5.1 Classify the type of finish that can be obtained by using the following:
5.1.1 A Tyrolene machine
5.1.2 Hession 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 Hession cloth or cement bag
5.2 State TWO purposes of ... 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 Hession cloth or cement bag
5.2 State TWO purposes of screed - NSC Civil Technology Construction - Question 5 - 2020 - Paper 1
Step 1
5.1.1 A Tyrolene machine
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Answer
The Tyrolene machine is used to achieve a splatter finish, also known as a splatter dash finish or roughcast finish. This technique involves spraying a mixture of cement and water onto the surface to create a textured appearance.
Step 2
5.1.2 Hession cloth or cement bag
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Using Hession cloth or a cement bag allows for a bagging finish. This technique involves applying a thin layer of mortar or cement via a cloth or bag to enhance the surface finish and protect the underlying material.
Step 3
5.2 State TWO purposes of screed.
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To provide a smooth, level, and neat surface for subsequent flooring finishes.
To enhance the structural depth and strength of the base slab, preparing it for floor covering materials.
Step 4
5.3 Explain ONE method of preparing a smooth concrete floor to receive the screed.
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One effective method is to chip the surface with a sharp tool to remove any surface skin, exposing the hard, clean concrete underneath. Additionally, wetting the surface can help achieve a better bond between the concrete and the screed.
Step 5
5.4 Identify the material that can be added to plaster to increase its workability and plasticity.
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Builders' lime is a material that can be added to plaster to enhance its workability and plasticity, making it easier to apply and manipulate.
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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A rough arch features wedge-shaped or triangular mortar joints, resulting in a more rugged appearance. In contrast, a gauged arch has uniform or rectangular mortar joints, offering a more refined and structured look.
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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On the sketch, ensure that the brick courses are laid in a stretcher bond pattern. The first course should be laid with alternating headers and stretchers, while the second course aligns with the middle of the bricks from the first course to ensure the structural integrity of the pier.
Step 8
5.7 Use ANSWER SHEET 5.7 and draw to scale 1 : 10 a horizontal section view through a wooden door frame built into a 220 mm wall.
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When drawing, ensure to accurately represent the dimensions of the wall (220 mm) and the door frame (110 mm x 70 mm). Include necessary features such as the plaster finish, exterior reveal, and the DPC (damp-proof course) attached to the door frame for proper detailing.
