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Construction Materials > Unit 3 Part 1 > Flashcards

Unit 3 Part 1 Flashcards

1
Q
  • mixture of fine aggregates or sand, coarse aggregates or gravel, cement, water, and/or admixtures. These materials when properly mixed and proportioned, make a plastic or monolithic form that can be molded into a predetermined size, shape, and volume.
A

Concrete

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2
Q
  • comes from the latin word _________ which means, ____________which is a concise description of the binding of loose particles into a single mass.
A

CONCRETE, ‘concretus’, ‘growing together’

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3
Q

finished product of mixing aggregates with cement and water together with necessary manipulations of placing same and observing curing requirements.

A

CONCRETE

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4
Q

Composition of Concrete

A

Paste
(1)Cement
(2)Water
Mineral Aggregate
(1)Coarse Aggregate
(2)Fine Aggregate
Admixture

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5
Q

Composition by Volume of cement

A

7 - 14%

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6
Q

Composition by Volume of water

A

15 - 20%

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7
Q

Composition by Volume of aggregates

A

66 - 78%

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8
Q

_______________ includes Portland Cement, blended cements, ground granulated blast furnace slag, fly ash, silica fume, metakaolins, and other materials having cementitious properties. _________ as the hydrated paste is the binder of concrete.​

A

Cementitious materilal, Cement

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9
Q
  • give volume to the concrete because they occupy maximum space in the total volume of concrete.
A

Aggregates

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10
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. (T or F)

A

T

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11
Q

Two types of aggregates

A

coarse aggregates and fine aggregates

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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 aggregate

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14
Q

is indispensable because it is required for reaction of hydration. But its use should be restricted to minimum as possible considering the requirement for chemical reaction with cement and workability only.

A

Water

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15
Q

Any excess water is destined for evaporation, leaving capillary-pores in the concrete. (T or F)

A

T

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16
Q

strength and durability will not be adversely affected when water is excessive.​ (T or F)

A

F

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17
Q
  • optional ingredient which is used depending on the specific purpose. 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

It must be noted that admixture should not be used to compensate for bad quality of concrete instead it should be used as a supplement for good construction.​ (T or F)

A

T

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19
Q

To have better uniformity of concrete mix, different sizes of aggregates shall be stored in separate bins or separate stockpiles to prevent the material at the edges of the piles from becoming intermixed. (T or F)

A

T

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20
Q

Who invented the Portland Cement

A

Joseph Aspdin (1824)

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21
Q

What’s the first patented cement?

A

Portland Cement

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22
Q
  • a material that sets or hardens by chemical reaction with water in air.​
A

Hydraulic Cement

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23
Q
  • a hydraulic cement produced by pulverizing cement clinker and gypsum (calcium sulfate).​
A

Portland Cement

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24
Q

Portland cement is composed of

A

Clinker and gypsum

25
Q
  • a hydraulic cement consisting of two or more inorganic constituents (at least one is not portland cement) which separately or in combination contribute to the strength gaining properties of the cement.
A

Blended cement

26
Q

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.​

A

Fact

27
Q

The mineral admixture of blended concrete mix produces the waste products of steel plants and coal power plants, among others. By using this waste in cement, it lowers the demand on other components like limestone, silica and clay, helping to preserve these natural resources.​

A

Fact

28
Q

-a blended hydraulic cement consisting of an​ intimate and uniform 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.​

A

Portland-Pozzolan Cement​

29
Q

Portland-Pozzolan Cement​ is composed of

A

clinker, gypsum, natural pozzolan/ artificial pozzolan

30
Q

One color bond RED COLOR​

For general concrete construction use when the special properties specified for any other type are not required​

A

T1 - Portland Cement

31
Q

​

n/a​

For general concrete construction, Moderate Sulfate resistance or moderate heat of hydration cement​

A

T2- Portland Cement

32
Q

n/a​

For general concrete construction, High early strength cement​

A

T3 - Portland Cement

33
Q

n/a​

For general concrete construction, Low heat of hydration cement​

A

T4 - Portland Cement

34
Q

n/a​

For general concrete construction, High sulfate resistance cement​

A

T5 - Portland Cement

35
Q

​

n/a​

For general construction use when the special properties specified for any other type are not required​

A

White Portland Cement​

T - I​

36
Q

Three color bands BRIGHT YELLOW​

For general concrete construction use, Moderate sulfate resistant and moderate heat of hydration cement​

A

Portland - Pozzolan​

T – IP​

37
Q

​

Two color bands BRIGHT YELLOW​

For general concrete construction use when special characteristics attributed to the larger quantities of pozzolan in the portland-pozzolan cement are not required.​

A

​

Portland - Pozzolan​

​

T – I(PM)​

38
Q

​

​

One color band BRIGHT YELLOW​

For general concrete construction use not requiring high early strength, sulfate resistant, Low Heat of hydration cement​

A

Portland - Pozzolan​

T - P​

39
Q

Two color bands BLUE COLOR​

For general concrete construction, Moderate sulfate resistant and moderate heat of hydration cement​

A

Portland Blast- furnace Slag​

T - IS​

40
Q

One color band BLUE COLOR​

For general concrete construction not requiring high early strength, sulfate resistant, Low Heat of hydration cement​

A

SLAG CEMENT​

T – S​

41
Q

One color band Two color bands Three color bands BROWN COLOR​

​

Primarily used in masonry and plastering construction​

A

MASONRY CEMENT​

T – N​

T – S​

T – M​

42
Q
  • the condition by which the cement paste, mortar or concrete mix starts to lose its plasticity and gain a certain degree of rigidity​
A

Setting of Cement

43
Q
  • the condition by which the mortar or concrete starts to develop and gain its strength​
A

Hardening of Cement​

44
Q

It is the chemical reaction that takes place when portland cement and water are mixed together. The hydration reaction is considered complete at 28 days.​

A

Hydration

45
Q

The quantity of heat that are liberated (exothermic) from the reaction of cement with water.​

A

Heat of Hydration​

46
Q

Basis for compliance of physical and chemical properties with specification requirements.

A

CEMENT TESTING

47
Q

Indicates phase composition of clinker and cement use for quality control.​

A

CEMENT TESTING

48
Q

Determine the effects of chemical properties on concrete performance

A

CEMENT TESTING

49
Q

Provides sufficient information about the chemical properties of hydraulic cements to enable the user to interpret the specifications and understand the technical documentation provided by cement manufactures.

A

CEMENT TESTING

50
Q
  • is not just a matter of mixing different materials to produce a plastic mass, but it has to satisfy quality tests.
A

Concrete making

51
Q
  • is the separation of coarse aggregates (stones).
A

Segregation

52
Q
  • is the separation of cement paste from the main mass.
A

Bleeding

53
Q

Among the various properties of concrete, its ____________ is considered to be the most important and is taken as an index of its overall quality.

A

compressive strength

54
Q

The proper methods of handling and placing the fresh concrete contribute to the production of quality concrete.___________ of the coarse aggregate and _________ in placing the concrete into final position are factors contributing to weak concrete.

A

T, Segregation, improper tamping

55
Q

Proper curing in the production of quality concrete is also of equal importance. Neglect on the part of concrete inspectors in the matter of proper curing especially within the first ______ after concrete is placed, will impair the increase in strength, and the loss suffered within this period can in no way be recovered.

A

72 hours

56
Q

___________ and __________ starting from the design mix up to concrete curing is highly encouraged for materials engineering to be able to minimize these types of common errors.

A

Close monitoring and supervision

57
Q

Factors Affecting Strength/ Characteristics of Concrete​

A

Quality of aggregate and cement​

Quality of mixing water and cement​

Curing conditions​

Time of mixing, and​

Age

58
Q

If the concrete is properly-cured at any certain age, the most significant single factor affecting strength is the ___________________.

A

water- cement ratio.

59
Q

The lower the water-cement ratio, the greater the strength of concrete.

A

T

Construction Materials (5 decks)

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