The core densities listed were obtained from a com- pacted asphalt concrete pavement: core A = 142.9 pcf, core B = 149.9 pcf, and core C= 143.4 pcf. Determine the percentage of compaction if the laboratory density of the mix was 147.1 pcf. Do any of the cores indicate potential problems with the pavement?

The core densities listed were obtained from a com- pacted asphalt concrete pavement: core A = 142.9 pcf, core B = 149.9 pcf, and core C= 143.4 pcf. Determine the percentage of compaction if the laboratory density of the mix was 147.1 pcf. Do any of the cores indicate potential problems with the pavement?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The following figure shows concrete pavement with the layer thickness and elastic modulus as indicated. Assume modulus of rupture of 650 psi, load transfer coefficient of 3.2, serviceability loss from 4.5 to 2.5, and drainage coefficient of 0.9. The bedrock depth and loss of support is not considered for the subgrade. Use the design equation or monograph with 50% reliability to solve the following: 1) Determine the number of ESAL that the pavement can carry before failure. 2) If the daily traffic has 1080 single axles (20-kip), 400 single axles (24-kip), and 680 tandem axles (40-kip), and the annul traffic is the same over the design period, how many years would the concrete pavement last before failure? 8-inch Portland Cement Concrete Ec=4×106 psi 8-inch Granular Subbase Ec=30,000 psi Subgrade Mr = 5000 psi
Problem No. 1A flexible pavement for an urban interstate highway is to be designed using the AASHTOmethod to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water tobe drained from within the pavement and the pavement structure will be exposed to moisturelevels approaching saturation for 30% of the time. The following additional information is available: Elastic modulus of asphalt concrete = 450,000 psiResilient modulus of base material = 35,000 psiResilient modulus of subbase material = 15,000 psiCBR of subgrade material = 8(a) Consider designing the same pavement with only asphalt concrete and base layer (excluding subbase layer). Use the information provided in Problem 1. (b) Compare strengths and weaknesses of each design.
Using the following data for an unreinforced PCC Pavement slab:■ Design strength f′c = 28 MPa■ Slab thickness = 300 mm■ Standard deviation of f′c obtained from 20 samples = 1.4 MPa■ Ignore any exposure requirement■ Use air-entrained concrete■ Fineness modulus of fine aggregate = 2.60■ Maximum aggregate size = 50 mm and nominal maximum aggregatesize = 37.5 mm■ Bulk oven-dry specific gravity of coarse aggregate = 2.6■ Oven-dry rodded density of coarse aggregate = 2002 kg/m3Find the following:a. Required compressive strengthb. w/c ratioc. Coarse aggregate amount (kg/m3)d. If the w/c ratio is 10% reduced, will the quantity of coarse aggregateincrease, decrease or remain the same? Explain your answer.
An asphalt binder is intended to be used in a climate with maximum 7-day pavement temperature of 73 •C and minimum pavement temperature of -18•C. Following is the SHRP tests results on the asphalt binder. This asphalt meet the requirements for original binder, _meet the requirements for RTFO aging and meet the requirements for PAV aging Original Binder DSR at 76 °C: G*=0.96 kPa, ô=65• RTFO Aged Binder Mass lost: 0.55 % DSR at 76 °C :G*=1.72 kPa, ô=54• PAV Aged Binder DSR at 31 •C : G*=8520 kPa, ô=37• BBR at -12 °C and 60 sec : Stiffness = 289 MPa , m-value = 0.281 DTT at -12 C : 2.2% does not, does not, does no does not, does, does not does not, does, does does, does, does not
A paving mixture is prepared for surfacing a section of highway as follows; AC-20 asphalt cement, Gs=1.05, total content =6 % by total weight of mixture. Combined aggregate (bulk G) = 2.65, MaxGm=2.5, Marshall density = 2.458 gm/cm³. Determine the relative compaction of pavement necessary for providing VFA-70%. A
Explain why asphalt concrete samples from the hot-mix plant are taken for compaction in the laboratory during asphalt overlay construction
Problem #1 The following figure shows the results from the dynamic modulus test for asphalt mixtures. The specimen is 4" in diameter and 6" in height. The gauge length for the axial LVDT is 4". Time lag is 0.25s. Find |E*I, and phase angle . Axial force(lbf) 65 60 40 20 0 -20 -40 -65 0 Dynamic modulus test result (gauge length = 4") 0.5 Time (second) 1 0.0010 0.0009 0.0006 0.0003 0 force (lbf) disp (in.) -0.0003 -0.0006 -0.0009 -0.0010 1.5 Axial displacement(in) 4"
Flexible road pavement is more popular as compared to concrete road pavement in Malaysia. i) Discuss why flexible road pavement is more popular. ii) Describe one (1) test that is used to measure hardness of bituminous material
A compacted asphalt concrete specimen has the following properties:a. Asphalt content = 5% by total weight of the mixb. Bulk specific gravity of the mix = 2.500c. Theoretical maximum specific gravity = 2.610d. Bulk specific gravity of the aggregate = 2.725 Ignoring absorption, compute the percents VTM, VMA, and VFA.
Q3 The asphalt concrete have been designed with asphalt content 4.8% (Gb= 1.045), and the aggregate characterization (Gsb= 2.66, Gse=2.72). Calculate the volumetric properties of the mixture, if the relative compaction 95% and the lab density of mixture = 2.507gm/cm³