Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 18, Problem 11P
To determine
The optimum percentage of asphalt, if the asphaltic content is specified as 5 to 7 percent for hot-mix, hot-laid asphaltic concrete mixture.
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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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- Given the specifications for an asphaltic concrete mixture and the results of a sieve analysis, determine the proportion of different aggregates to obtain the required gradation. Coarse aggregates: 60% Fine aggregates: 35% Filler: 5%arrow_forward1) Solve these: a) For hot-mix, hot-laid asphaltic concrete mixtures, if the asphaltic content is specified as 5 to 7 percent, how is the optimum percentage determined? b) Discuss the factors to consider in producing a rapid-curing cutback asphaltic materialarrow_forward3) The design of a concrete mix requires 1173 kg/m3 of gravel in dry condition, 582 kg/m3 of sand in dry condition, and 157 kg/m3 of free water required. The gravel available at job site has a moisture content of 0.8 % and absorption of 1.5 %, and the available sand has a moisture content of 1.1 % and absorption of 1.3 %. Determine: - the masses of gravel, sand and water per cubic meter that should be used at job site and the theoretical unit weight of the mix. - Assume that the same volume of dry coarse aggregate was replaced by dry lightweight aggregate of low bulk specific gravity (0.6 g/cm3) and M=5%, A=5%. What would be the new theoretical unit weight ?arrow_forward
- Why angular and rough aggregate is good for Asphalt concrete? Explain the answer by relating the texture to other properties of aggregate.arrow_forwardWhy is it important to have optimum binder content in asphalt concrete?What would happen if a less-than-optimum binder content is used? Whatwould happen if more than the optimum value is used? What is the typicalrange of binder content in asphalt concrete?arrow_forwardAn 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). The compacted specimen contains 6% asphalt binder (Sp. Gr. 1.088) by weight of total mix and has a bulk density of 143.9 lb/ft3 Ignoring absorption, compute the percent voids in total mix, percent voids in mineral aggregate, and the percent voids filled with asphalt.arrow_forward
- 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%?arrow_forwardE 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 D857arrow_forwardQ3) 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.arrow_forward
- 1. Following data are given for designing a Portland cement concrete mix for a nonstructural sidewalk slab: • Design strength f´c= 26 MPa• Standard deviation of f´c obtained from 25 tests=1.4 MPa• Freezing and thawing and exposed to chlorides• Use air entrained concrete• Slab thickness= 300 mm• Fineness modulus of fine aggregate=2.7• Maximum aggregate size=50 mm and nominal maximum aggregate size=37.5mm• Bulk oven-dry specific gravity of coarse aggregate=2.6• Oven-dry rodded density of coarse aggregate=2002 kg/m3• Type I cement, relative density=3.1 Find the following:a) Required compressive strength b) w/c ratio c) Coarse aggregate amount (kg/m3) d) If the w/c ratio is 10% reduced, will the quantity of coarse aggregate increase, decrease or remain the same? Explain your answer.arrow_forwardQ1. The design of a concrete mix requires 1173 kg/m³ of gravel in dry condition, 582 kg/m³ of sand in dry condition, and 157 kg/m³ of free water. The gravel available at the job site has a moisture content of 0.8% and absorption of 1.5%, and the available sand has a moisture content of 1.1% and absorption of 1.3%. What are the masses of gravel, sand, and water per cubic meter that should be used at the job site?arrow_forwardA compacted asphalt concrete specimen contains 5% asphalt binder (Sp. Gr. 1.023) by weight of total mix and aggregate with a specific gravity of 2.755. The bulk density of the specimen is 2.441 Mg/m3 Ignoring absorption, compute VTM, VMA, and VFA.arrow_forward
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