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Unit 3 Flashcards

1
Q

A mixture of fine aggregates or sand, coarse aggregates or gravel, cement, water, and/or admixtures.

A

Concrete

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2
Q

Concrete comes from the Latin word ____________ which means _____________.

A

concretus, growing together

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3
Q

In concrete, paste is composed of ________ and __________.

A

Cement and water

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4
Q

In concrete, mineral aggregate is composed of ________ and __________.

A

Coarse Aggregate and Fine Aggregate

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5
Q

The volume of concrete is composed of ______ percent of aggregates.

A

66-78

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6
Q

The volume of concrete is composed of 7-14% ________.

A

Cement

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7
Q

Concrete is composed of _________ percent water.

A

15-20

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8
Q

___________ as the hydrated paste is the binder of concrete.

A

Cement

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9
Q

A cementitious material includes Portland Cement, blended cements, ground granulated blast furnace slag, fly ash, silica fume, metakaolins, and other materials having cementitious properties.

A

Cement

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10
Q

The aggregates give volume to the concrete because they occupy maximum space in the total area of concrete. [True or False]

A

[False]. It gives volume to concrete because they occupy maximum space in the total VOLUME of concrete.

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11
Q

Efforts should be made to use maximum quantity of aggregates as these increase the volumetric stability of concrete and make the mix design more economical. [True or False]

A

True

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12
Q

____________ are what we call on to stones or gravel.

A

Coarse aggregates

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13
Q

____________ is the sand or finer materials that can be found in river, beach and or crushing plants.

A

Fine aggregates

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14
Q

________ is indispensable because it is required for reaction of hydration.

A

Water

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15
Q

Water should be use to maximum considering the requirement for chemical reaction with cement and workability only. [True of False]

A

[False] Water should be RESTRICTED TO MINIMUM AS POSSIBLE considering the requirement for chemical reaction with cement and workability only.

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16
Q

Strength and durability will be adversely affected when water is excessive. [True or False]

A

True

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17
Q

It is used to modify some of the properties of concrete such as setting time, workability or surface finishing characteristics.

A

Admixtures

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18
Q

When storing the cement on small jobs where a shed is not available, bags should be placed on raised wooden platforms at least _______ inches above the ground and water coverings should fit over the pile and extend over the cement and the platform.

A

4 to 6

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19
Q

When storing aggregates, same sizes of aggregates shall be stored in separate bins. [ True or False ]

A

False

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20
Q

Who invented the cement.

A

Joseph Aspdin

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21
Q

_________ are those materials which contributes Silica (SiO3), Alumina (Al2O3) and Iron Oxide (Fe2O3) to the clinker, it includes clay, shale, blast furnace slag, iron ore and sand.

A

Argillaceous Raw Materials

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22
Q

_______________ are those materials which contributes Lime (CaO) and Magnesia (MgO) to the clinker, it includes limestone, chalk, marls, and marine (oyster shells).

A

Calcareous Raw Materials

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23
Q

Clinker + Gypsum = ____________

A

Portland Cement

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24
Q

A material that sets or hardens by chemical reaction with water in air.

A

Hydraulic Cement

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25
A hydraulic cement produced by pulverizing cement clinker and gypsum (calcium sulfate).
Portland Cement
26
A hydraulic cement consisting of two or more inorganic constituents ( at least one of which is not a portland cement of Portland cement clinker) which separately or in combination contribute to the strength gaining properties of the cement.
Blended Cement
27
Adding mineral admixtures such as slag, which is produced as a byproduct of other industrial processes, lowers the energy expenditure in producing overall quantities of OPC by around a ______________.
megawatt per ton
28
A blended hydraulic cement consisting of an intimate blend of portland cement or Portland blast - furnace slag cement and fine pozzolan produced by intergrinding Portland cement clinker and pozzolan, in which the amount of pozzolan constituent is within specified limits.
Portland - Pozzolan Cement
29
For general concrete construction use when the special properties for any other type are not required.
Portland Cement, Type I
30
For general concrete construction, High sulfate resistance cement
Portland Cement, Type V
31
For general concrete construction, Moderate Sulfate resistance or moderate heat of hydration cement
Portland Cement, Type II
32
For general concrete construction, Low heat of hydration cement
Portland Cement, Type IV
33
For general concrete construction, High early strength cement
Portland Cement, Type III
34
For general construction use when the special properties specified for any other type are not required.
White Portland Cement, Type I
35
Primarily used in masonry and plastering construction.
Masonry Cement
36
For general concrete construction use, Moderate sulfate resistant and moderate heat of hydration cement
Portland - Pozzolan, T - IP
37
For general concrete construction not requiring high early strength, sulfate resistant, Low Heat of hydration cement
Slag Cement
38
The condition by which the mortar or concrete starts to develop and gain its strength.
Hardening of Cement
39
The condition by which the cement paste, mortar or concrete mix starts to lose its plasticity and gain a certain degree of rigidity.
Setting of Cement
40
The quantity of heat that are liberated (exothermic) from the reaction of cement with water.
Heat of Hydration
41
It is the chemical reaction that takes place when Portland cement and water are mixed together.
Hydration
42
Specifications of Masonry Cement
AASHTO M 150 (ASTM C 91)
43
Specifications of Portland Cement
AASHTO M 85 ( ASTM C 150)
44
Specifications of Blended Hydraulic Cements
AASHTO M 240 (ASTM C 595)
45
The Owner shall provide suitable means of storing and protecting the cement against dampness. [ True of False ]
False. The CONTRACTOR shall provide ~
46
Cement salvaged from discarded or used bags shall not be used. [ True or False ]
True
47
The compressive strength of mortar samples tested at 7 days can be considered for acceptance of cement quality provided that the strength of the samples at 7 days is not less than _____________ which is _____ of the compressive strength requirement for 28 days (27.6 MPa) when tested in accordance with ASTM C 150).
23.46 MPa, 85%
48
Cement testing is the basis for compliance of physical and mechanical properties with specification requirements. [True of False ]
[False] Cement testing is the basis for compliance of physical and CHEMICAL properties with specification requirements.
49
Cement testing indicates phase composition of clinker and cement use for quality. [ True or False ]
True
50
____________ is the separation of coarse aggregates (stones).
Segregation
51
_____________ is the separation of cement paste from the main mass.
Bleeding
52
Among the various properties of concrete, its compressive strength is considered to be the most important and is taken as an index of its overall quality. [True of False]
True
53
The proper method of handling and placing the fresh concrete contribute to the production of quality concrete. [ True or False ]
True
54
The lower the water-cement ratio, the greater the strength of concrete. [True or False]
True
55
This method covers determination of the density of hydraulic cement.
Standard Method of Test for Density of Hydraulic Cement (AASHTO T - 133 / ASTM C 188)
56
The density of hydraulic cement is defined as the _____ of a unit volume of the solids.
mass
57
Both strength and permeability are influenced by ____________.
fineness
58
Increasing the fineness substantially increase the rate of _____________.
hydration
59
To determine whether or not the hydraulic cement under the test meets the air - entraining or non-air-entraining requirements of the applicable hydraulic cement specification.
Air Content (ASTM C 185)
60
Controls the ability to withstand cycles of freezing and thawing.
Air Content (ASTM C 185)
61
To determine the amount of water required to prepare hydraulic pastes for testing.
Normal Consistency (ASTM C187)
62
_______________ generally assumed to affect concrete workability.
Cement consistency
63
Apparatus use to determine the consistency of the cement.
Vicat Apparatus
64
Measures the penetration resistance of cement paste or mortar.
TIME SETTING Using Vicat Needle
65
__________ refers to the stiffening of the cement paste or the change from plastic state to solid state.
Setting
66
__________ corresponds to a rapid rise and ____________ corresponds to the peak temperature.
Initial set, final set
67
_________ which sometimes occurs within a few minutes of mixing with water.
False set
68
__________ is characterized by the liberation of heat.
Flash set
69
Provides an index of potential delayed expansion caused by hydration of free lime (CaO) or MgO or both.
Soundness Determination by Autoclave Expansion
70
This method is used to determine the compressive strength of hydraulic cement that will be used to determine compliance with specifications.
COMPRESSIVE STRENGTH of Hydraulic Cement mortars using 2-in. or (50mm) Cube Specimen.
71
___________ is the weight percentage lost when Portland cement is heated at 950 ± 50°C. It is added in cement specification to prevent the addition of carbonate minerals such as limestone and dolomite.
Loss On Ignition
72
All Portland Cement contains _________ from silicate impurities of gypsum (CaSO4) added during the final grinding process.
Insoluble Residue
73
It regulates the initial setting and hardening reactions that takes place during hydration.
Sulfur Trioxide (SO3)
74
SO3 above a certain optimum % causes a decrease in strength and an increase in expansion. [True or False]
True
75
A freshly mixed material which can be molded into a shape.
Fresh concrete or plastic concrete
76
Enumerate the apparatus for workability test of concrete
Slump Test Apparatus Kelly Ball Test Apparatus Compaction Factor Apparatus Flow Table Vee Bee Consistometer
77
It means the behavior of the fresh concrete during mixing, handling, delivery, and placement at the point of placing and then during the compaction and finishing of the surface.
Workability
78
Defined as mass of water divided by the mass of cement in a mix.
Water - cement ratio
79
As aggregate surface area decreases, more cement paste is needed to cover the entire surface of aggregates. [True or False]
[False] As aggregate surface area INCREASES, more cement paste is needed to cover the entire surface of aggregates.
80
A measure of the workability of the concrete. It is controlled by the amount of water that is batched into the concrete.
Slump
81
The top portion of the concrete shears off and slips sideways.
Shear Slump
82
The concrete simply subsides, keeping more or less to shape.
True Slump
83
The concrete collapses completely.
Collapse Slump
84
A set of _______________ for structural concrete or a set of __________ for paving concrete shall be obtained for each day of concreting operations.
3 cylinder samples, 3 beam samples
85
A set shall represent ________ or fraction thereof for each class of concrete.
75 cu.m
86
The elapsed time between obtaining the first and final portions of the composite samples shall be a short as possible, but in no instance shall it exceed ____ minutes.
15
87
Sample the concrete at two or more regularly spaced intervals during discharge of the middle portion of the batch. Take the samples within the time limit of 15 minutes and composite them into one sample for test purposes.
Sampling from Stationary Mixers
88
Sample the concrete after the contents of the paving mixer have been discharge. Obtain samples from at least five different portions of the pile and then composite into one sample for test purposes. Avoid contamination with subgrade materials or prolong contact with an absorptive subgrade.
Sampling from Paving Mixers
89
Sample the concrete at two or more regularly spaced intervals during discharge of the middle portion of the batch. Take the samples within the time limit specified for sampling fresh concrete and composite them into one sample for test purposes. In any case do not obtain samples from the first or last portions of the batch discharge.
Sampling from Revolving Drum/Truck Mixers or Agitators

Construction Materials (4 decks)

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