Concrete

Question 1

Concrete is a mixture of…

Answer 1

Cement
Aggregate
Water

Question 2

The 4 Types of Cement?

Answer 2

Portland Cement
Natural Cement
Low carbon
High alumina

Question 3

Manufacture of Portland Cement is a mixture of..

Answer 3

Limestone/Chaulk (calcareous materials)

And

Clay/Shale (Silica and Alumina)

Question 4

Cement Manufacture 2 basic processes?

Answer 4

Wet Process - slurry

Dry Process - Raw meal

Question 5

4 Chemicals of Portland Cement

Answer 5

Tricalcium Silicate
Dicalcium Silicate
Tricalcium Aluminate
Tetracalcium Aluminate

Question 6

5 types of Portland Cement

Answer 6

CEM 1 Portland
CEM 2 Portland Cement Composite
CEM 2 Portland Cement Blast Furnace
CEM 3 Pozzolanic Cement
CEM 4 Composite Cement

Question 7

3 Cement Replacements

Answer 7

Fully Hydraulic
Latent Hydraulic
Filler

Question 8

Name of Low Carbon Cements

Answer 8

Alkali Activated Cement
Magnesium Oxide (Eco Cement)

Question 9

Aggregate Types

Answer 9

Crushed Aggregates

Sand and Gravel

Question 10

Crushed Aggregate Rock Types

Answer 10

Igneaus
Sedimentary
Metamorphic

Question 11

What does consistence mean to describe Concrete?

Answer 11

Overall term used to describe the characteristics of Concrete

Question 12

What does mobility mean?

Answer 12

The flow of concrete

Question 13

What does compatibility mean?

Answer 13

How easy to remove air

More mobile the Concrete, easier to remove air

Question 14

Of 1% voids In Concrete, how much strength is lost ? (%)

Answer 14

5-10%

Question 15

What does bleeding mean?

Answer 15

Whereby water sits like a clear layer on the surface of the setting Concrete
Bleeding weakens the surface of the finished concrete

Question 16

What are the compaction layers and strokes of the Slump Test?

Answer 16

3 layers, 25 strokes of tampering rod

Question 17

What are the compaction layers and strokes of the Flow Table Test ?

Answer 17

2 layers, 15 strokes

Question 18

What are the 5 types of Admixtures and their purpose?

Answer 18

Accelerators - speed up curing
Plasticisers - workability, less water required
Retarders - Workable Concrete for longer (sugar)
Air Retainers - protect from frost

Question 19

5 Properties of Hardened Concrete

Answer 19

Strength
Shrinkage 
Deformation under load
Permeation
Durability

Question 20

What are the factors affecting Strength of Concrete?

Answer 20

Combination in mix
Preparation and laying
Curing

Question 21

What does Curing mean?

Answer 21

Water & Mix reacting and hardening

Question 22

How long does it take for Concrete to fully harden ?

Answer 22

28 days

Question 23

What are the 4 types Shrinkage ?

Answer 23

Plastic shrinkage
Drying shrinkage
Autogenous Shrinkage
Carbonation shrinkage