Formative MCQ weekly assessments

Question 1

Answer 1

A - Fly Ash

Question 2

Answer 2

C - 1400

Question 3

Answer 3

C - Reacts with water

Question 4

Answer 4

B - Steel

Question 5

Answer 5

D - A coarse aggregate particle

Question 6

Answer 6

C - 1.6 tonnes

Question 7

Answer 7

B - The coefficient of thermal expansion of steel is about the same as concrete

Question 8

Answer 8

C - It is required for infrastructure development

Question 9

Answer 9

A - To address concerns over chrome 6 content

Question 10

Answer 10

A - Coarse aggregate, fine aggregate, cement, water

Question 11

Answer 11

A - It’s not a very specific test - it’s really for quality control - but probably yield stress rather than plastic viscosity

Question 12

Answer 12

A - Fluidity, Compatibility, and Cohesion

Question 13

Answer 13

A - This fraction gives the mix cohesion i.e prevents segregation of the aggregate, cement and water

Question 14

Answer 14

A - g = yield stress h = plastic viscosity

Question 15

Answer 15

A - Fine and coarse aggregate sizes; aggregate grading (%<600 microns); crushed vs uncrushed aggregate; cement type

Question 16

Answer 16

A - Ettringite

Question 17

Answer 17

A - The period of slow hydration

Question 18

Answer 18

A - 1.7

Question 19

Answer 19

A - Ettringite - portlandite - C-S-H

Question 20

Answer 20

A - C3A

Question 21

Answer 21

A - Long thin needles

Question 22

Answer 22

D - Within the volume of the original cement particles

Question 23

Answer 23

A - 28 days

Question 24

Answer 24

A - Yes choosing the wrong the wrong aggregate can cause an alkali aggregate reaction which weakens the concrete

Question 25

Answer 25

A - Docklands light railway

Question 26

Answer 26

C - It increases by 10-15%

Question 27

Answer 27

A - They can produce stronger concrete

Question 28

Answer 28

A - They allow rapid overbuilding on large buildings

Question 29

Answer 29

A - GGBS (Ground granulated blast furnace slag)

Question 30

Answer 30

A - They accelerate hydration, enabling more rapid construction

Question 31

Answer 31

A - C3A (Alite)

Question 32

Answer 32

A - To obtain good chloride resistance

Question 33

Answer 33

A - Particles are spherical

Question 34

Answer 34

A - Oven dried aggregate will be stronger and less workable

Question 35

Answer 35

A - The fine aggregate fills the gaps between the coarse aggregate particles, reducing voids ratio and thus the amount of cement paste required for compaction

Question 36

Answer 36

A - Reduced carbon footprint

Question 37

Answer 37

A - All the reasons

Question 38

Answer 38

A - Fly ash

Question 39

Answer 39

A - Quartz undergoes an expansive phase change at 573°C causing the concrete to become unstable.

Question 40

Answer 40

A - Affects the density of concrete, and hence it's self weight and deflections

Question 41

Answer 41

A - Metakaolin

Question 42

Answer 42

A - How much aggregate will absorb moisture and will also affect porosity

Question 43

Answer 43

A

Question 44

Answer 44

A

Question 45

Answer 45

D

Question 46

Answer 46

A

Question 47

Answer 47

A

Question 48

Answer 48

A

Question 49

Answer 49

A

Question 50

Answer 50

A

Question 51

Answer 51

A

Question 52

Answer 52

A

Question 53

Answer 53

A

Question 54

Answer 54

A

Question 55

Answer 55

A

Question 56

Answer 56

A

Question 57

Answer 57

A

Question 58

Answer 58

A

Question 59

Answer 59

A

Question 60

Answer 60

A

Question 61

Answer 61

A

Question 62

Answer 62

A

Question 63

Answer 63

A

Question 64

Answer 64

A

Question 65

Answer 65

A

Question 66

Answer 66

A

Question 67

Answer 67

A

Question 68

Answer 68

A

Question 69

Answer 69

A