Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 18, Problem 13P
To determine
The asphalt absorption of the optimum mix.
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A 7-day average high temperature of the pavement at a ¾” depth is expected to be 138 degrees F (std. dev. 3.5 deg. F), and the average low temperature in the pavement is expected to reach 10 degrees F (std. dev. 2.5 deg. F). The pavement will be used to repave the intersection of a busy local road. Address the following:
a) Determine the performance grade of the asphalt that should be used for this pavement with 98% reliability.
b) Discuss the general considerations for ductility of the binder for the conditions stated.
c) If a penetration test yields a penetration of 8.5 mm into the asphalt, list its penetration grade, viscosity grade, and expected flashpoint.
d) Discuss the suitability of the addition of lime to the pavement mix.
A flexible pavement has hot mix asphalt of 4 inch, crushed stone = 8 inch, CBR =4 Calculate value of x and u.
Answer the question false or. true
asphalt type (Mc‐3000) is more softer than asphalt type (MC-70)
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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- An asphalt distributor having a 12 -ft long spray bar will be used to apply a tack coat at a residual application rate of 0.05 gal/sy. The road being paved is 24 ft wide and 2 miles in length. How many gallons of liquid cement for the tack will be required? How many gallons of emulsion tack are needed if the mixture is 70% liquid asphalt and 30% water?arrow_forwardCompute the dust proportion for the asphalt mixture having the following properties:arrow_forwardDistinguish clearly between hot-mix asphalt and warm-mix asphalt. Why is the latter set tobecome the mix of the future in asphalt pavement works?arrow_forward
- Determine the percentage of voids filled with asphalt for a paving mixture with relative compaction equal to 96%. Asphalt content is 5.5% by total mix content and with specific gravity=1.03. The bulk specific gravity of the combined aggregate is 2.67. The maximum theoretical specific gravity of the mixture 2.48. The weight and volume of Marshall specimen = 1200g and 482. cm³ respectively.arrow_forwarddraw the graphs of asphalt binder content on the x-axis versus the following on the y-axisa) Marshall stabilityb) Marshall flowc) Percent air voids in the total mixture, Pad) VMAe) VFA.II selecting the optimum asphalt binder contentarrow_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
- Flexible Pavement Design Assume the thickness of Base Course and Sub Base Course. Compute the SN of Asphalt, Asphalt treated Base, Base course, and Sub base course. Compute the thickness of Asphalt and Asphalt Treated Base.arrow_forwardTable 3 lists data used in obtaining a mix design for an asphalt paving mixture. If the maximumspecific gravity of the mixture is 2.41 and the bulk specific gravity is 2.35, determine: (a) thebulk specific gravity of aggregates in the paving mixture, (b) the asphalt absorbed, (c) theeffective asphalt content of the paving mixture, and (d) the percent voids in the mineralaggregate VMAarrow_forwarddiscuss BRIEFLY the effects of at least 10 Deficiencies in Asphalt Mixarrow_forward
- The table below lists data used in obtaining a mix design for an asphalt paving mixture. If themaximum specific gravity of the mixture is 2.41 and the bulk specific gravity is 2.35,Determine:(a) the bulk specific gravity of aggregates in the mix(b) the asphalt absorbed (c) the effective asphalt content of the paving mixture(d) the percent voids in the mineral aggregate VMAarrow_forwardThe table below lists data used in obtaining a mix design for an asphalt paving mixture. If themaximum specific gravity of the mixture is 2.41 and the bulk specific gravity is 2.35,Determine:(a) the bulk specific gravity of aggregates in the mix (b) the asphalt absorbed (c) the effective asphalt content of the paving mixture (d) the percent voids in the mineral aggregate VMA.arrow_forwardFor the following temperature conditions, calculate the proper PG grade for both 50% and 98% reliabilities (show your calculation).Seven-day maximum pavement temperature of 48°C with a standarddeviation of 2.5°C. Minimum pavement temperature of -21°C with a standard deviation of 3°C.arrow_forward
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