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, as these are standard thicknesses for reinforcement steel.
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, which is a common maximum length for reinforcement rods.
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. Bars are instrumental in preventing bending, buckling, and other deformities in reinforcement.
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. Minimum concrete cover ensures adequate bonding, protection from fire, and prevents corrosion.
Step 5
6.2 Give TWO reasons for the installation of pile foundations.
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Poor soil conditions: Pile foundations provide stability in areas where soil is too soft or unstable for ordinary foundations.
Load distribution: Piles distribute the load of structures more evenly, particularly in loose soil or when building on weak ground.
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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The sketch should include:
A steel cable for pulling the pile;
A steel pipe casing around the pile;
A drop hammer for driving the pile into the ground;
Any appropriate label for clarity.
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, causing structural failure.
Installation may be unsuccessful due to inadequate support, leading to safety hazards.
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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Ensure that the blocks are properly aligned, with adequate support and reinforcement visible in the drawing.
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, as per standard construction practices.
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 clearly depict a round column with eight evenly spaced main bars and additional stirrups, along with correct dimensions for clarity.
Step 11
6.6.1 The area of the floor
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Answer
To calculate the area of the floor, we find the internal measurements:
The area = length × width = 4 060 mm × 6 060 mm = 24.6 m².
Step 12
6.6.2 The volume of concrete needed for the floor.
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The volume of concrete = area × thickness = 24.6 m² × 0.075 m = 1.845 m³. Rounding off gives approximately 1.85 m³.
Step 13
6.6.3 The number of tiles needed for the floor.
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The area of one tile is 0.1225 m² (350 mm × 350 mm). The total number of tiles needed = floor area / tile area = 24.6 m² / 0.1225 m² ≈ 200 tiles.
