6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Construction - Question 6 - 2022 - 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 (6.1.1 t... 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 - 2022 - Paper 1
Step 1
6.1.1 Which ONE of the following is a force that can act on a structure?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The answer is D: All the above-mentioned forces—shear force, compression force, and tensile force—can act on a structure.
Step 2
6.1.2 Reinforcement on a construction drawing is indicated using a code. In the code 9R 16 01 150, the 150 indicates the ...
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The answer is A: centre-to-centre spacing of the bars.
Step 3
6.1.3 What does a steel-tube caisson pile use?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The answer is B: Casing driven into the ground.
Step 4
6.1.4 The drying curing time for the formation of a suspended concrete floor is ... days.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The answer is B: 28 days.
Step 5
6.1.5 The bars for a 100 mm thick reinforced concrete floor slab should be ...
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The answer is A: 10 mm bars with 112 mm spacing.
Step 6
6.2 In the correct sequence, explain in FOUR steps how driven in-situ piles can be installed.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Metal pipes that contain a dry concrete mix (gravel plug) are driven into a drilled hole in the ground.
A drop hammer is used to drive the pre-filled dry concrete mix (gravel plug) out of the pipe to form an extended base (toe) at the bottom of the hole.
Concrete is now poured into the pipe and compacted with a drop hammer.
The steel pipe is slowly extracted as the concrete is poured into the pipe.
Step 7
6.3.1 Identify parts A and C.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Part A is identified as a hollow-core concrete block, while part C is a reinforced rib or pre-stressed concrete rib.
Step 8
6.3.2 Describe the purpose of the hole at B.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The purpose of hole B is to facilitate the placement of conduit pipes.
Step 9
6.3.3 Describe TWO disadvantages of this type of floor construction.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Mechanical handling is required on-site, which can introduce complications.
Manual labour is required to place blocks, increasing labor costs.
Step 10
6.3.4 State THREE components, other than parts A and C, which are used for this type of floor construction.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Steel mesh or reinforcement.
Spacers for maintaining gaps between components.
Props or poles to support the framework.
Step 11
6.4.1 Identify parts A and B.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Part A is an anchor bar, while part B is the main bar used for reinforcement.
Step 12
6.4.2 Use ANSWER SHEET 6.4 and draw the reinforcing of the part encircled. Show and label the minimum concrete cover depth.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Draw and label the stirrups and main reinforcing bars within the beam. Indicate the minimum concrete cover depth of at least 40 mm.
Step 13
6.5 Describe TWO reasons why minimum concrete cover depth is important for concrete reinforcement.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To protect the steel against corrosion, ensuring durability.
To ensure adequate bonding between the steel and the concrete, which contributes to structural integrity.
Step 14
6.6 Reinforcing that is exposed to severe conditions must be protected by a minimum concrete cover of 40 mm. State TWO elements against which this reinforcing must be protected.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Corrosive fumes that can deteriorate the reinforcement.
Water that is moderately aggressive can compromise the reinforcing steel.
Step 15
6.7.1 Total length of the skirting for the store room (ignore the reveals)
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The external dimensions of the store room are 8,500 mm by 4,000 mm. The skirting length is the perimeter, which is calculated as:
Length = 2(8,500 + 4,000) - 900 = 22,340 mm.
Step 16
6.7.2 Volume of the screed if the screed is 25 mm thick.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The screed volume can be calculated using the formula:
Volume = Length x Width x Thickness = 8,500 mm x 4,000 mm x 25 mm = 8500 x 4000 x 0.025 m = 850 m³.
