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CE264 > Concrete, Aggregates, Admixtures > Flashcards

Concrete, Aggregates, Admixtures Flashcards

1
Q

of cement is usually measured indirectly by measuring
the surface area with Blaine air permeability.

A

Soundness

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2
Q

Wagner turbidimeter is used to determines the surface area by
measuring the rate of sedimentation of cement suspended in

A

kerosene

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3
Q

Fineness can also be measured by determining the percent
passing the sieve diameter of

A

0.045 mm

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4
Q

Refers to the stiffening of the cement paste or the change from a
plastic state to a solid state

A

Setting

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5
Q

set time must allow for handling and placing the
concrete before stiffening.

A

initial setting

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6
Q

Refers to its ability to retain its volume after setting of the cement
paste

A

Soundness

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7
Q

The autoclave expansion test is used to check the ____ of the
cement paste.

A

Soundness

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8
Q

The acceptance criteria for questionable water are specified in
ASTM __

A

C94

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9
Q

After 7 days, the average compressive strength of mortar cubes
made with the questionable water should not be less than _____
of the average strength of cubes made with potable water.

A

90%

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10
Q

Aggregate particles that are retained on a 4.75 mm sieve (No. 4)

A

Coarse

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11
Q

Aggregate particles that pass a 4.75 mm sieve (No. 4).

A

Fine

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12
Q

One sieve size larger than the nominal maximum aggregate size

A

Maximum size

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13
Q

One sieve larger than the first sieve to retain more than 10% of the
aggregates.

A

Nominal Maximum

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14
Q

Two considerations in the shape of the material: angularity
and_____.

A

flakiness

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15
Q

Referred to as flat and elongated, describes the relationship
between the dimensions of the aggregate.

A

Flakiness

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16
Q

It is desirable to use rounded and smooth aggregates to improve
the ____ of fresh concrete during mixing.

A

workability

17
Q

Angular and rough particles are desirable for asphalt concrete and
base courses to increase the ____of the materials in the field.

A

Stability

18
Q

The Superpave mix design method recognizes an angularity test,
Test Method for Uncompacted Void Content. A test for ___.

A

Fine

19
Q

The ability of aggregate to withstand weathering is defined as ___.

A

Toughness

20
Q

The ability of aggregates to resist the damaging effect of loads is
related to the ____of the aggregate particles and is described as
abrasion resistance.

A

hardness

21
Q

The aggregate may have some moisture but the saturation state is
not quantified.

A

air dry condition

22
Q

The aggregate contains no moisture; this requires drying the
aggregate in an oven to a constant mass.

A

Bone dry

23
Q

Defined as the moisture content in the SSD condition

A

Absorption

24
Q

The aggregate’s voids are filled with moisture but the main surface
area of the aggregate particles is dry

A

(SSD) condition

25
Q

The moisture content in the aggregate in excess of the moisture
content in the SSD condition.

A

Free moisture

26
Q

Field samples must be reduced using the following except:

A

slump

27
Q

There are four major reasons for using admixtures except:

A

to substitute the quality of aggregates in the concrete mix

28
Q

This admixture is recommended for all concrete exposed to
freezing.

A

Air entraining

29
Q

When superplasticizers are used, the fresh concrete stays
workable for a short time, _____ minutes, and is followed by
rapid loss in workability.

A

30-60mins

30
Q

Advantages of retarding admixtures except

A

increase the time between the initial and final set

31
Q

an ultrafine gray powder, binds sand and
rocks into a matrix
of
concrete.

A

Cement

32
Q

A cement which possesses
the property of hardening
in combination with water

A

HYDRAULIC CEMENT

33
Q

It is the product obtained by pulverizing
clinker consisting of hydraulic calcium
silicates

A

Portland Cement

34
Q

Hydrates
and hardens rapidly and is largely
responsible for initial set and
early strength.

A

Tricalcium silicate

35
Q

Hydrates and hardens
slowly and is largely
responsible for strength
increases beyond one week.

A

Dicalcium silicate

36
Q

Hydrates
and hardens the quickest.

A

Tricalcium aluminate

37
Q

___ undergo a series of chemical
reactions that cause it to harden or set.

A

Hydration

38
Q

a siliceous and aluminous
material in finely divided form react with
calcium hydroxide at ordinary
temperatures to form compounds having
cementitious properties.

A

Pozzolan Cement

39
Q

Apperance of water on the surface of the
concrete after it has consolidated but
before it is set.

A

Bleeding

CE264 (5 decks)

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