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Mastering Concrete: Specification, Inspection & Restoration of Reinforced Concrete Structures Training
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Specification, Inspection & Restoration of Reinforced Concrete Structures – Assessment & Evaluation
Specification, Inspection & Restoration of Reinforced Concrete Structures - Assessment & Evaluation
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Please tick the correct answer for each of the below questions or statements:
1. What component of reinforced concrete is responsible for most of its deterioration?
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Stone
Steel
Water
2. Is it correct that a drop in the water/cement ratio will lower concrete strength
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Correct
Not Correct
3. Slag is obtained from the extraction of iron from its ore. It will speed up the hydration of cement.
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True
False
4. To speed up the hydration reaction of cement it is necessary to grind it finer
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Yes
No
5. Is it true that a cement classified CEM IIA S 32.5 will contain between 6% and 20% fly ash and will react very slowly?
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True
False
6. A slump test measures the degree to which a cone of concrete collapses to measure how much friction in the concrete has been overcome.
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Correct
Not Correct
7. Concrete is said to bleed if water is forced to the surface by the settlement of solid particles
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True
False
8. What is the maximum temperature at which concrete should be placed in a mould?
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35°
42°
9. If hot concrete is not properly compacted, what will the immediate consequence be?
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Strength loss
Shorter lifespan
10. A large coarse aggregate will reduce the costs of the concrete and reduce the potential shrinkage of the concrete mix
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True
False
11. The best sand for concrete is a clean, river sand where all the particles are approximately the same size
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True
False
12. The hydration reaction of cement will form a crystalline material on the cement particle surface and the denser these crystals mesh the stronger the concrete will bel
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Yes
True
13. The use of extenders from other industries is common but will slow down the reaction of cement and improve the resistance to the ingress of chlorides and carbon dioxide.
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Will happen
Will not happen
14. A cement that has a code ending in 32.5 would work very quickly
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Yes it would
No it would not
15. When could an accelerating admixture be properly used
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In very cold weather
In very hot weather
16. What effect will a sulphate contamination in mixing water have on concrete?
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Make it swell
Make it shrink
17. What is the most important concrete strength measured in the laboratory?
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The specified or cube strength
The core strength as that is taken from the structure
18. What proportion of the concrete strength measured by cubes is used by the structural designer when designing a structure
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45%
85%
19. Concrete with a low E value will deflect excessively when loaded in a flexural member
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True
False
20. Will hardened concrete in a floor slab crack when restrained from shrinkage movement by a column supporting the roof if it is not isolated.
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Yes
No
21. Will concrete lose workability during transport due to loss of water and early hydration in hot weather?
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Yes
No
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