Homework:Determine the proportions of the separate aggregates that will give a gradation within the SCRBwearing coarse specified limits for the aggregates and mix composition for highway pavementasphaltic concrete. The table below shows the results of sieve analysis of samples from thematerials available.بروPercent by WeightPassing SieveDesignationRetainedon SieveDesignationCoarseAggregateFineAggregateMineralFiller3/4 in. (19 mm)1/2 in.5½ in. (12.5 mm)3/8 in.35¾ in. (9.5 mm)No. 438No. 4 (4.75 mm)No. 1017No. 10 (2 mm)No. 405No. 40 (0.425 mm)No. 80No. 80 (0.180 mm)No. 200No. 200 (0.075 mm)Total18111830355263560100100100

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Answered: Homework: Determine the proportions of…

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter18: Bituminous Materials

Section: Chapter Questions

Problem 8P: Given four different types of aggregates to be used to produce a blended aggregate for use in the...

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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%
In concrete work, Fuller and Thompson (1907) suggested that a dense packing of grains can be achieved if the percent finer (p) and grain size (D) are related by the following equation, where n is a constant varying in the range of 0.3-0.6. Dmax is the size of the largest grain within the soil. p=(DDmax)n100 This equation is sometimes used in roadwork for selecting the aggregates. a. For n = 0.5, show that the soil is well graded. b. If n = 0.5 and Dmax = 19.0 mm, find the percentages of gravel, sand, and fines within the soil. Use the Unified Soil Classification System.
According to Figure 5-20, is ii possible to completely separate one of the four materials from the other three? Explain your answer.
Two materials, A and B, are to be separated using two unit operations, 1 and 2. The feed has 10 tons/h A and 4 tons/h B. The split (fraction of material rejected by each operation) is given in Table P5-14. a. Which sequence of operations, (l?2) or (2?1), will yield the greatest recovery of material A? b. What will be the purity of material A using that sequence? c. What will be the efficiency of separation for the entire process train with regard to material A using the Worrell-Stesed equation?
Portland cement concrete consists of what four primary elements?
Three groups of students from the Geotechnical Engineering class collected soil-aggregate samples for laboratory testing from a recycled aggregate processing plant in Palm Beach County, Florida. Three samples, denoted by Soil A, Soil B, and Soil C, were collected from three locations of the aggregate stockpile, and sieve analyses were conducted (see Figure 2.35). (a) (b) Figure 2.35 (a) Soil-aggregate stockpile; (b) sieve analysis (Courtesy of Khaled Sobhan, Florida Atlantic University, Boca Raton, Florida) a. Determine the coefficient of uniformity and the coefficient of gradation for Soils A, B, and C. b. Which one is coarser: Soil A or Soil C? Justify your answer. c. Although the soils are obtained from the same stockpile, why are the curves so different? (Hint: Comment on particle segregation and representative field sampling.) d. Determine the percentages of gravel, sand and fines according to Unified Soil Classification System.

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