Brittle materials (as comparted to ductile materials) are characterized by... - correct answer ✔✔Higher
stiffness
Small strain at failure
Low fracture energy
True/False: In a creep test, strain is measured with time under constant load. - correct answer ✔✔True
True/False: Viscoelastic materials must be modeled by combinations of springs and dashpots to
represent instantaneous and time-dependent behavior, respectively. - correct answer ✔✔True
True/False: A Kelvin model (spring and dashpot in parallel) sustains permanent deformation on
unloading. - correct answer ✔✔False
True/False: A Burgers model [Maxwell (spring & dashpot in series) and Kelvin (spring & dashpot in
parallel) in series] exhibits stress relaxation in a relaxation test. - correct answer ✔✔True
Has a lower matrix of volumetric concentration 20%
, Sources of variability for properties measured in this course include... - correct answer ✔✔Testing
Material
Sampling
What are the three most commonly used aggregate types for large-particle composites in civil
engineering? - correct answer ✔✔Igneous
Sedimentary
Recycled Pavements
Definition of aggregate gradation: - correct answer ✔✔Particle size distribution
What is the smallest sieve size used for large-particle composites? - correct answer ✔✔#200 or .075mm
List Interparticle Friction tests for aggregates: - correct answer ✔✔Coarse Test(s):
Coarse Agg. Angularity (CAA), Flat & Elongated
Fine & Coarse Test(s):
Agg. Imaging System (AIMS)
List durability tests for aggregates: - correct answer ✔✔Coarse Test(s):
Los Angeles Abrasion (LAA), Soundness, Quick Chemical Test
Fine Test(s)
Sand equivalent
List the gradation tests: - correct answer ✔✔Wet sieve analysis
Dry sieve analysis
Fineness Modulus (FM)
Sieve Chart
Give the desired parameters for the following:
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