quizzes and surveys total

Question 1

Tensile stresses are induced upon heating a restrained material. T OR F

Answer 1

false

Question 2

Plastic mechanical properties of materials include:
stiffness, yield strength, ductility, possion’s ratio, tensile strength

Answer 2

yield strength, ductility, tensile strength

Question 3

Brittle materials (as compared to ductile materials) are characterized by:

Answer 3

high stiffness, small strain at failure, low fracture energy

Question 4

in a creep test, strain is measured with time under constant load t or f

Answer 4

true

Question 5

Viscoelastic materials must be modeled by combinations of springs and dashpots to represent instantaneous and time-dependent behavior, respectively. t or f

Answer 5

true

Question 6

A Kelvin model (spring and dashpot in parallel) sustains permanent deformation on unloading.
t or f

Answer 6

false

Question 7

A Burgers model [Maxwell (spring & dashpot in series) and Kelvin (spring & dashpot in parallel) in series] exhibits stress relaxation in a relaxation test.
Correct!
t or f

Answer 7

true

Question 8

Asphalt Concrete (as compared to Portland Cement Concrete):

Answer 8

includes interlocked particles, has a lower matrix volumetric concentration 20%

Question 9

Sources of variability for properties measured in this course include:

Answer 9

testing, material,sampling

Question 10

Tensile stresses are induced upon cooling a restrained material. t or f

Answer 10

true

Question 11

Elastic mechanical properties of materials include

Answer 11

poissons ratio, stiffness

Question 12

In a creep test, stress is measured with time under constant deformation. t or f

Answer 12

false

Question 13

A Maxwell rheological model (spring & dashpot in series as shown) exhibits increasing deformation with time in a creep test.

Answer 13

true

Question 14

The type of material failure induced by repeated loading is:

Answer 14

fatigue

Question 15

The strain at failure for brittle materials is lower than for ductile materials.

Answer 15

true

Question 16

A Kelvin rheological model (spring and dashpot in parallel as shown) sustains permanent deformation on unloading in a creep

Answer 16

false

Question 17

The response of a Burgers rheological model (Maxwell and Kelvin models in series as shown) in a creep test to loading is:

Answer 17

instantaneous and time dependent

Question 18

Aggregate types commonly used in civil engineering large-particle composites include:
You Answered

Answer 18

igneous, sedimentary, recycled pavements

Question 19

aggregate gradation is defined as

Answer 19

particle size distribution

Question 20

The smallest size aggregates used in civil engineering large-particle composites is:

Answer 20

filler (passing the #200 or 0.075mm sieve)

Question 21

A coarse aggregate test for interparticle friction is:

Answer 21

CAA

Question 22

a fine aggregate test for durability is

Answer 22

sand equivalent

Question 23

a maximum sand equivalent is specified

Answer 23

false

Question 24

a coarse aggregate test for durability is

Answer 24

soundness, quick chemical test for reactive silica

Question 25

The parameter that combines gradation into a single index value is:

Answer 25

fineness modulus

Question 26

washed sieve analysis

Answer 26

accounts for fines stuck to coarse aggregate particles

Question 27

A drainage layer requires an open aggregate gradation

Answer 27

true

Question 28

fresh CONCRETE properties include

Answer 28

workability, segregation, bleeding

Question 29

hardened concrete properties include

Answer 29

f’c, f’t, stiffness, MOR

Question 30

the most important factor wiht concrete strength is

Answer 30

w/c

Question 31

the following factor level increases long term/late strength concrete

Answer 31

moist curing

Question 32

creep and shrinkage in concrete

Answer 32

-is caused by movement of water in gel pores
-is influenced by amount of C-S-H
-is restrained by aggregate

Question 33

all the following factos decrease creep and shrinkage concrete expect

Answer 33

long time,

Question 34

reinforcing steel is used to increase tensile strength of the composite concrete tor f

Answer 34

true

Question 35

expansive products that cause cracking in concrete include

Answer 35

ettringite, rust, ice, alkali silica gel

Question 36

3 requirements for ASR are

Answer 36

-moisture, reactive silica, alkali