Materials for Civil and Construction Engineers (4th Edition)
Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Chapter 9, Problem 9.40QP

(a)

To determine

The tensile strength of each specimen

(b)

To determine

The average tensile strength of the conditioned and unconditioned specimen.

(c)

To determine

The tensile strength ratio (TSR).

(d)

To determine

Does the mix pass the super pave criteria for the moisture susceptibility.

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Using the AASHTO T 283 test, three HMA specimens were freeze-thaw conditioned and three were unconditioned. All the specimens had a diameter of 150 mm. Table P9.40 shows the thickness and load at failure of each speci- men. Determine: a. The tensile strength of each specimen in MPa. b. The average tensile strength of the conditioned and unconditioned specimens. c. The tensile strength ratio (TSR). d. Does the mix pass the Superpave criteria for moisture susceptibility? TABLE P9.40 Unconditioned Specimens Conditioned Specimens Thickness, mm 64 63 63 63 64 62 Load at failure, kN 11.5 10.5 10.8 9.0 9.5 9.2
A1 Copy the sketch of the tensile stress-strain test (Figure A1) results for a waisted metallic specimen and indicate the locations representing maximum stress (A), ultimate strain to failure (B), and 0.2% proof (yield) stress (C), and calculate the Young's modulus of the material. Figure A1 300 250 200 150 100 50 0 Stress (MPa) 0.2 0.4 0.6 8.0 Strain (%) 10.0
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