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Home » PRE COURSE QUIZ – CONCRETE MATERIAL & PLACEMENT

Concrete Material & Placement – Concrete Structure Series (1/6)

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INTRODUCTION TO CONCRETE MATERIAL

PRE COURSE QUIZ – Concrete Material & Placement

1 Quiz
- PRE COURSE QUIZ – CONCRETE MATERIAL & PLACEMENT
What is Concrete Material and Its Components? (12:39)
Concrete Mix Design Example & Checks (12:19)
Concrete Green Star Rating (06:28)
CONCRETE WORKABILITY

Concrete Workability (09:16)
Concrete Slump Test (18:49)

5 Topics
Concrete Temperature Check
When Do We Reject the Concrete? (02:49)
Concrete Vibration (12:16)
CONCRETE FINISHES

Concrete Finish Classification (04:07)
Unformed Concrete Surface Finish Methods (05:05)
CONCRETE CURING & STRENGTH GAIN

Concrete Curing Methods and Checklist (11:03)
Concrete Strength Gain (09:36)

Quizzes

Concrete Material & Placement _ Course Quiz

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Adam Drabik
Alejandra Toda Luna
Alessandro Serratore
Alex Ceki

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PRE COURSE QUIZ – CONCRETE MATERIAL & PLACEMENT

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Concrete Material & Placement – Concrete Structure Series (1/6) PRE COURSE QUIZ – Concrete Material & Placement PRE COURSE QUIZ – CONCRETE MATERIAL & PLACEMENT

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Question 1 of 10

1. Question
How does too much fly ash in the concrete mix design adversely affect the construction program?
- Too much fly ash results in low early strength and delays stressing and stripping.
- Too much fly ash results in high early strength and removes the need for stressing.
- Too much fly ash results in low slump, which delays pumping & placement of the concrete.
- Too much fly ash means extra water is required in the mix to reach the desired concrete strength.
Question 2 of 10

2. Question
Why should concrete be rejected if the temperature of the mix is greater than 35 degree Celsius?
- Because this concrete mix is already setting, and there’s not enough time to pump & place it.
- Because the concrete mix does not have enough water to activate the hydration process.
- Because there’s a high risk of structural cracking after it has been placed.
- Because it will take more than 28 days to reach the design strength.
Question 3 of 10

3. Question
Why is superplasticizer additive used inside a concrete mix?
- to increase concrete strength
- to increase concrete slump
- to decrease the concrete temperature before placing
- All of the above
Question 4 of 10

4. Question
Is it allowed to add water on site to increase slump?
- Yes, if the mix is dried up and the truck is stuck in traffic
- Yes, it is a common practice and good to do
- No, unless given in mixed design with its specific requirements
- No, unless it is a hot day and we donot get the design slump
Question 5 of 10

5. Question
Why is a concrete slump test required before pumping?
- To check water per cement ratio in the concrete mix.
- To check mix consistency and see if the concrete can easily be pumped and worked on site
- To measure if the concrete is going to have the right strength
- To check if the concrete design mix has enough small aggregates
Question 6 of 10

6. Question
Select the most appropriate action where a concrete mix with 80 mm design slump, is tested on-site for the second time and returns a 60 mm slump.
- Just pump and place the concrete quickly before it sets
- Add some water to the mix before pumping the concrete.
- Reject the concrete mix.
- Discuss issue with concrete supplier to confirm best action.
Question 7 of 10

7. Question
Why should vibration poker be inserted into concrete being poured, roughly every 300 mm?
- To avoid clashing with reinforcement as typical bar spacing is around 300 mm
- It is related to poker size and its effective diameter
- It is related to using a concrete with slump of 80 – 100 mm
- It is easier to handle the poker on site by one person
Question 8 of 10

8. Question
What is the total number of concrete finishing classes available for a FORMED surface, and which class is the highest?
- 5 classes, class 1 is the highest
- 5 classes, class 5 is the highest
- 3 classes, class A is the highest
- 3 classes, class C is the highest
Question 9 of 10

9. Question
What is the PRIMARY reason to ensure concrete is cured?
- To avoid defects like honeycombing
- To ensure concrete has adequate amount of moisture for continued hydration and development of strength.
- Because otherwise concrete would develop structural cracks
- All of the above
Question 10 of 10

10. Question
Which statement below is valid for concrete strength gain?
- Superplasticiser helps concrete to gain strength faster
- Fly ash helps concrete to gain strength faster
- Concrete used for PT(post tensioning) application gains strength in faster rate compared to the concrete used for RC (reinforced concrete) application
- It takes 56 days for concrete to reach its design strength

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