Flexible pavement in rural interstate highway.Design ESAL 3000000Subbase exposed to moisture saturation 5% of time & drainage quality is fair.Base saturation level 10% of time (Fair drainage quality).Mr (HMA) 420,000 psiMr (base) 24,000 psiMr (subbase) 10,000 psiCBR (Subgrade) = 1.0Reliability Level R = 85%So 0.45APSI = 2Required: 1) Design the pavement by the AASHTO method2) If the total traffic reaches double, what is the percent of the slab thickness increased

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Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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an interstate highway pavement composed of a hma surface course, a cement treated base course, and a sand–gravel subbase is to be designed for an esal of 1.2*10^6.the quality of drainage is considered fair because water can be removed from the subbase within a week. however, there is a large amount of precipitation, so more than 25% of the time the pavement will be exposed to moisture levels approaching saturation. the material properties are as follows: effective roadbed soil resilient modulus = 5,500 psi, resilient modulus of subbase = 15,000 psi, unconfined compressive strength of cement-treated base at 7 days = 500 psi, and resilient modulus of hma = 4.3*10^5 psi. assuming a minimum thickness for hma, determine the thicknesses of the surface, base,and subbase courses required. Assuming a minimum thickness for HMA, determine the thicknesses of the surface, base,and subbase courses required.
For the following temperature conditions, calculate the proper PG grade for both 50% and 98% reliabilities (show your calculation).Seven-day maximum pavement temperature of 48°C with a standarddeviation of 2.5°C. Minimum pavement temperature of -21°C with a standard deviation of 3°C.
! ᎢᏃᏙᎰ © True Gap graded aggregate improve workability False True Admixtures improve workability of hardened concrete False Slabs 10:53 ص * Cold joints happen in Pavements docs.google.com Beams. Deep pours Asiacell .. *
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Problem Exercise: A concrete road 15m wide, 5 km long, is designed with a thickness as shown in the following cross section. Specifying Class A concrete, determine the quantity of 40 kg cement, sand and gravel required. Use 40kg cement bags. 0.2 m 0.2 m 0.2 m 0.25 m 0.2 m
Enumerate the construction methodology of Portland Cement Concrete Pavement (PCCP) and briefly dicuss it.
Calculate the following values using the one-layer equation Delta_{x} = (p(1 + mu) * a)/E_{1} * [z/a * A + (1 - mu) * H] for the flexible pavement conditions indicated in Figure a. A at point m b. σ, and e, at point o c. 1,2,3 and Tax at point p Since the surface deflection is required, for the one-layer assumptions noted, A= A, (since-A,, = 0).
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Cement Test Results: Tests Weight of w/c ratio Water weight Results Cement Consistency Test 350gr 0.3 105gr 7mm penetration from the bottom Initial setting time 350 gr 0.3 105gr 57 minutes Final setting time350gr 0.3 105gr 2 hours and 57 minutes Fineness test 50gr 0.16% < 0.20% ok Soundness test No such expansion were taken place
Plz, solve this proboem. Transportation Engineering-2 Estimate what standard PG asphalt binder grade should be selected if the seven-day maximum pavement temperature has a mean of 680 C and a standard deviation of 2.50 C. The minimum pavement temperature has a mean of -220 C and a standard deviation of 30 C. Use a Reliability level of 99 %. Note: seven-day maximum and minimum pavement temperatures are normally distributed (use cumulative standard normal distribution tables)
A trial mix is required for a pavement slab being constructed exposed to freezing and thawing as well as deicing agents . The trial mix design strength is 32 MPa (including overdesign) with a 75 mm slump. For the sand; FM = 2.80 and its absorption is 1.5%. The coarse aggregate has a nominal maximum size of 25 mm with an absorption of 1.6% and a dry rodded density of 1460 kg/m3. Determine the mix design amounts for the concrete if the coarse aggregate contains 6% water. (keep all calculations and answers to one decimal place except where indicated. That is, round to one decimal place) Design Water = kg/m3 Water to Cement (W/CM) ratio = (two decimal places) Cement Content = kg/m3 Volume of coarse aggregate per unit volume of concrete = (two decimal places) Estimated total mass of concrete = kg/m3 Design mass of coarse aggregate = kg/m3 Actual mass of coarse aggregate = kg/m3 Actual mass of fine aggregate = kg/m3 Actual mass of water added = kg/m3

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