4.1 Choose a description from COLUMN B that matches an item in COLUMN A - NSC Civil Technology Construction - Question 4 - 2022 - Paper 1
Question 4
4.1 Choose a description from COLUMN B that matches an item in COLUMN A. Write only the letter next to the question numbers (4.1.1 to 4.1.8) in the ANSWER BOOK, e.g.... show full transcript
Worked Solution & Example Answer:4.1 Choose a description from COLUMN B that matches an item in COLUMN A - NSC Civil Technology Construction - Question 4 - 2022 - Paper 1
Step 1
4.1.1 Advantage of ready-mixed concrete
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Ready-mixed concrete offers the advantage of consistent quality and precise mixing, as it is manufactured in a controlled environment.
Step 2
4.1.2 Disadvantage of ready-mixed concrete
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A significant disadvantage is the reliance on timely delivery; any delay can affect the workability and quality of the concrete.
Step 3
4.1.3 Boom pump
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A boom pump uses flexible or steel hoses to place concrete efficiently in hard-to-reach areas.
Step 4
4.1.4 Slump test
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The slump test is used to determine the workability and water content of fresh concrete.
Step 5
4.1.5 Collapsed slump
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Collapsed slump indicates that too much water was added to the concrete mixture, compromising its strength.
Step 6
4.1.6 Cube test
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The cube test is used to determine the compressive strength of concrete, typically after 28 days of curing.
Step 7
4.1.7 Tier pin concrete
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Tier pin concrete is used to manufacture structural components that require high strength and durability.
Step 8
4.1.8 High-strength concrete
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High-strength concrete is characterized by a compressive strength of 30 MPa after 28 days.
Step 9
4.2 State the minimum distance that excavated soil should be kept away from the edge of a trench.
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The minimum distance that excavated soil should be kept from the edge of a trench is 600 mm.
Step 10
4.3 Explain THREE safety factors that should be considered before excavation begins.
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Ground Stability: Assessing the stability of the ground is crucial to prevent collapses.
Safety Plan: Developing a safety plan and taking necessary precautions helps ensure safe working conditions.
Protective Systems: Excavation work should be supported by a protective system to safeguard workers.
Step 11
4.4 Describe TWO properties of steel shuttering.
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Strength: Steel shuttering is strong enough to bear the mass of wet concrete without collapsing.
Reusability: Steel shuttering is reusable, making it cost-effective over time.
Step 12
4.5 Describe THREE methods that can be used to level a site.
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Filling a Slope: Adding material to fill low areas assists in leveling the site.
Cutting Away a Slope: Removing excess material from high areas also helps in achieving the desired level.
Using Excavated Soil: The soil excavated from a site can be used to fill lower areas and level the ground.
Step 13
4.6 Name THREE components of shuttering that is used to support trenches.
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Folding wedges
Walling boards
Poling boards
Step 14
4.7 Name ONE property of block board used in formwork.
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Block board is lightweight, making it easy to handle and work with.
Step 15
4.8 Identify the machine shown in FIGURE 4.8.
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The machine shown in FIGURE 4.8 is a tamping rammer, used for compacting soil.
Step 16
4.8.2 Explain safe handling with regard to hands and feet when operating the machine.
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When operating the machine, ensure to use both hands to control it firmly, keep feet at a safe distance from moving parts, and wear appropriate personal protective equipment like gloves.
Step 17
4.8.3 Motivate why it is important to clean the parts of the machine after it has been used.
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Cleaning the parts of the machine is vital to prevent rust and ensure it functions effectively for a longer duration.
