Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 8P
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.
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6. The following table shows the gradation of two
aggregates A and B which are to be blended to
produce an acceptable aggregate for use in
manufacturing asphalt concrete for highway pavement
construction. If the required limits of gradation for
asphalt concrete are shown in the table below,
determine a suitable ratio for blending aggregates A
and B to obtain the acceptable combined aggregate.
Sieve Size
3/4 in. (19 mm)
3/8 in. (9.5 mm)
No. 4 (4.25 mm)
No. 10 (2 mm)
No. 40 (0.425 mm)
No. 200 (0.075 mm)
A
100
80
50
43
20
4
Percent Passing by Weight
B
98
76
45
33
30
8
Required
Mix
96 to 100
65 to 80
40 to 55
35 to 40
15 to 35
5 to 8
Questions 30 is based on the information below:
An asphalt concrete mix design has the following properties. The densities of the binder and aggregate
are 1.090 g/cm³ and 2.760 g/cm³, respectively. The bulk density of the entire mix is 2.220 g/cm³.
The percent binder content is 6.2% (by weight). Assume no absorption.
V₁= 1.0 cm³
Volume
Vv
Vb
Vs
AIR
Binder
Aggregate
Mass
Mb
Ms
Mt
30. As an engineer, you are asked to use this mix design for a 25 kilometer-long section of roadway where
the total pavement width is 8.0 meters and the thickness is 15 centimeters. What is the (a) total volume
of binder and (b) the total volume of aggregate that you would need to purchase? Also, determine the
(c) total %air voids in the mix.
Aggregates from three sources having the properties shown in Table were blended at a ratio of 25:60:15 by weight. Determine the properties of the aggregate blend.
Chapter 18 Solutions
Traffic and Highway Engineering
Ch. 18 - Prob. 1PCh. 18 - Prob. 2PCh. 18 - Prob. 3PCh. 18 - Prob. 4PCh. 18 - Given the specifications for an asphaltic concrete...Ch. 18 - Given the particle size distributions of two...Ch. 18 - Given the particle size distributions of two...Ch. 18 - Given four different types of aggregates to be...Ch. 18 - Prob. 9PCh. 18 - Prob. 10P
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- Aggregates from three sources having the properties shown in the table below where blended at a ratio of 30:45:25 by weight. Determine the properties of the aggregate blend. Aggregates 1 Aggregates 2 Aggregates 3 Properties Coarse aggregate Angularity, percent crushed faces Bulk Specific Gravity |Apparent Specific Gravity 72 86 91 2.75 2.69 2.65 2.87 2.82 2.91arrow_forwardThe maximum theoretical specific gravity of an asphalt concrete is 2.550. Other components are specified as follows: Gmm =a.5s o Apparent Specific Gravity Gma Material Specific Gravity G % by Weight Asphalt cement Limestone dust 6.3 13.7 30.4 1.020 2.820 2.650 2.650 2.650 2.905 Sand Course aggregates 2.873 49.6 9. What is the bulk specific gravity of the aggregates? a) 2.73 b) 2.67 c) 2.69 d) 2.75 Gs b 10. What is the air void content if the bulk specific gravity is of the mixture is 2.340? a) 8.0% b) 8.5% c) 8.6% d) 8.2% 11. What is the effective specific gravity of the aggregates? а) 2.836 b) 2.816 c) 2.826 d) 2.866 12. What is the asphalt absorption? a) 1.90% b) 2.18/% c) 2.23% d) 2.13%arrow_forwardAn asphalt concrete specimen has the following properties:Asphalt content=5.3% by total weight of mixBulk specific gravity of the mix=2.442Theoretical maximum specific gravity=2.535Bulk specific gravity of aggregate=2.703Calculate the percents VTM, VMA, and VFA.arrow_forward
- For the three following stockpiled that used to manufacture HMA, the percent of each aggregate and the bulk specific gravity for each are as follows: Aggregate % of total aggregate GAD A 50% 2.695 B 25% 2.711 C 25% 2.721 The properties of the job mix formula of HMA mixture are: Gmb=2.425, Gmm= 2.521, G,= 1.015, percent of asphalt content (P) = 5% (by mass of the total mix.). Calculate 1) % voids in total mix, 2) % voids in mineral aggregate 3) % voids filled with asphalt.arrow_forwardIn an aggregate mix, the proportions of coarse aggregate, fine aggregate and mineral filter are 55%, 40% and 5%, respectively. The values of bulk specific gravity of the coarse aggregate, fine aggregate and mineral filler are 2,55, 2,65 and 2.70, respectively. The bulk specific gravity of the aggregate mix (round off to two decimal places) isarrow_forwardDiscuss five different desirable characteristics of aggregate used in asphalt concrete.arrow_forward
- An asphalt concrete specimen has the following properties:asphalt content = 5.9% by total weight of mix bulk specific gravity of the mix = 2.457 theoretical maximum specific gravity = 2.598 bulk specific gravity of aggregate = 2.692Calculate the percents VTM, VMA, and VFA.arrow_forwardMax specific gravity of mixture = 2.48 and following details are given. Bulk specific gravity aggregates in the mix and asphalt absorbed (%) are respectively, Material Specific gravity Mix Composition Asphalt Cement 1.02 6.40 Coarse Aggregate 2.51 52.35 Fine Aggregate 2.74 33.45 Mineral filler 2.69 7.80 2.603 and 3.10 2.538 and 2.60 2.603 and 2.08 2.538 and 3.20arrow_forwardThe grading of three aggregates is given below. a) Calculate the percent passing for a combined aggregate which is a blend of 30% (by weight) aggregate A, 45% aggregate B and 25% aggregate C. b) Determine the fineness modulus of aggregate B. c) How much percent of fine aggregate having fineness modulus of 3.00 should be mixed with sample Aggregate B to decrease its fineness modulus to 4.50? % Passing Aggregate B Sieve size Aggregate A Aggregate C Combined Aggregate 1-1/2" 100 3/4" 100 56 3/8" 60 23 # 4 100 40 #8 65 25 #16 45 12 #30 22 #50 11 #100 6. MONSTERarrow_forward
- Samples of coarse aggregate from a stockpile are brought to the laboratory for determination of specific gravities. The following weights are found: Mass of moist aggregate sample as brought to the laboratory: 5,298 grams Mass of oven dried aggregate: 5,216 g Mass of aggregates submerged in water: 3,295 g Mass of SSD (Saturated Surface Dry) Aggregate: 5,227 g Find a. The aggregate bulk dry specific gravity b. The aggregate apparent specific gravity c. The moisture content of stockpile aggregate (report as a percent) d. Absorption (report as percent)arrow_forwardSamples of coarse aggregate from a stockpile are brought to the laboratory for determination of specific gravities and absorption. The following masses were obtained.Mass of moist aggregate = 3,500 gramsMass of oven-dried aggregate = 3,420 gramsMass of aggregates submerged in water = 1,800 gramsMass of SSD aggregate = 3,430 gramsDetermine;a) bulk dry specific gravityb) bulk SSD specific gravityc) apparent specific gravityd) moisture content of stockpile aggregate, in percente) absorption, in percentf) free moisturearrow_forwardThe shape and surface texture of aggregate particles are important for both portland cement concrete and asphalt concrete.a. For preparing PCC, would you prefer round and smooth aggregate or roughand angular aggregate? Briefly explain why (no more than two lines).b. For preparing HMA, would you prefer round and smooth aggregate or rough and angular aggregate? Briefly explain why (no more than two lines).arrow_forward
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