The mix design for an asphalt concrete mixture requires 2 to 6% minus0.075 mm. The three aggregates shown in Table P.5.34 are available.TABLE P5.34Minus 0.075 mmCoarse0.5%Intermediate1.5%Fine Aggregate11.5%Considering that approximately equal amounts of coarse and intermediateaggregate will be used in the mix, what is the percentage of fine aggregate thatwill give a resulting minus 0.075 mm in the mixture in the middle of therange, about 4%?

Solution: Given Data: Coarse=0.5%Intermediate=1.5% Fine =11.5% Approximately equal amount of…

Answered: The mix design for an asphalt concrete…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Use the following volumetric relationships for asphalt mix analysis: VTM = 100 (1 - Gmb) VFA = 100 3. An asphalt concrete specimen has the following properties: Asphalt content = 5.5 % by total weigh of mix Bulk specific gravity of the mix = 2.475 Theoretical maximum specific gravity = 2.563 Bulk specific gravity of aggregate = 2.689 Assuming there is no absorption of binder, calculate the following: (a) Percent Voids in Total Mix (b) Percent Voids in Mineral Aggregate: VMA – VTM VMA (c) Percent Voids filled with asphalt: VMA = = (100 - Gmb Ps Gsb
46.5 kg of fine aggregate is mixed with 72.3 kg of coarse aggregate. The fine aggregate has a moisture content of 2.0% and absorption of 3.4%, whereas the coarse aggregate has a moisture content of 1.3% and absorption of 3.8%. What is the amount of water required to increase the moisture contents of both fine and coarse aggregates to reach absorption? Why is it important to determine the amount of water required to increase the moisture content of aggregate to reach absorption?
CapsL 8 A Determine the range of final gradation of selected aggregates to prepare the job mix formula for binder course of a mixing plant according to data indicated in table below? Use the following tolerances: ± 6 % for 4.75 mm and above aggregate sizes, ± 4% for 2.36 and 0.30 mm aggregate sizes, and ± 2 % for 0.075 mm aggregate size. Note: use first try with 30%, 35%, 30% and 5% for groups A, B, C and D, respectively. Sieve Size 25 19 12.5 9.5 4.75 2.36 0.3 0.075 A (30%) Coarse Aggregate 100 99 56 31 4 0 0 0 % Passing B (35%) Natural Sand 100 100 100 100 100 89 15 4.2 C (30%) Crushed Sand 100 100 100 100 92 56 9 5 D (5%) Filler 100 100 100 100 100 100 97 88 Specification 100 90-100 76-90 56-80 35-65 23-49 5 19 39 Job Mix Formula Job Mix Formula Limitation 13.6
The following information is available from a specific gravity test on fine aggregate: wt of SSD sand = 509 g wt of pycnometer plus sand plus water = 2665g wt of pycnometer plus water = 2329 g wt of oven dry sand = 491 g Calculate the bulk specific gravity (SSD), bulk specific gravity, apparent specific gravity, and absorption (dry) of the material.
Table shows the grain size distribution for two aggregates and the specification limits for an asphalt concrete. Determine the blend proportion requiredto meet the specification and the gradations of the blend. On a semilog gradation graph, plot the gradations of aggregate A, aggregate B, the selected blend,and the specification limits.c
Laboratory specific gravity and absorption tests are run on two coarse aggregate sizes, which have to be blended. The results are as follows: Aggregate A: Buck specific gravity = 2.395; absorption = 4.69% Aggregate B: Buck specific gravity = 2.601; absorption = 0.51% What is the specific gravity of a mixture of 50]% aggregate A and 50% aggregate B by weight?
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(c) Table 1 shows the mass of fine aggregates used to conduct a specific gravity test. Calculate the; i) Dry bulk specific gravity ii) SSD bulk specific gravity i) Apparent specific gravity iv) Aggregate absorption. Table 1 Mass of Aggregate 600 g SSD Mass of Aggregate 589 g Mass of pycnometer with water 710 g Mass of pycnometer with water and aggregate 1090 g Mass of aggregate at cool temperature 498 g
If needed assume the unit weight of water to be 62.4 lb/ft3 a) A HMAC sample has the following volumetric properties (i) VMA = 0.1865 ft3and (ii)Volume of air = 0.0452 ft3 Compute %VFA. b) A HMAC sample has 140 lbs of aggregate with a bulk specific gravity of 2.65 and aneffective specific gravity of 2.71. Based on this information the volume of the absorbedasphalt is ________________ft3A compacted sample of hot mix asphalt concrete sample has a unit weight of 135 lb/ft3.c) The sample has an asphalt content of 5% (by weight). Assume no absorbed asphalt.The bulk specific gravity of the aggregate is 2.65, and specific gravity for the asphaltcement is 1.05. Based on this information compute VMA for this mixture.
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