QueAfter two years of traffic, cores were recovered from the roadway which has severe rutting and bleeding. The bulk specific gravity and the maximum theoretical specific gravity were measured on these cores and are as follows: Bulk specific gravity = 2.487 Maximum theoretical specific gravity = 2.561 a. Calculate the air voids b. If the design air void content was 4%, explain what effect the calculated air voids had on the rutting and bleeding noted.

QueAfter two years of traffic, cores were recovered from the roadway which has severe rutting and bleeding. The bulk specific gravity and the maximum theoretical specific gravity were measured on these cores and are as follows: Bulk specific gravity = 2.487 Maximum theoretical specific gravity = 2.561 a. Calculate the air voids b. If the design air void content was 4%, explain what effect the calculated air voids had on the rutting and bleeding noted.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter18: Bituminous Materials

Section: Chapter Questions

Problem 5P: Given the specifications for an asphaltic concrete mixture and the results of a sieve analysis,...

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After 2 years of traffic, cores were recovered from the roadway which has severe rutting and bleeding. The bulk specific gravity and the maximum theoretical specific gravity were measured on these cores and are as follows:a. Bulk specific gravity = 2.487b. Maximum theoretical specific gravity = 2.56 1 c. Calculate the air voidsd. If the design air void content was 4%, explain what effect the calculated air voids had on the rutting and bleeding noted.
1) Compound composition of a Portland cement is given in the table below. What is the type of this Portland cement according to ASTM standard classification? What type of construction work is this Portland cement suitable for and why? Compound composition of PC, % C;S 47 C2S 25 C3A 12 C4AF 9
CRITIC PATK o Na B: A coarse aggregate sample has been collected from a quarry to be used in a surface course asphalt mix, was tested in accordance to the Iraqi specification. The results are as shown below, is it comply with the specification and why? Test Property Percentage of wear, % Degree of crushing,% Flat and elongated pieces, % Soundness test with sodium sulfate, % Results 34 85 7 8
H.W select a mix proportional of 28-day compressive strength (measured on standard cubes) of 56 MPa , slump of 65 mm; uncrushed aggregate with a maximum size of 10 mm; specific gravity of aggregate of 2.64, zone 2 of fine aggregate, repaid setting Portland cement to be used. The percentage absorption of fine aggregate is 1.25% ,and coarse aggregate 2.3% the max. w/c 0.4 and min. cement content 390 kg/m3.
An aggregate blend is composed of 59% coarse aggregate by weight (Sp. Gr.2.635), 36% fine aggregate (Sp. Gr. 2.710), and 5% filler (Sp. Gr. 2.748). Thecompacted specimen contains 6% asphalt binder (Sp. Gr. 1.088) by weight oftotal mix and has a bulk density of 2305 kg/m3 . Ignoring absorption, computethe percent voids in total mix, percent voids in mineral aggregate, and thepercent voids filled with asphalt.
As a materials engineer working for a highway department, what standard PGasphalt binder grade would you specify for each of the conditions shown inTable P9.14 (show all calculations and fill in the table)?
The Superpave volumetric procedure has been widely implemented, with success- ful results. However, the method lacks a strength test to verify the suitability of the Superpave mixes. Research completed in NCHRP Project 9-19 developed "simple performance tests" for asphalt concrete (Witczak et al., 2002), currently called the Asphalt Mixture Performance Tester, AMPT, Figure 9.34. The AMPT is not currently a requirement for Superpave mix design, but implementation studies are underway. In addition, the test method was designed to capture the material properties needed for the Mechanistic Empirical Pavement Design System, MEPDS. The equipment and associated protocols of the AMPT tests are designed to cap- ture the viscoelastic behavior of asphalt concrete. Tests based on measurement of dynamic modulus (for both of permanent deformation and fatigue cracking), flow time (permanent deformation), and flow number (permanent deformation) were selected for further field validation. The three…
An aggregate blend is composed of 59% coarse aggregate by weight (Sp. Gr.2.635), 36% fine aggregate (Sp. Gr. 2.710), and 5% filler (Sp. Gr. 2.748). The compacted specimen contains 6% asphalt binder (Sp. Gr. 1.088) by weight of total mix and has a bulk density of 143.9 lb/ft3 Ignoring absorption, compute the percent voids in total mix, percent voids in mineral aggregate, and the percent voids filled with asphalt.
highway labaratory Marshall Mix Design
Question 1 (1 point) Saved The minimum concrete strength for a side curb on the street in Hamilton, should be 30MPA 25 MPa 32MPA 40MPA Question 2 (1 point) Saved The bulk density is the ratio of the mass of the aggregate to an equalabsolute volume of water True False Question 3 (1 point) Saved Angular aggregate will decrease the void's volume True False Question 4 (1 point) Saved The bulk density of the aggregate includes the voids True False Question 5 (1 point) Saved The nominal size of the aggregate is acceptable if it is equal to 1/3 of the width of the form work the steel bar diameter the concrete cover in normal environment the clear spacing between the steel bars
HW: Determine the average air void of the three asphalt concrete samples with the followings characteristics, then check if the average air void is acceptable by the specification which stated the air void range from 3-5%: Material Fine Filler Asphalt Weight Weight Weight Course agg. agg. cement in air in SSD water Effective specific gravity Percentage in the 2.61 2.63 2.87 1.03 45 46 5 4 mix 1212 Sample 1 Sample 2 Sample 3 1209 697 1206 698 1208 1215 702 1211 31/03/2022 00:10 Lecture 6: Bituminous Mixes 60
Answer 5.29