is 95%. The initial PSI is 4.6 and the final PSI is 2.5. Daily total northbound road traffic consists of 51,000 cars (each with two 2-kip single axles), 840 buses (each with two 20-kip single axles), and 1,000 heavy vehicles (each with one 12-kip single axle and two 34-kip tandem axles). How many years was this pavement designed to last?arrow_forwardA flexible pavement has a structural number of 3.8(all drainage coefficients are equal to 1.0). The initialPSI is 4.7 and the terminal serviceability is 2.5. The soilhas a CBR of 9. The overall standard deviation is 0.40and the reliability is 95%. The pavement is currentlydesigned for 1800 equivalent 18-kip single-axle loadsper day. If the number of 18-kip single-axle loads wereto increase by 30%, by how many years would thepavement’s design life be reduced?arrow_forward
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