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Reinforced Concrete Works > Concrete > Flashcards

Concrete Flashcards

1
Q

3 Structural Concrete

A

Plain concrete, Reinforced Concrete and Pre-stressed Concrete

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2
Q

Concrete without steel bars

A

Plain Concrete

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3
Q

Plain concrete is used in

A
  1. slabs-on-grade
  2. pavement
  3. basement walls
  4. small foundations
  5. Curb and gutter
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4
Q

Concrete with steel bars

A

Reinforced concrete

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5
Q

Properly placed reinforcement in concrete improves its

A

Compressive Strength and
Tensile Strength

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6
Q

CONCRETE INGREDIENTS:

A

1.Water
2. Cement
3. Aggregates (Sand & Gravel)
4. Additives (Optional)

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7
Q

These materials are mix in a measured amount to make a workable concrete, that
is easy to:

A

a. Transport
b. Place
c. Compact
d. Finish

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8
Q

binds aggregates such as sand and gravel or crushed
stone, which turn into a rock like mass especially if properly constructed.

A

Cement-water mixture

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9
Q

is the chemical reaction when cement and water are mix
together.

A

Hydration

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10
Q

Portland cement is usually made of materials:

A
  1. Limestone or marl
  2. Shale or clay
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11
Q

CLASSIFICATION OF CEMENT

A
  1. Hydraulic Cement
  2. Non-Hydraulic Cement
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12
Q

are those which harden by hydration in the presence of
water.

A

Hydraulic Cement

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13
Q

will harden with the help of carbon dioxide (CO2
) from
the air.

A

Non-hydraulic Cement

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14
Q

TYPES OF CEMENT

A

Type I - Ordinary Portland Cement
Type II - Modified Portland Cement
Type III - High-Early-Strength Portland Cement
Type IV - Blast Furnace
Type V - Portland Pozzolan Cement
Type VI - High Alumina Cement
Type VII - Quick Setting Cement
Type VIII - Sulphate Resisting Cement
Type IX - White Cement
Type X - Colored Cement
Type XI - Air Entraining Cement
Type XII - Expansive Cement
Type XIII - Hydrophobic Cement

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15
Q

Type I - Ordinary Portland Cement is used for:

A
  1. Highways
  2. pavements
  3. sidewalks
  4. buildings,
  5. bridges
  6. masonry units
  7. soil-cement mixtures
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16
Q

Type II -Modified Portland Cement is used for:

A
  1. Large piers
  2. heavy abutments,
  3. heavy retaining walls,
  4. when the concrete is placed in warm weather
  5. drainage structure
17
Q

Type III - High-Early-Strength Portland Cement is used for:

A
  1. when superior strength is required in a short time
  2. In cold-weather construction
  3. when forms are to be removed immediately
18
Q

Type IV - Blast Furnace Cement

A

is used for structures designed to resist chemical attack

19
Q

Type V - Portland Pozzolan Cement

A

is a low hardening characteristics concrete cement

20
Q

Type VI - High Alumina Cement is used for:

A

is used for high temperature, frost and acidic action

21
Q

Type VII - Quick Setting Cement

A

is used for underwater construction, rainy and cold weather conditions, and also in higher temperature where water evaporates easily

22
Q

Type VIII - Sulphate Resisting Cement is used for

A

construction in contact with soil or groundwater

23
Q

Type IX - White Cement is used for

A

for decorative work

24
Q

Type X - Colored Cement is used for

A

use for different decorative work

25
Q

Type XI - Air Entraining Cement is used for

A

where temperature is very low

26
Q

Type XII - Expansive Cement is used for

A

construction of the pre-stress concrete component

27
Q

Type XIII - Hydrophobic Cement is used for

A

construction of water structures such as dams, spillways, or other submerged structures

28
Q

portland cement is a ________ that must be protected from dump air or moisture

A

moisture-sentive material

29
Q

most types of portland cement are ship in bulk by

A

rail, truck, or barge

30
Q

Followings are the different situations against which precautions are to be taken

A
  1. moisture content at place of storage
  2. duration of cement storage
  3. place of cement storage
  4. arrangement of cement bags
  5. withdrawal of cement bags
31
Q

improves finest quality of long periods stored cement and make it fit for the constructional purpose

A

Vibro-grinding

32
Q

a wooden platform of height is required to avoid direct contact between floor and cement bags

A

150 to 200mm

33
Q

the cement stack should not touch the walls of the shed and it should be considerably ___ away from the external walls

A

300mm

34
Q

Aggregates properties:

A
  1. Strong
  2. Durable
  3. Chemically inert
  4. Occupy 60% to 70% of the concrete mix in volume
35
Q

Sources of Aggregates

A

Natural Aggregate
Crushed Aggregate

36
Q

Classification Of Aggregates

A

Coarse Aggregates
Fine Aggregates

37
Q

Kinds of Additive

A
  1. Airi-entraining agents
  2. Retarders
  3. Accelerator
  4. Plasticizers and Super lasticizers
  5. Pigments
  6. Fly Ash
  7. Ground granulated blast-furnace slag
  8. Silica Fume

Reinforced Concrete Works (5 decks)

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