Which Performance Grade asphalt binder would work best in resisting low temperature cracks and which would work best in preventing rutting? a) 58-22 b) 60-20 c) 80-35 d) 82-33
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Which Performance Grade asphalt binder would work best in resisting low temperature cracks and which would work best in preventing rutting?
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- A CRCP has a crack spacing of 10 ft and a temperature differential of 56°F. Measured edge deflection by Dynaflect is 0.0007 in. By the Asphalt Institute procedure, determine the required thickness of asphalt overlay and check for whether undersealing is required.What standard PG asphalt binder grade should be selected under the following conditions:a. The seven-day maximum pavement temperature has a mean of 62°C and a minimum pavement temperature of -15°C. (table9.2) b. According to part a, what is your recommendation for 20 million ESALs and 50 km/h speed? (table ESALs) c. For 50 million ESALs and 80 km/h speed. (table ESALs)Why is warm asphalt preferred? Explain this with reference.
- An agency uses the following formula to determine pavement condition rating, PCR = 99.3 − 5.51 (5.0-ROUGH) − 1.59 LNALL − 0.221 AVGOUT − 0.0306 LONG − 0.531 TRAN, where we have the following. ROUGH = roughness measured by present serviceability rating (PSR), scale of 0 to 5 LNALL = natural logarithm of alligator cracking, ft per mile AVGOUT = outer wheel path rutting (all locations averaged), 0.01 inch LONG = longitudinal cracking, ft per mile TRAN = transverse cracking, number of cracks per mile And, present serviceability rating is determined as the following. PSR = 5e−0.0051118 · IRI − 0.0016027 A pavement section has the following distress data. IRI = 108 in./mi Alligator cracking = 110 ft/mi Average rutting = 0.20 in. Longitudinal cracks = 130 ft/mi Transverse cracks = 12/mi Determine the current PCR for this section. PCR = Now, assume a new roughness measurement is expected soon. When PCR falls below 60, the section will be scheduled for rehabilitation. Determine the new IRI…Choose standard PG asphalt binder grade for the following condition: (show your calculation) The seven-day maximum pavement temperature has a mean of 45°C and standard deviation of 4°C The minimum pavement temperature has a mean of -26C and a standard deviation of 2.0°C. a) At reliability of 84% b) At reliability of 98%.Mark the correct statement: a) The ISC steps are: Compaction, Expansion and Simple Axial Compression b) The MR Resilience Module measures the variation in stress with permanent deformation, there is no rupture in the test c) The MR Resilience Module can be performed in a triaxial cell and dynamic loading that best represents the pavement
- How can we improve Moisture Susceptibility of asphalt?highway engineering labartory name test "Standard Test Method for Ductility of Bituminous Materials" discuss what mean if the asphalt exceeded 100 and don't cut?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.
- Why is it important to have optimum binder content in Hot-Mix-Asphalt? What would happen if a less-than-optimum binder content is used? What would happen if more than the optimum value is used? What is the typical range of binder content in HMA?Problem No. 1A flexible pavement for an urban interstate highway is to be designed using the AASHTOmethod to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water tobe drained from within the pavement and the pavement structure will be exposed to moisturelevels approaching saturation for 30% of the time. The following additional information is available: Elastic modulus of asphalt concrete = 450,000 psiResilient modulus of base material = 35,000 psiResilient modulus of subbase material = 15,000 psiCBR of subgrade material = 8(a) Consider designing the same pavement with only asphalt concrete and base layer (excluding subbase layer). Use the information provided in Problem 1. (b) Compare strengths and weaknesses of each design.what are the pros and cons and which one is better for a parking lot: porous asphalt vs pervious concrete.
