5.1 Classify the type of finish that can be obtained by using the following:
5.1.1 A Tyrolene machine
5.1.2 Hessian cloth or cement bag
5.2 State TWO purposes of screed - NSC Civil Technology Construction - Question 5 - 2020 - Paper 1
Question 5
5.1 Classify the type of finish that can be obtained by using the following:
5.1.1 A Tyrolene machine
5.1.2 Hessian cloth or cement bag
5.2 State TWO purposes of sc... show full transcript
Worked Solution & Example Answer:5.1 Classify the type of finish that can be obtained by using the following:
5.1.1 A Tyrolene machine
5.1.2 Hessian cloth or cement bag
5.2 State TWO purposes of screed - NSC Civil Technology Construction - Question 5 - 2020 - Paper 1
Step 1
5.1 Classify the type of finish that can be obtained by using the following:
5.1.1 A Tyrolene machine
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Answer
The Tyrolene machine is used to achieve a splatter finish, commonly referred to as a splatter dash finish or roughcast finish.
Step 2
5.1.2 Hessian cloth or cement bag
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Answer
Using hessian cloth or a cement bag results in a bagging finish, which provides a textured appearance to the surface.
Step 3
5.2 State TWO purposes of screed.
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Answer
To provide a smooth, level surface that can support various floor coverings.
To enhance the structural depth and strength of the base slab.
Step 4
5.3 Explain ONE method of preparing a smooth concrete floor to receive the screed.
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Answer
One effective method is to chip the surface with a sharp tool to remove the hard, surface skin and expose the fresh concrete underneath. Wetting the surface afterward can also improve adherence.
Step 5
5.4 Identify the material that can be added to plaster to increase its workability and plasticity.
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Answer
Builders' lime can be added to plaster to enhance its workability and plasticity.
Step 6
5.5 Differentiate between a rough arch and a gauged arch in terms of the respective shapes of the mortar joints.
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Answer
In a rough arch, the mortar joint will typically be wedge-shaped or triangular, while in a gauged arch, the mortar joint will be more uniform and rectangular in shape.
Step 7
5.6 Use ANSWER SHEET 5.6 and draw a neat sketch showing the alternate plan courses of a one-and-a-half brick pier built in stretcher bond.
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Answer
The sketch should demonstrate alternating courses in a stretcher bond pattern, focusing on ensuring that joints between bricks are staggered for added stability.
Step 8
5.7 Use ANSWER SHEET 5.7 and draw to scale 1:10 a horizontal section through a wooden door frame built into a 220 mm wall.
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Answer
The drawing must include details such as:
A brick wall measuring 220 mm
A door frame measuring 110 mm x 70 mm
A DPC attached to the door frame
Quarter rounds and labeled components.
Ensure to use appropriate scaling and labels for clarity.
