Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 18, Problem 2P
To determine
The factors that influence the durability of asphalt materials and the effect that each factor has on the materials.
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What are the organic substances in the production of warm asphalt? Please explain with reference.
Answer the question false or. true
oxidized asphalt are not used commonly in highway construction
Q4) Determine the PG grade of the asphalt whose results are shown in the table below? Show all
calculations and comparisons with Superpave requirements.
Test
Results
Original Properties
Flash point temperature, °C
278
Viscosity @ 135 °C
0.490 Pa.s
Dynamic shear Rheometer
@ 82 °C
@ 76 °C
G* = 0.82 kPa, 8 = 68°
G* = 1.00 kPa, 8 = 64°
@ 70 °C
G* = 1.80 kPa, 8 = 60°
Rolling Thin Film Oven Aged Binder
Mass loss, %
0.63
Dynamic shear Rheometer
@ 82 °C
@ 76 °C
G* = 1.60 kPa, 8 = 65°
G* = 2.20 kPa, ô = 62°
@ 70 °C
G* = 3.50 kPa, 8 = 58°
Rolling Thin Film Oven and PAV Aged Binder
Dynamic shear Rheometer
@ 34 °C
@ 31 °C
@ 28 °C
G* = 2500 kPa, 8 = 60°
G* = 3700 kPa, 8 = 58°
G* = 4850 kPa, 8 = 56°
Bending Beam Rheometer
@ -6 °C, 60-sec
@ -12 °C, 60-sec
@ -18 °C, 60-sec
S = 255 MPa, m = 0.329
S = 290 MPa, m = 0.305
S = 318 MPa, m = 0.277
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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- Given four different types of aggregates to be used to produce a blended aggregate for use in the manufacture of asphaltic concrete, determine the bulk specific gravity of the aggregate mix.arrow_forwardList the typical four types of materials in pavement engineering and describe the three basic structures of asphalt mixture in civil engineering.arrow_forwardwhich of the following statements is true O all of these are true consistency of asphalt are varying with temperature consistency depend on weathering and durability consistency of several asphalt types are similar at same temperaturearrow_forward
- 1. What name is given to asphalt based on its consistency at room temperature? 2. Asphalt cement is classified into grade based from the result of what test?arrow_forwardExplain following objectives of hot mix asphalt (HMA).i) Deformation resistance ii) Moisture damage resistancearrow_forwardAnswer the question false or true Correspondence in the degrees of penetration between several types of solid asphalt at a temperature of 25 degrees does not mean complete compatibility between these types, as the behavior may differ at high temperatures and at lower temperaturesarrow_forward
- Which factors influence the durability of asphalt materials and the effect each factor has on the material.arrow_forwardSeveral types of fillers, such as crushed fines, portland cement, lime, fly ash, and carbon black, can be added to asphalt concrete. Fillers are used to satisfy gradation requirements of materials passing the 0.075 mm sieve, increase stability, improve bond between aggregates and asphalt, or fill the voids and thus reduce the asphalt required.arrow_forwardDiscuss five different desirable characteristics of aggregate used in asphalt concrete.arrow_forward
- Q3) 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_forwardAsphalt materials are recognized by the properties associated with the terms “setting”and “curing”. Explain the meaning of the two terms and explain the type of asphalt that corresponds to the two terms.arrow_forwardHow can we improve Moisture Susceptibility of asphalt? What are the main reasons of asphalt collapse? What is the desired air content of asphalt? What are the problems with higher air contents? Whatare the issues with lower air contents?arrow_forward
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