QUESTION 1 A drum mix asphalt plant is different than a batch mix asphalt plant. O True O False
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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.Describe the two types of asphalt production plants. Compare and contrast. Most large projects use HMA (hot mix asphalt) but sometimes we use cold mix asphalt made from cutbacks. Describe how cold mix asphalt works and what type of projects it is typically used. . Describe the steps for ASTM D4402 3. Explain how asphalt mixes get placed in the field. 9. The NCDOT specified a PG64-28 binder for its new roadway project. You are working in a you material testing lab to provide Quality Assurance for this project. What temperature would conductQ4: Answer the following: 1- Why the solvent in extraction of asphalt test is not neglected? 2- What are the main advantages of Marshall method for design a HMA in Iraq? 3- What are the differences between job mix formula and job mix limits which listed in HMA design report? 4- Discuss the effects of mineral filler on the properties of asphalt mixture? 5- What are the suitable solutions that should be taken if one or more of Marshall asphalt mix properties are not in agreement with specifications limits?
- Instructions: Please provide complete solution for full credit and box final answer/s. Problem: A compacted asphalt concrete specimen has the following properties: Asphalt content = 6.5% by total weight of the mix Bulk specific gravity of the mix = 2.55 Theoretical maximum specific gravity = 2.65 Bulk specific gravity of the aggregate = 2.75Ignoring Absorption, compute the percents' VTM, VMA, and VFA.An aggregate blend is composed of 59% coarse aggregate by weight (Sp. Gr.2.635), 36% fine aggregate (Sp. Gr. 2.710), and 5% filler (Sp. Gr. 2.748). Thecompacted specimen contains 6% asphalt binder (Sp. Gr. 1.088) by weight oftotal mix and has a bulk density of 2305 kg/m3 . Ignoring absorption, computethe percent voids in total mix, percent voids in mineral aggregate, and thepercent voids filled with asphalt.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
- 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%?The mixture maximum specific gravity at 5.0 % asphalt binder content is 2.495. The asphalt specific gravity is 1.030. Compute the aggregate effective specific gravity. Estimate the mixture maximum specific gravity at 6.0 % asphalt binder content.Given below are the requirements of a specification related to the grading of mineral aggregates in an asphaltic concrete mixture and sieve analysis of two aggregates (A and B) that are economically available for this use. Determine the range of blends of aggregates A and B that will produce a combined aggregate that will meet the limits of the specification, and given the grading of the aggregate combinations selected.
- Enlist various steps involved in Marshall Mix Design. Prepare Marshall Mix Design for the asphalt wearing course at OBC of 4.5% as per given gradation? How can you determine Optimum Binder Content? Plot results? Sieve No. 1” ¾” 3/8” #4 #8 #50 #200 pan % Passing 100 90-100 56-70 35-50 23-35 05-12 02-08 -% absorbed asphalt by aggregate(Ps2) equal to zero when none of these O bulk Gagg more than eff Gagg O bulk Gagg less than eff Gagg bulk Gagg and eff Gagg are equalExplain briefly about Viscosity of Asphalt Binder by Rotational Viscometer and what is its significance & use?