(a) What is SuperPave Method of mix design? What are the main advantages and disadvantage of SuperPave, Hveem, and Marshall method of mix design? (b) What is SuperPave Gyratory Compactor (SGC)? How SGC simulate actual field conditions in the laboratory? (c) SuperPave offers futuristic approach for the selection of binder to be used in asphalt pavements. Explain with examples?

(a) What is SuperPave Method of mix design? What are the main advantages and disadvantage of SuperPave, Hveem, and Marshall method of mix design? (b) What is SuperPave Gyratory Compactor (SGC)? How SGC simulate actual field conditions in the laboratory? (c) SuperPave offers futuristic approach for the selection of binder to be used in asphalt pavements. Explain with examples?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter18: Bituminous Materials

Section: Chapter Questions

Problem 5P: Given the specifications for an asphaltic concrete mixture and the results of a sieve analysis,...

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The Superpave volumetric procedure has been widely implemented, with success- ful results. However, the method lacks a strength test to verify the suitability of the Superpave mixes. Research completed in NCHRP Project 9-19 developed "simple performance tests" for asphalt concrete (Witczak et al., 2002), currently called the Asphalt Mixture Performance Tester, AMPT, Figure 9.34. The AMPT is not currently a requirement for Superpave mix design, but implementation studies are underway. In addition, the test method was designed to capture the material properties needed for the Mechanistic Empirical Pavement Design System, MEPDS. The equipment and associated protocols of the AMPT tests are designed to cap- ture the viscoelastic behavior of asphalt concrete. Tests based on measurement of dynamic modulus (for both of permanent deformation and fatigue cracking), flow time (permanent deformation), and flow number (permanent deformation) were selected for further field validation. The three…
How do you simulate asphalt pavement aging during construction and for the first couple of years in Superpave mix design? Using RTFO Using DSR Using PAV Using BBR
E Q2: Two types of asphalt cement (A and B) have been tested with different temperatures to indicate the kinematic viscosity and the table below presented the results. 1- Draw the viscosity vs temperature chart, 2- Indicate the raixing and compaction temperatures ranges for each type, 3- Which one is more susceptible to temperature change? 130 140 Temperature, C Kinematic viscosity, centistoke Type A Type B 600 800 420 500 150 300 290 160 220 180 Dis 170 D857
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.
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A sample of aggregate weighing of 3800g. 45.5% retaining on sieve No.4. and 48.5% it is retaining on sieve No 200. If bulk specific - gravities of coarse , fine and mineral filler aggregates are 2.59 , 2.66 , and 2.69 respectively, determine the optimum asphalt conten as a percentage of the total mix if results obtained using the Marshall method are shown in the table below. The specific gravity of the asphalt is 1.05. Given that the specifications required minimum Marshal Stability of ( 7kN ). Flow (2-4mm) and percent of air voids (3-5%). (Note: if the mix is not satisfy the requirement, please explain how to adjust it). Marsha test Weight of sample (gm) Asphalt content (%) Stability (kN) Flow (mm) In air In water 0.04 1260.4 716.3 6.25 2.9 0.045 1298.9 747.8 7.1 3.2 0.05 1127.7 652.9 7.9 3.8 0.055 1222.5 705.6 7.5 4.5 0.06 1182.6 679.8 5.9 6.05
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The mix design for an asphalt concrete mixture requires 2 to 6% minus 0.075 mm. The three aggregates shown in Table P.5.34 are available. TABLE P5.34 Minus 0.075 mm Coarse 0.5% Intermediate 1.5% Fine Aggregate 11.5% Considering that approximately equal amounts of coarse and intermediate aggregate will be used in the mix, what is the percentage of fine aggregate that will give a resulting minus 0.075 mm in the mixture in the middle of the range, about 4%?
Using the following data for an unreinforced PCC Pavement slab: ▪ Design Strength f`c = 4000 psi ▪ Slab thickness = 12” ▪ Standard deviation of f`c obtained from 20 samples = 200 psi ▪ Ignore any exposure requirement ▪ Use air entrained concrete ▪ Fineness Modulus of Fine Aggregates = 2.60 ▪ Maximum aggregate Size = 2” and nominal maximum aggregate size 1 ½ “ ▪ Bulk oven-dry specific gravity of Coarse Aggregate = 2.60 ▪ Oven-dry rodded density of coarse aggregate = 125 pcf Find the following: a) Required compressive strength b) Water-Cement Ratio c) Coarse aggregate amount (lb/yd3 ) d) If the w/c ratio is 10% reduced, will the quantity of coarse aggregate increase, decrease or remain the same? Explain your answer.
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