Concrete Works

Question 1

operations carried out in the erection of monologic concrete reinforced concrete structure and installations made of cement complete

Answer 1

Concrete Works

Question 2

concrete works include the following basic processes:

Answer 2

1. Preparation
2. Delivery
3. Moulding
4. Curing
5. Quality Control

Question 3

concrete has three different states:

Answer 3

1. Plastic State
2. Stiffening State
3. Hardening State

Question 4

a state where concrete is mixed place molded into different shapes and compacted

Answer 4

Plastic State

Question 5

a state where concrete when it is no longer soft in plastic state

Answer 5

Stiffening State

Question 6

a state where after concrete has it begins to gain strength and hardening

Answer 6

Hardening State

Question 7

important properties of plastic state

Answer 7

workability and cohesiveness

Question 8

setting takes place after

Answer 8

compaction and during finishing

Question 9

important properties of hardening state

Answer 9

strength and durability

Question 10

equipment used to provide concrete for construction purposes ranges from

Answer 10

1. concrete mixer
2. transit mixer mobile
3. concrete mixer plant
4. concrete batch plant

Question 11

some ways to transport concrete including

Answer 11

1. concrete truck
2. concrete pump
3. crane and bucket
4. chute
5. conveyor
6. hoist
7. wheelbarrow

Question 12

Way of Placing concrete

Answer 12

when placing concrete be careful not to damage or move the formwork and reinforcement

Question 13

important safety information

Answer 13

where suitable protective clothing to avoid skin contact

Question 14

three things to avoid when transporting and placing concrete

Answer 14

1. delay
2. segregate
3. wastage

Question 15

can cause the concrete to dry out and stiffen

Answer 15

Delay

Question 16

when the coarse and fine aggregate and cement phase become separated

Answer 16

Segregation

Question 17

segregation makes the concrete

Answer 17

1. weaker
2. less durable
3. poor surface finish

Question 18

can be costly especially on small jobs

Answer 18

Wastage

Question 19

is done by shaking or vibrating the concrete which liquefies it allowing the trapped air to rise out

Answer 19

compaction

Question 20

when to compact

Answer 20

must be done as concrete is placed while it is still plastic

Question 21

why we compact concrete

Answer 21

to make concrete more strong and durable

Question 22

two types of external vibration

Answer 22

1. manual screed
2. the mechanical screed

Question 23

a spreading that use thick slabs

Answer 23

external vibration

Question 24

is done with mechanical vibrator or poker vibrator

Answer 24

internal vibration