Concrete

Question 1

3 Structural Concrete

Answer 1

Plain concrete, Reinforced Concrete and Pre-stressed Concrete

Question 2

Concrete without steel bars

Answer 2

Plain Concrete

Question 3

Plain concrete is used in

Answer 3

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

Question 4

Concrete with steel bars

Answer 4

Reinforced concrete

Question 5

Properly placed reinforcement in concrete improves its

Answer 5

Compressive Strength and
Tensile Strength

Question 6

CONCRETE INGREDIENTS:

Answer 6

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

Question 7

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

Answer 7

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

Question 8

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

Answer 8

Cement-water mixture

Question 9

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

Answer 9

Hydration

Question 10

Portland cement is usually made of materials:

Answer 10

1. Limestone or marl
2. Shale or clay

Question 11

CLASSIFICATION OF CEMENT

Answer 11

1. Hydraulic Cement
2. Non-Hydraulic Cement

Question 12

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

Answer 12

Hydraulic Cement

Question 13

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

Answer 13

Non-hydraulic Cement

Question 14

TYPES OF CEMENT

Answer 14

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

Question 15

Type I - Ordinary Portland Cement is used for:

Answer 15

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

Question 16

Type II -Modified Portland Cement is used for:

Answer 16

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

Question 17

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

Answer 17

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

Question 18

Type IV - Blast Furnace Cement

Answer 18

is used for structures designed to resist chemical attack

Question 19

Type V - Portland Pozzolan Cement

Answer 19

is a low hardening characteristics concrete cement

Question 20

Type VI - High Alumina Cement is used for:

Answer 20

is used for high temperature, frost and acidic action

Question 21

Type VII - Quick Setting Cement

Answer 21

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

Question 22

Type VIII - Sulphate Resisting Cement is used for

Answer 22

construction in contact with soil or groundwater

Question 23

Type IX - White Cement is used for

Answer 23

for decorative work

Question 24

Type X - Colored Cement is used for

Answer 24

use for different decorative work

Question 25

Type XI - Air Entraining Cement is used for

Answer 25

where temperature is very low

Question 26

Type XII - Expansive Cement is used for

Answer 26

construction of the pre-stress concrete component

Question 27

Type XIII - Hydrophobic Cement is used for

Answer 27

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

Question 28

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

Answer 28

moisture-sentive material

Question 29

most types of portland cement are ship in bulk by

Answer 29

rail, truck, or barge

Question 30

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

Answer 30

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

Question 31

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

Answer 31

Vibro-grinding

Question 32

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

Answer 32

150 to 200mm

Question 33

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

Answer 33

300mm

Question 34

Aggregates properties:

Answer 34

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

Question 35

Sources of Aggregates

Answer 35

Natural Aggregate Crushed Aggregate

Question 36

Classification Of Aggregates

Answer 36

Coarse Aggregates Fine Aggregates

Question 37

Kinds of Additive

Answer 37

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