A bath plants mixes 6 tons of asphalt mix with an average mixing time of 1.5 minutes. Assuming plant efficiency of 75% what is the plants production in tons per hour?
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A bath plants mixes 6 tons of asphalt mix with an average mixing time of 1.5 minutes. Assuming plant efficiency of 75% what is the plants production in tons per hour?
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- Pane SHORT ANSWER List how high temperature failure of asphalt pavement occurs. Define oxidation in asphalt binder. Explain how asphalt pavement is produced at a drum mixer plant (HMA Production)Aggregate from three sources having bulk specific gravities of 2.90, 2.70, and 2.60 was blended at a ratio of 60:30:10 by weight, respectively. What is the bulk specific gravity of the aggregate bled? Select one: O a. 2.87 O b. 2.81 O c. 2.75 O d. 2.65Q2: A: Name three methods of asphalt pavement recycling. Which one of them is the predominant method? Briefly summarize this method. B: What is the fiber saturation point? What is the effect of the fiber saturation point on the shrinkage of wood in the different directions? How does this phenomenon affect the properties of lumber?
- State four advantages of recycling asphalt pavement materials. Why can we not mix the RAP materials with aggregates in a conventional hot-mix asphalt concrete plant? Show the proper ways of recycling the RAP materials in the two types of hot-mix asphalt plants.. (25 points) A batch plant mixes 80 tons of asphalt mix with an average mixing cycle time of 1 min. Plant efficiency is 90%. Estimate plant production in ton/hr. Assuming that you have a sufficient number of trucks to haul the asphalt to the job site, can this plant keep up with a paver moving at 2mph and laying down a 20’ lane of a highway job that is to be compacted to 6” thickness with a density of 150 lb/cf?1) 7000 gallons of asphalt cement is delivered. The specific gravity of the cement is 0.9515 and the temperature of the cement is 146 °C. Calculate the volume of the cement at 15 °C. 2) 22500 liters of asphalt cement is delivered. The specific gravity of the cement is 0.9870 and the temperature of the asphalt is 117.5 °C. Calculate the volume of the cement at 15 °C. 3) Define the general process of refining Crude oil into asphalt oils. comment on cements, emulsions and cutbacks. (Please use point form) 4) A horizontal cylindrical asphalt tank in a portable asphalt plant has been dipped for measurement of oil remaining in the tank at a job completion. The dipped reading is 1.75 m, the radius of the inside of the tank is 1.35 m, and the length of the tank is 21 m. What is the volume of remaining asphalt oil in the tank in liters? 5) List 5 desired aggregate properties that are used in Asphalt concrete production. Give a brief description of the property 6) What is the general ratio of…
- 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.Describe the two types of asphalt production plants. Compare and contrast. Most large projects use HMA (hot mix asphalt) but sometimes we use cold mix asphalt made from cutbacks. Describe how cold mix asphalt works and what type of projects it is typically used. . Describe the steps for ASTM D4402 3. Explain how asphalt mixes get placed in the field. 9. The NCDOT specified a PG64-28 binder for its new roadway project. You are working in a you material testing lab to provide Quality Assurance for this project. What temperature would conductthe Nominal Maximum aggregate Size (N.M.S) for the aggregate gradation shown below is equal to Sieve size Passing % 3/4 inch 100 1/2 inch 3/8 inch 99 89 No.4 72 No.8 65 No.30 22 No.200 Your answer 4-
- choose the correct answer true false 8-Drum feeder dries the aggregate & blends it with asphalt. * a-T b-F 9-The amounts of aggregate & bituminous materials, determined by weight, are fed into the mixing unit of the plant. * a-T b-F 10- In batch plants asphalt introduced by weight, mixed with aggregates. * a-T b-FTable 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.c8) For the following cements, answer the following questions: Cement A Cement B C3S (%) C2S (%) СЗА (%) Alkalis (%) SO3 (%) СаСОз(%) Blaine fineness (m²/kg) Loss on ignition (%) Insoluble residue (%) *Other aspects of the cements are comparable to each other. 50 20 60 15 10 1 2.5 1 2.5 1 5 350 300 0.01 0.75 3 0.1 d) Which cement has higher sulfate resistance? Briefly explain. e) Which cement is stored improperly? Briefly explain f) During the production of which cement, the kiln reactions were almost complete? Briefly explain