Q1) Determine if the results obtained from the laboratory shown in the Table, whether meet the properties of the Asphalt RC-250 specification; if not, note the differences. Property Specification Test Results Kinematic viscosity 250-500 centistokes 260 cs Flash Point Min 27 C(80 F) 75 F Distillate % to 680 F Min 35 To 437 F To 500 F To 600 F 35 Min 60 54 Min 80 75 Residue to 680 F Min 65 64 Ductility at 77 F Min 100 cm 95 cm Absolute viscosity at 140F 600-2400 poises 750 poises Solubility % Min 99.0 95

Q1) Determine if the results obtained from the laboratory shown in the Table, whether meet the properties of the Asphalt RC-250 specification; if not, note the differences. Property Specification Test Results Kinematic viscosity 250-500 centistokes 260 cs Flash Point Min 27 C(80 F) 75 F Distillate % to 680 F Min 35 To 437 F To 500 F To 600 F 35 Min 60 54 Min 80 75 Residue to 680 F Min 65 64 Ductility at 77 F Min 100 cm 95 cm Absolute viscosity at 140F 600-2400 poises 750 poises Solubility % Min 99.0 95

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter18: Bituminous Materials

Section: Chapter Questions

Problem 4P

See similar textbooks

Similar questions

Q4) Determine the PG grade of the asphalt whose results are shown in the table below? Show all calculations and comparisons with Superpave requirements. Test Results Original Properties Flash point temperature, °C 278 Viscosity @ 135 °C 0.490 Pa.s Dynamic shear Rheometer @ 82 °C @ 76 °C G* = 0.82 kPa, 8 = 68° G* = 1.00 kPa, 8 = 64° @ 70 °C G* = 1.80 kPa, 8 = 60° Rolling Thin Film Oven Aged Binder Mass loss, % 0.63 Dynamic shear Rheometer @ 82 °C @ 76 °C G* = 1.60 kPa, 8 = 65° G* = 2.20 kPa, ô = 62° @ 70 °C G* = 3.50 kPa, 8 = 58° Rolling Thin Film Oven and PAV Aged Binder Dynamic shear Rheometer @ 34 °C @ 31 °C @ 28 °C G* = 2500 kPa, 8 = 60° G* = 3700 kPa, 8 = 58° G* = 4850 kPa, 8 = 56° Bending Beam Rheometer @ -6 °C, 60-sec @ -12 °C, 60-sec @ -18 °C, 60-sec S = 255 MPa, m = 0.329 S = 290 MPa, m = 0.305 S = 318 MPa, m = 0.277
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"
Q3) You are required to determine if a certain asphalt can be graded as PG 58 - 28. What agingequipment and testing temperatures should use for the following tests? Explain the rational behind selecting the above testing temperatures.a) Dynamic Shear Rheometer for rutting analysis.b) Dynamic Shear Rheometer for fatigue cracking analysis.c) Bending Beam Rheometer for low temperature cracking analysis.d) Direct Tension Tester for low temperature cracking analysis.
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
Q2) The following results were obtained from testing a certain asphalt binder: RTFO aged PAV Original Asphalt aged asphalt asphalt DSR G° (kPa) 8 (C) 0.98 2.1 6000 75 70 60 BBR S@ 60-sec (MPa) | 300 M@ 60-sec 450 650 0.6 0.5 0.4 DTT Failure Strain (%) 2.5 % 2 % 1.2% Determine if the asphalt meets the Superpave specification requirements to resist the following distresses: (a) Rutting (b) Fatigue cracking (c) Low temperature cracking
An asphalt sample which is claimed to be AC- 20 is tested by an agency. Which test result will reject the sample O Viscosity at 60•C on original sample = 1850 Poise Ductility at 25C on TFO aged sample = 27 cm Penetration at 25 •C = 51 O Viscosity at 60 C on TFO aged sample = 11250 Poise
Determine the allowable number of repetitions N for an asphalt mix which has the design modulus of 3.2 x 10 kPa. The load induced tensile strain at the base of the asphalt beam specimen was 150με. Given, the percentage by volume of bitumen in the asphalt was 10.0, the laboratory to service life fatigue factor was 5, and the project had a desired reliability of 90%. Table 6.16: Suggested reliability factors (RF) for asphalt fatigue Desired project reliability 85% 90% 3.0 3.9 50% 1.0 80% 2.4 95% 6.0 97.5% 9.0
As a materials engineer working for a highway department, what standard PG asphalt binder grade would you specify for each of the conditions shown in Table P9.15 (show all calculations and fill in the table)? TABLE P9.15 Seven-Day Maximum Pavement Temperature Minimum Pavement Recommended Temperature PG Grade Standard Standard 50% 98% Case Mean, °C Deviation, °C Mean, °C Deviation, °C Reliability Reliability 1 39 -32 3.5 54 1.5 -17 2 3 69 2.5
As a materials engineer working for a highway department, what standard PG asphalt binder grade would you specify for each of the conditions shown in Table P9.14 (show all calculations and fill in the table)? TABLE P9.14 Seven-Day Maximum Pavement Temperature Minimum Pavement Recommended Temperature PG Grade Standard 98% Mean, °C Deviation, °C Reliability Reliability Standard 50% Case Mean, °C Deviation, °C 1 43 1.5 -29 2.5 2 51 -18 4 62 2.5 10
(6) Two AC-20 asphalt concrete core samples are taken from an existing flexible pavement. Each sample has a diameter of 4 inches and a thickness of 2.5 inches. (a) If the first sample, tested in the indirect tensile apparatus, failed under a maximum load of 2,500 lbs, calculate the tensile strength of the AC-20 asphalt concrete mixture. (b) Under a dynamic load of 50 lbs, applied on the second specimen in the transducer arrangement for the diametral modulus test, a horizontal recoverable deformation of 0.076*10 inches is measured at 70° F. What is the resilient modulus of the asphalt concrete (AC) layer in the field (use the equation on page 283)?
Electromagnetic technologies offer effective nondestructive sensing techniques for determining characteristics of pavement. The propagation of electromagnetic waves through thematerial depends on its dielectric properties. The following data, kindly provided by the authorsof the article “Dielectric Modeling of Asphalt Mixtures and Relationship with Density” (J. ofTransp. Engr., 2011: 104–111), was used to relate y = dielectric constant to x = air void (%) for18 samples having 5% asphalt content: y <- c(4.55, 4.49, 4.50, 4.47, 4.47, 4.45, 4.40, 4.34, 4.43, 4.43, 4.42, 4.40, 4.33, 4.44, 4.40, 4.26, 4.32, 4.34)x <- c(4.35, 4.79, 5.57, 5.20, 5.07, 5.79, 5.36, 6.40, 5.66, 5.90, 6.49, 5.70, 6.49, 6.37, 6.51, 7.88, 6.74, 7.08)(a) Obtain the equation of the least squares line and interpret its slope.1(b) What proportion of observed variation in dielectric constant can be attributed to the approximate linear relationship between dielectric constant and air void.(c) Does there appear to be…
9.14 As a materials engineer working for a highway department, what standard PG asphalt binder grade would you specify for each of the conditions shown in Table P9.14 (show all calculations and fill in the table)? Table P9.14 Seven-Day Pavement Maximum Minimum Pavement Temperature, °C Temperature, °C Recommended PG Grade 50% 98% Case Mean, °C Std. Dev., °C Mean, °C Std. Dev., °C Reliability Reliability 1 43 1.5 - 29 2.5 2 51 -18 4 3 62 2.5 10 2