A pavement engineer is attempting to study the effect of adding polypropylene (PP) to asphalt concrete. The engineer claims that PP can improve the strength of asphalt concrete. Results of indirect tensile strength tests on asphalt concrete samples with and without PP are shown in Table 1. Do you agree with the engineer's claim? Table 1: Results of indirect tensile strength tests on asphalt concrete (AC) without and with polypropylene (PP) as an additive Test 1 2 3 4 5 6 7 8 9 10 11 12 Indirect Tensile Strength (MPa) AC Without PP 0.93 1.02 0.87 0.95 1.04 1.12 0.78 0.65 1.07 0.99 0.87 1.08 AC With PP 1.23 1.06 0.89 1.05 1.30 1.56 0.87 0.76 1.34 1.22 0.98 1.15

A pavement engineer is attempting to study the effect of adding polypropylene (PP) to asphalt concrete. The engineer claims that PP can improve the strength of asphalt concrete. Results of indirect tensile strength tests on asphalt concrete samples with and without PP are shown in Table 1. Do you agree with the engineer's claim? Table 1: Results of indirect tensile strength tests on asphalt concrete (AC) without and with polypropylene (PP) as an additive Test 1 2 3 4 5 6 7 8 9 10 11 12 Indirect Tensile Strength (MPa) AC Without PP 0.93 1.02 0.87 0.95 1.04 1.12 0.78 0.65 1.07 0.99 0.87 1.08 AC With PP 1.23 1.06 0.89 1.05 1.30 1.56 0.87 0.76 1.34 1.22 0.98 1.15

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

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
Q. 3 a) Distinguish clearly between hot-mix asphalt and warm-mix asphalt. Why is the latter set to become the mix of the future in asphalt pavement works? b) Explain why asphalt concrete samples from the hot-mix plant are taken for compaction in the laboratory during asphalt overlay construction. c) The following data was taken from a laboratory work sheet on the design of asphalt concrete by the Superpave procedure for a selected aggregate structure: Trial Mix 1 %Gmm@Ndegn=96%, Qam=2470kg/m Trial Mix 2 P.=5.0%, Gmb@Nasgn=2.305 Based on the data, determine the following: i. P, of Mix 1 11. VMA of Mix 1 111. Gmm of Mix 2 Take Ga =2.65, G=2.69, for the aggregates and G,=1.02 for the bitumen used.
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.
During construction of the surface layer of asphalt pavement, two samples were taken every day to measure the asphalt content in the mix to ensure that it is within the specification limits. The target value was set at 5.5% with a tolerance of ±0.4%. The asphalt content data shown in Table P1.41 were collected: a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data show- ing the target value and the upper and lower specification limits. Are the asphalt content data within the specification limits? Comment on any trend and possible reasons. TABLE P1.41 Date Asphalt Content, % Date Asphalt Content, % Oct. 15 Oct. 15 Oct. 16 Oct. 16 Oct. 17 Oct. 17 Oct. 18 Oct. 20 Oct. 20 Oct. 21 Oct. 21 Oct. 22 5.7 5.3 5.8 5.6 5.3 5.8 5.4 5.1 5.7 5.8 5.7 Oct. 22 5.9 5.6 Oct. 23 5.1 Oct. 18 5.8 Oct. 23 6.2 Oct. 19 5.4 Oct. 24 5.2 Oct. 19 5.5 Oct. 24 4.8
List the typical four types of materials in pavement engineering and describe the three basic structures of asphalt mixture in civil engineering.
BMD revolves around the concept of balancing rutting and cracking of the mix. The figure below applies to all three different BMD methodologies. Using your own words explain all different components of this figure, how BMD is achieved, and what different tests and parameters are used to assess the asphalt mixes cracking and rutting performance. Submit your solution in a word file (maximum number of words allowed: 800) Cracking Durable Min Max Rinder Content Stable Rutting
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
1. Answer the following questions based on the practical work done in class: a) Based on the experiment done in class: Explain the nature of the concrete mix and state the type of slump observed. Explain what effects bleeding and settlement may have on a concrete mix. b) Explain what a concrete mix design is. c) What is a concrete road pavement? Where in civil engineering can we find the use of pavement roads. d) Use 2 pictures to show where concrete road pavements are used.
An asphalt pavement has a typical cross-section shown in Figure SPC-802. The maximum permissible stresses of the road materials are as follows: 1. Base allowable bearing pressure Subgrade allowable pressure 0.18 MPa 0.50 MPa Determine the following: Maximum allowable static wheel load, W that can be applied on the surface layer if the radius of contact between tire and pavement is 186 mm. The actual bearing stress induced on the base course layer when subgrade reaches maximum allowable pressure. c. The actual bearing stress induced on the subgrade when a static wheel load of 104 kN is imposed on the pavement. a. b. 50 mm Asphalt Base 180 mm 3.20 m Subgrade Figure SPc-802 Typical Road Cross-Section