Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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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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Table shows the grain size distribution for two aggregates and the specification limits for an asphalt concrete. Determine the blend proportion required to 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.
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
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?
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 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.arrow_forwardGiven 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_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
- A compacted asphalt concrete specimen has the following properties: a. Asphalt content = 5% by total weight of the mix b. Bulk specific gravity of the mix = 2.485 c. Theoretical maximum specific gravity = 2.595 d. Bulk specific gravity of the aggregate = 2.715 e. Absorption = 1.5% Compute the percent’s VTM, VMA and VFAarrow_forwardThe table below lists data used in obtaining a mix design for an asphalt paving mixture. If the maximum specific gravity of the mixture is 2.41 and the bulk specific gravity is 2.35, determine: (a) the bulk specific gravity of aggregates in the mix (b) the asphalt absorbed (c) the effective asphalt content of the paving mixture (d) the percent voids in the mineral aggregate VMA. Material Specific Gravity Mix Proportion Asphalt cement 1.02 6.4 Coarse aggregate 2.51 52.35 Fine aggregate 2.74 33.45 Mineral filler 2.69 7.8 (Highway & Engineering Traffic Engineering, SI unit, N. Garber)arrow_forwardAn aggregate blend is composed of 65% coarse aggregate by weight (SG 2.65), 30% fine aggregate (SG 2.70), and 5% filler (SG 2.75). The compacted specimen contains 6% asphalt binder (SG 105) by weight of total mix, and has a bulk densit of 2.255 Mg/m&3. Ignoring absorption.a. What is the percent voids fill with asphalt?b. What is the percent voids in mineral aggregates?c. What is the percent voids in total mix?arrow_forward
- 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, compute the percent voids in total mix, percent voids in mineral aggregate, and the percent voids filled with asphalt.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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