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CE264 > Quiz 2 > Flashcards

Quiz 2 Flashcards

1
Q

Properties of the hardened concrete
important to the materials engineer are:

A
  • Strength
  • Modulus of Elasticity
  • Durability
  • Porosity
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2
Q

is generally the controlling design
factor. Unless otherwise specified, concrete
strength f′c refers to the average
compressive strength of three tests.

A

Strength

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3
Q

is
desired for mixes with low cement content to
promote workability.

A

Low Fineness Modulus

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4
Q

is defined as the ease of
placing, consolidating, and finishing freshly
mixed concrete.

A

Workability

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5
Q

is an indicator of
workability when evaluating similar
mixtures. This test consists of filling a
truncated cone with concrete, removing
the cone, then measuring the distance
the concrete slumps (ASTM C143).

A

Slump Test

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6
Q

is measuring and introducing the concrete
ingredients into the mixer.

A

Batching

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7
Q

is
mixed in a central plant
and delivered to the job
site in mixing trucks
ready for placing.

A

Ready-mixed Concrete

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8
Q

3 mixing methods can be used for
ready-mixed concrete:

A
  1. Central-mixed concrete
  2. Shrink-mixed concrete
  3. Truck-mixed concrete
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9
Q

is mixed
completely in a stationary mixer and
delivered in an agitator truck (2 rpm to 6
rpm).

A

Central-mixed concrete

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10
Q

is partially mixed
in a stationary mixer and completed in a
mixer truck (4 to 16 rpm).

A

Shrink-mixed Concrete

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11
Q

is mixed
completely in a mixer truck (4 to 16 rpm)

A

Truck-mixed Concrete

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12
Q

It can be mixed in a mobile
batcher mixer at the job site.

A

Mobile Batcher Mixed Concrete

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13
Q

should be
deposited continuously as close as possible
to its final position.

A

Depositing Concrete

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14
Q

is frequently used for large
construction projects. Special pumps deliver the concrete directly into the forms.

A

Pump Concrete

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15
Q

Quality concrete requires thorough
consolidation to reduce the entrapped air
in the mix

A

Vibration of Concrete

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16
Q

The pressure
method is based on _______, which
relates pressure to volume.

A

Boyle’s Law

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17
Q

compares the unit weight of freshly mixed
concrete with the theoretical maximum
unit weight of the mix.

A

Gravimetric Method

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18
Q

can be used
for concrete made with any type of
aggregate. The basic process involves
placing concrete in a fixed volume
cylinder

A

Volumetric Method

19
Q

is a
quick method used to determine the air
content of freshly mixed concrete

A

Chace Air Indicator Test

20
Q

is the process of maintaining
satisfactory moisture content and
temperature in the concrete for a definite
period of time.

A

Curing

21
Q

is a
long-term process and requires water and
proper temperature.

A

Hydration of Cement

22
Q

involves covering the exposed
surface of the concrete structure with
water.

A

Ponding

23
Q

A system of nozzles or sprayers can provide
continuous spraying or fogging This
method requires a large amount of water
and could be expensive. It is most suitable
in high-temperature and low humidity envi
ronments.

A

SPRAYING / FOGGING

24
Q

Moisture-retaining fabric coverings saturated
with water, such as burlap, cotton mats, and
rugs, are used in many applications

A

Wet Coverings

25
Q

which is the most common technique
for evaluating workability acrossthe world.

A

Slump Test

26
Q

is better suited for adequately measure
the workability of stiff and dry mixes.

A

Vee Bee Test

27
Q

a given
volume of concrete undergoes free fall from
one hopper to the second, and then into a
cylindrical container.

A

Compaction Factor Test

28
Q

involves the spread of a
truncated cone of concrete on a table that is
dropped a number of times.

A

Flow Table Test

29
Q

is a quality index, because
its correlates with other characteristics
as: compaction, mechanical strength,
permeability, freeze – thaw resistance
and etc.

A

Specific Weight

30
Q

It is considered only when it is required as
a necessity in the design project that
establishes the maximum and minimum
valuesfor concrete temperature.

A

Temperature

31
Q

defined as the largest stress that does
not cause a measurable permanent
strain.

A

Elastic Limit

32
Q

is commonly used in designing concrete
structures. Since the stress-strain relationship is not exactly linear, the classic definition of the
modulus of elasticity (Young’s modulus) is not
applicable.

A

Modulus of Elasticity

33
Q

s used in advanced structural
analysis of shell roofs, flat-plate roofs, and mat foundations. Poisson’s ratio of concrete varies between 0.11 and 0.21,

A

POISSON’S RATIO

34
Q

is an important property of
concrete because concrete structures are
highly vulnerable to tensile cracking due to
various kinds of effects and applied loading
itself.

A

Tensile Strength

35
Q

is used to evaluate the shear resistance provided by concrete in reinforced lightweight
aggregate concrete members.

A

Split Tensile Strength

36
Q

measures the
tensile strength of concrete. In this test, a 0.15-m by 0.30-m (6-in. by 12-in.) concrete cylinder is subjected to a compressive load at a constant rate along the vertical diameter until failure.

A

SPLIT TENSION TEST

37
Q

The specimen is prepared
either in the lab or in the field in accordance with ASTM C192 or C31, respectively.

A

FLEXURE STRENGTH TEST

38
Q

It is a measure of an unreinforced concrete
beam or slab to resist failure in bending.

A

Flexture Strength

39
Q

also known as the Schmidt hammer test, is a
nondestruc tive test performed on hardened
concrete to determine the hardness of the
surface

A

Rebound Hammer Test

40
Q

also known as the Windsor Probe test, is standardized by ASTM C803.

A

PENETRATION RESISTANCE TEST

41
Q

measures the
velocity of an ultra sonic wave passing through the concrete. This test is used to detect cracks, discontinuities, or internal deterioration in the structure of concrete.

A

ULTRASONIC PULSE VELOCITY TEST

42
Q

is defined as the degree of cement hydration, which varies as a function of both time and
temperature.

A

Maturity

43
Q

an ultimate strength pertaining to the
failure of beams by flexure equal to the
bending moment at rupture divided by the
section modulus of the beam

A

Modulus of Rupture

CE264 (5 decks)

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