Flexible road pavement is more popular as compared to concrete road pavement in Malaysia. i) Discuss why flexible road pavement is more popular. ii) Describe one (1) test that is used to measure hardness of bituminous material

Flexible road pavement is more popular as compared to concrete road pavement in Malaysia. i) Discuss why flexible road pavement is more popular. ii) Describe one (1) test that is used to measure hardness of bituminous material

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter20: Design Of Rigid Pavements

Section: Chapter Questions

Problem 7P

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Concept explainers

Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.

Question

Flexible road pavement is more popular as compared to concrete road pavement in Malaysia.
i)
Discuss why flexible road pavement is more popular.
ii)
Describe one (1) test that is used to measure hardness of bituminous material

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3. a) What is meant by dowel bar? Why it is used in the rigid pavement? b) Design the Dowel Bars for the following parameters: i) Design wheel load = 5100 kg ii) Design load transfer 40% iii) Slab thickness 30 cm iv) Joint width = 2.0 cm v) Modulus of dowel support = 42000 kg/em3 vi) Modulus of elasticity of dowel bar = 2x106 kg/cm2 vii) Modulus of subgrade reaction = 8 %3D viii) Grade of concrete = M 50
Solve.
Highway engineering civil engineering Question number (36)
A standard 80 kN SADT load was applied on the surface of the pavement. The tensile strain at the bottom of the asphalt layer was 187 microstrain. Determine the magnitude of the strain (in microstrain) which would be induced at the bottom of the asphalt layer if a SADT with a load of 21 was applied. (please provide your answer to two decimal points)
As a materials engineer working for a highway department, what standard PG asphalt binder grade would you specify for each of the conditions shown in Table P9.14 (show all calculations and fill in the table)? TABLE P9.14 Seven-Day Maximum Pavement Temperature Minimum Pavement Recommended Temperature PG Grade Standard 98% Mean, °C Deviation, °C Reliability Reliability Standard 50% Case Mean, °C Deviation, °C 1 43 1.5 -29 2.5 2 51 -18 4 62 2.5 10
(6) Two AC-20 asphalt concrete core samples are taken from an existing flexible pavement. Each sample has a diameter of 4 inches and a thickness of 2.5 inches. (a) If the first sample, tested in the indirect tensile apparatus, failed under a maximum load of 2,500 lbs, calculate the tensile strength of the AC-20 asphalt concrete mixture. (b) Under a dynamic load of 50 lbs, applied on the second specimen in the transducer arrangement for the diametral modulus test, a horizontal recoverable deformation of 0.076*10 inches is measured at 70° F. What is the resilient modulus of the asphalt concrete (AC) layer in the field (use the equation on page 283)?
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.
The following arrangement model represents the behavior of the asphalt sample under constant stress. Calculate the total strain when the stress was removed after 3 sec. T G1-1.1 G2 G2 79.7 G2 In :9.3 61
The following results were obtained for an asphalt binder. Determine if the binder meets the Superpave specifications for the following. Justify your answer. a) Rutting; b) Fatigue cracking and c) Low-Temp. cracking
Question number (26) Highway Engineering civil engineering
A rigid pavement has a wheel load capacity of 53.95 kN. The allowable tensile stress of concrete is 1.96 MPa. Determine the thickness (cm) of the pavement if dowels are negligible. Express your answer in 1 decimal place.
An asphalt pavement has a typical cross-section shown in Figure SPC-802. The maximum permissible stresses of the road materials are as follows: 1. Base allowable bearing pressure Subgrade allowable pressure 0.18 MPa 0.50 MPa Determine the following: Maximum allowable static wheel load, W that can be applied on the surface layer if the radius of contact between tire and pavement is 186 mm. The actual bearing stress induced on the base course layer when subgrade reaches maximum allowable pressure. c. The actual bearing stress induced on the subgrade when a static wheel load of 104 kN is imposed on the pavement. a. b. 50 mm Asphalt Base 180 mm 3.20 m Subgrade Figure SPc-802 Typical Road Cross-Section