Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 18, Problem 4P
To determine
Whether the properties of the given material meet the Asphalt Institute specifications.If not, then the differences are to be noted.
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Q2) The following results were obtained from testing a certain asphalt binder:
RTFO aged PAV
Original
Asphalt
aged
asphalt
asphalt
DSR
G° (kPa)
8 (C)
0.98
2.1
6000
75
70
60
BBR
S@ 60-sec (MPa) | 300
M@ 60-sec
450
650
0.6
0.5
0.4
DTT
Failure Strain (%) 2.5 %
2 %
1.2%
Determine if the asphalt meets the Superpave specification requirements to resist the following
distresses:
(a) Rutting
(b) Fatigue cracking
(c) Low temperature cracking
Determine the allowable number of repetitions N for an asphalt mix which has the design modulus of 3.2
x 10 kPa. The load induced tensile strain at the base of the asphalt beam specimen was 150με. Given, the
percentage by volume of bitumen in the asphalt was 10.0, the laboratory to service life fatigue factor was 5,
and the project had a desired reliability of 90%.
Table 6.16: Suggested reliability factors (RF) for asphalt fatigue
Desired project reliability
85%
90%
3.0
3.9
50%
1.0
80%
2.4
95%
6.0
97.5%
9.0
Q. 3
a) Distinguish clearly between hot-mix asphalt and warm-mix asphalt. Why is the latter set to
become the mix of the future in asphalt pavement works?
b) Explain why asphalt concrete samples from the hot-mix plant are taken for compaction in the
laboratory during asphalt overlay construction.
c) The following data was taken from a laboratory work sheet on the design of asphalt concrete
by the Superpave procedure for a selected aggregate structure:
Trial Mix 1
%Gmm@Ndegn=96%, Qam=2470kg/m
Trial Mix 2
P.=5.0%, Gmb@Nasgn=2.305
Based on the data, determine the following:
i.
P, of Mix 1
11.
VMA of Mix 1
111.
Gmm of Mix 2
Take Ga =2.65, G=2.69, for the aggregates and G,=1.02 for the bitumen used.
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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- In a Marshall test, the percentage of asphalt binder by total weight of aggregate is 5.0%. The bulk specifc gravity of aggregate (G3)=2.624, the specifc gravity of asphalt binder (G)=1.000, and the density of water (Y)=1.000 g/cm³. If the absorbed asphalt (Pa) is 2.00% by total weight of aggregate, and the voids in total mixture (VTM) is 4.0%, determine the following properties: a. The effective asphalt content (Pbe) b. The bulk specifc gravity of the compacted mixture (Gmb) c. The voids in mineral aggregate (VMA) d. The theoretical maximum specifc gravity of the loose mixture (Gmm) e. The voids flled with asphalt (VFA) f. The effective specifc gravity of aggregate solids (G)arrow_forwardAs part of mix design, a laboratory-compacted cylindrical asphalt specimenis weighed for determination of bulk-specific gravity. The following numbersare obtained:Dry mass in air = 1264.7 gramsMass when submerged in water = 723.9 gMass of saturated surface dry (SSD) = 1271.9 ga. What is the bulk-specific gravity of the compacted specimen (Gmb)?b. If the maximum theoretical specific gravity of the specimen (Gmm) is2.531, what would be the air void content of the specimen in percent?arrow_forwardQ3) You are required to determine if a certain asphalt can be graded as PG 58 - 28. What agingequipment and testing temperatures should use for the following tests? Explain the rational behind selecting the above testing temperatures.a) Dynamic Shear Rheometer for rutting analysis.b) Dynamic Shear Rheometer for fatigue cracking analysis.c) Bending Beam Rheometer for low temperature cracking analysis.d) Direct Tension Tester for low temperature cracking analysis.arrow_forward
- An asphalt concrete specimen has the following properties:Asphalt content = 5.5% by total weight of mixBulk specific gravity of the mix = 2.475Theoretical maximum specific gravity = 2.563Bulk specific gravity of aggregate = 2.689 Ignoring absorption, calculate the percents VTM, VMA, and VFA.arrow_forwardUse the following volumetric relationships for asphalt mix analysis: VTM = 100 (1 - Gmb) VFA = 100 3. An asphalt concrete specimen has the following properties: Asphalt content = 5.5 % by total weigh of mix Bulk specific gravity of the mix = 2.475 Theoretical maximum specific gravity = 2.563 Bulk specific gravity of aggregate = 2.689 Assuming there is no absorption of binder, calculate the following: (a) Percent Voids in Total Mix (b) Percent Voids in Mineral Aggregate: VMA – VTM VMA (c) Percent Voids filled with asphalt: VMA = = (100 - Gmb Ps Gsbarrow_forward3. As part of mix design, a laboratory-compacted cylindrical asphalt specimen is weighed for determination of bulk specific gravity. The following numbers are obtained: Dry Mass in air = 1264.7 grams • Mass when submerged in water = 723.9 grams • Mass of Saturated Surface Dry (SSD) = 1271.9 grams %3D a.What is the bulk specific gravity of the compacted specimen (Gmb)? b.lf the maximum theoretical specific gravity of the specimen (Gmm) is 2.531, what would be the air void content of the specimen in percent? c. If the bulk specific gravity of aggregates is 2.675 and asphalt content is 5.5%, what is the voids in mineral aggregate and voids filled with asphalt in percent? Ignore absorption.arrow_forward
- Pane SHORT ANSWER List how high temperature failure of asphalt pavement occurs. Define oxidation in asphalt binder. Explain how asphalt pavement is produced at a drum mixer plant (HMA Production)arrow_forwardAs part of mix design, a laboratory-compacted cylindrical asphalt specimen is weighed for determination of bulk-specific gravity. The following numbers are obtained:Dry mass in air = 1264.7 gramsMass when submerged in water = 723.9 gMass of saturated surface dry (SSD) = 1271.9 ga. What is the bulk-specific gravity of the compacted specimen (Gmb)?b. If the maximum theoretical specific gravity of the specimen (Gmm) is 2.531, what would be the air void content of the specimen in percent?arrow_forwardQ1 (c) In a Marshall test, the percentage of asphalt binder by total weight of aggregate is 5.26%. The bulk specific gravity of aggregate (Gsb) = 2.455, the specific gravity of asphalt binder (Gb) = 1.020, and the density of water (yw) = 1.000 g/cm^3. If 1 m^3 of an asphalt concrete mixture will be produce that having 2000 g and the asphalt absorbed into the aggregate is 24 gram : (i) Calculate asphalt content, effective asphalt content and asphalt absorption. (ii) Calculate void in mineral aggregate and void filled with asphalt.arrow_forward
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