The optimum asphalt content as a percentage of the total mix.

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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.

Answer 1

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Chapter 18, Problem 12P

To determine

The optimum asphalt content as a percentage of the total mix.

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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.

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

As part of mix design, a laboratory-compacted cylindrical asphalt specimen is weighed for determination of bulk-specific gravity. The following numbers are obtained:Dry mass in air = 1264.7 gramsMass when submerged in water = 723.9 gMass of saturated surface dry (SSD) = 1271.9 ga. What is the bulk-specific gravity of the compacted specimen (Gmb)?b. If the maximum theoretical specific gravity of the specimen (Gmm) is 2.531, what would be the air void content of the specimen in percent?