6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Construction - Question 6 - 2020 - Paper 1
Question 6
6.1 Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers in the A... show full transcript
Worked Solution & Example Answer:6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Construction - Question 6 - 2020 - Paper 1
Step 1
6.1.1 Steel that is used as reinforcement in concrete is available in the following thicknesses:
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Answer
The correct answer is A: 8 mm, 25 mm and 40 mm.
Step 2
6.1.2 Reinforcement rods and bars are available in lengths of up to …
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Answer
The correct answer is C: 12 000 mm.
Step 3
6.1.3 Bars are used to prevent the reinforcement from …
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Answer
The correct answer is D: All the above-mentioned.
Step 4
6.1.5 The purpose of minimum concrete cover is to ensure …
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Answer
The correct answer is D: All the above-mentioned.
Step 5
6.2 Give TWO reasons for the installation of pile foundations.
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Answer
Poor soil conditions, such as loose or unstable soil, necessitate the use of pile foundations to distribute loads more effectively.
Piles provide stability in areas where conventional foundations would not adequately support the structure.
Step 6
6.3 Draw a neat freehand sketch in your ANSWER BOOK showing the first step of the installation of a driven in-situ pile.
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Sketch should include a steel cable, steel pipe-casing, drop hammer, and labeling any one component clearly. Ensure correct proportion and placement in the drawing.
Step 7
6.4.1 Predict TWO consequences of installing the rib and block floor as shown.
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The block will not be supported and may collapse due to insufficient bonding between the rib and block.
The heavy nature of the block without holes will lead to further structural issues.
Step 8
6.4.2 Draw a neat freehand drawing in your ANSWER BOOK and rectify the faults in FIGURE 6.4.
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The drawing should show rectified rib and block configurations with clear indications of the necessary structural support and load distribution.
Step 9
6.4.3 What is the minimum recommended width of the load-bearing walls that support this type of floor construction?
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The minimum recommended width of the load-bearing walls is 220 mm.
Step 10
6.5 Use ANSWER SHEET 6.5 and draw a neat sectional view of a round reinforced concrete column with eight main bars in good proportion.
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The drawing should accurately depict a round column section showing eight main bars and proper spacing as per standard construction practices.
Step 11
6.6.1 The area of the floor
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Answer
To calculate, use the external measurements:
Area = Length × Width = 6,500 mm × 4,500 mm = 29,250,000 mm² = 29.25 m²
Step 12
6.6.2 The volume of concrete needed for the floor.
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Volume = Area × Thickness = 29.25 m² × 0.075 m = 2.19375 m³, rounded to 2.19 m³ for two decimal places.
Step 13
6.6.3 The number of tiles needed for the floor.
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Area of one tile = 350 mm × 350 mm = 0.1225 m². Total area/one tile area = 29.25 m² / 0.1225 m² = 239 tiles.
