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HKIA – Paper 5 – Building Material and Technology
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Question 1 of 30
1. Question
Hardcore shall comprise the following with no material exceeding 150 mm in size;
Correct
Hardcore shall comprise the following with no material exceeding 150 mm in size:
a. Rock filling material.
b. Broken stone, hard brick, concrete, or other comparable hard, inert, approved material. The material shall be free from dust, rubbish or deleterious foreign matter
(General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01).Incorrect
Hardcore shall comprise the following with no material exceeding 150 mm in size:
a. Rock filling material.
b. Broken stone, hard brick, concrete, or other comparable hard, inert, approved material. The material shall be free from dust, rubbish or deleterious foreign matter
(General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01). -
Question 2 of 30
2. Question
In calculating the allowable load capacity of the pile due to bond,
Correct
The maximum allowable compressive stress of the reinforcement shall not exceed 205 MPa for ribbed steel reinforcing bars in Grade 500. The maximum allowable bond stress between grout and reinforcement for ribbed steel reinforcing bars in Grade 500 shall not exceed 0.8 MPa. In calculating the allowable load capacity of the pile due to bond, the effective diameter of a group of bars (with spacing between adjacent bars less than 25mm) shall be equivalent to the diameter of a bar of equal total area (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
Incorrect
The maximum allowable compressive stress of the reinforcement shall not exceed 205 MPa for ribbed steel reinforcing bars in Grade 500. The maximum allowable bond stress between grout and reinforcement for ribbed steel reinforcing bars in Grade 500 shall not exceed 0.8 MPa. In calculating the allowable load capacity of the pile due to bond, the effective diameter of a group of bars (with spacing between adjacent bars less than 25mm) shall be equivalent to the diameter of a bar of equal total area (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
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Question 3 of 30
3. Question
For liquid retaining structures, Pulverized-fuel ash (PFA) or Ground Granulated Blastfurnace Slag (GGBS) shall be used and the Pulverized-fuel ash (PFA) content if used shall constitute 25% or above of the total cementitious content in the designed mix concrete. The mix shall also satisfy the following requirements:
Correct
For liquid retaining structures, Pulverized-fuel ash (PFA) or Ground Granulated Blastfurnace Slag (GGBS) shall be used and the Pulverized-fuel ash (PFA) content if used shall constitute 25% or above of the total cementitious content in the designed mix concrete. The mix shall also satisfy the following requirements:
i. Maximum Water/Cement ratio to be 0.45.
ii. Minimum cementitious content to be 325 kg/m3.
iii. Maximum cementitious content to be 450 kg/m3.
iv. Slump shall be greater than 75 mm (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Liquid Retaining Structures – 6.42.2).Incorrect
For liquid retaining structures, Pulverized-fuel ash (PFA) or Ground Granulated Blastfurnace Slag (GGBS) shall be used and the Pulverized-fuel ash (PFA) content if used shall constitute 25% or above of the total cementitious content in the designed mix concrete. The mix shall also satisfy the following requirements:
i. Maximum Water/Cement ratio to be 0.45.
ii. Minimum cementitious content to be 325 kg/m3.
iii. Maximum cementitious content to be 450 kg/m3.
iv. Slump shall be greater than 75 mm (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Liquid Retaining Structures – 6.42.2). -
Question 4 of 30
4. Question
The results of tests on concrete taken from Plant Trials shall comply with the following requirements except
Correct
The results of tests on concrete taken from Plant Trials shall comply with the following requirements:
i. The average of the nine measured slump values shall be within ±20 mm or ±25%, whichever is the greater, of the designed slump value. The average of the nine measured flow values shall be within ±50 mm of the designed flow value.
ii. The range of the three measured slump values for each batch of concrete shall not exceed 20% of the average of the three measured slump values for that batch. For flow table tests, the range of the three measured flow values for each batch of concrete shall be within 70mm.
iii. The average compressive strength at 28 days of the 18 test cubes shall exceed the Grade strength by at least 12 MPa for 100 mm test cubes or 10 MPa for 150 mm test cubes. The compressive strength of each individual test cube shall exceed the Grade strength by at least 5 MPa for 100 mm test cubes or 4 MPa for 150 mm test cubes.
iv. The range of the compressive strength of the six test cubes from each batch of concrete shall not exceed 20% of the average compressive strength of the six test cubes from that batch (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Compliance Criteria of Plant Trials – 6.43.2).Incorrect
The results of tests on concrete taken from Plant Trials shall comply with the following requirements:
i. The average of the nine measured slump values shall be within ±20 mm or ±25%, whichever is the greater, of the designed slump value. The average of the nine measured flow values shall be within ±50 mm of the designed flow value.
ii. The range of the three measured slump values for each batch of concrete shall not exceed 20% of the average of the three measured slump values for that batch. For flow table tests, the range of the three measured flow values for each batch of concrete shall be within 70mm.
iii. The average compressive strength at 28 days of the 18 test cubes shall exceed the Grade strength by at least 12 MPa for 100 mm test cubes or 10 MPa for 150 mm test cubes. The compressive strength of each individual test cube shall exceed the Grade strength by at least 5 MPa for 100 mm test cubes or 4 MPa for 150 mm test cubes.
iv. The range of the compressive strength of the six test cubes from each batch of concrete shall not exceed 20% of the average compressive strength of the six test cubes from that batch (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Compliance Criteria of Plant Trials – 6.43.2). -
Question 5 of 30
5. Question
In mastic asphalt roofing, Unless otherwise required, form skirtings not less than 150 mm high above roof finish with top edge splayed and tucked into a groove not less than
Correct
Unless otherwise required, form skirtings not less than 150 mm high above roof finish with top edge splayed and tucked into a groove not less than 25 mm deep (General for Building 2017 Edition – Section 12 – Roofing – Skirting – 12.66).
Incorrect
Unless otherwise required, form skirtings not less than 150 mm high above roof finish with top edge splayed and tucked into a groove not less than 25 mm deep (General for Building 2017 Edition – Section 12 – Roofing – Skirting – 12.66).
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Question 6 of 30
6. Question
For design purposes, the maximum bearing pressure of piles on bedrock shall not exceed the following;
Correct
For design purposes, the maximum bearing pressure of piles on bedrock shall not exceed the following:
a. 3 MPa for Grade III or better rock with total core recovery greater than 50% for any one metre within the rock mass.
b. 5 MPa for Grade III or better rock with total core recovery greater than 85% for any one metre within the rock mass and minimum uniaxial compressive strength (UCS) not less than 25 MPa (equivalent point load index strength PLI50 not less than 1 MPa).
c. 7.5 MPa for Grade II or better rock with total core recovery greater than 95% for any one metre within the rock mass and minimum uniaxial compressive strength (UCS) not less than 50 MPa (equivalent point load index strength PLI50 not less than 2 MPa) (General for Building 2017 Edition – Section 5 – Piling Work – Large Diameter Bored Piles – 5.19).Incorrect
For design purposes, the maximum bearing pressure of piles on bedrock shall not exceed the following:
a. 3 MPa for Grade III or better rock with total core recovery greater than 50% for any one metre within the rock mass.
b. 5 MPa for Grade III or better rock with total core recovery greater than 85% for any one metre within the rock mass and minimum uniaxial compressive strength (UCS) not less than 25 MPa (equivalent point load index strength PLI50 not less than 1 MPa).
c. 7.5 MPa for Grade II or better rock with total core recovery greater than 95% for any one metre within the rock mass and minimum uniaxial compressive strength (UCS) not less than 50 MPa (equivalent point load index strength PLI50 not less than 2 MPa) (General for Building 2017 Edition – Section 5 – Piling Work – Large Diameter Bored Piles – 5.19). -
Question 7 of 30
7. Question
Soil-cement shall consist of Portland Cement (PC), sand, and inorganic soil in the proportions
Correct
Soil-cement shall consist of Portland Cement (PC), sand, and inorganic soil in the proportions 1:3:12 by mass (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Soil-Cement – 3.27).
Incorrect
Soil-cement shall consist of Portland Cement (PC), sand, and inorganic soil in the proportions 1:3:12 by mass (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Soil-Cement – 3.27).
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Question 8 of 30
8. Question
Which of the following statement is true? If hydraulic hammer is used in the project, the following shall apply;
Correct
If hydraulic hammer is used in the project, the following shall apply;
The efficiency of drop of the hydraulic hammer used in the Hiley Formula shall be taken as 90% unless a higher value can be verified in accordance with Clause 5.14 (iv) (General for Building 2017 Edition – Section 5 – Piling Work – Design Submission – 5.02).Incorrect
If hydraulic hammer is used in the project, the following shall apply;
The efficiency of drop of the hydraulic hammer used in the Hiley Formula shall be taken as 90% unless a higher value can be verified in accordance with Clause 5.14 (iv) (General for Building 2017 Edition – Section 5 – Piling Work – Design Submission – 5.02). -
Question 9 of 30
9. Question
The centres of all driven piles and of all piles deriving their resistance mainly from friction shall be placed not less than
Correct
The centres of all driven piles and of all piles deriving their resistance mainly from friction shall be placed not less than half the length of the perimeter of the pile or 500 mm, whichever is the greater, from the site boundary (General for Building 2017 Edition – Section 5 – Piling Work – Minimum Spacing/Numbers of Piles – 5.08).
Incorrect
The centres of all driven piles and of all piles deriving their resistance mainly from friction shall be placed not less than half the length of the perimeter of the pile or 500 mm, whichever is the greater, from the site boundary (General for Building 2017 Edition – Section 5 – Piling Work – Minimum Spacing/Numbers of Piles – 5.08).
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Question 10 of 30
10. Question
In surface preparation for liquid membrane, All critical right-angle bends must have which of the following installed prior to application
Correct
All critical right-angle bends must have a cant strip or fillet installed prior to application (General for Building 2017 Edition – Section 11 – Tanking – Surface Preparation for Liquid Membrane – 11.08.02).
Incorrect
All critical right-angle bends must have a cant strip or fillet installed prior to application (General for Building 2017 Edition – Section 11 – Tanking – Surface Preparation for Liquid Membrane – 11.08.02).
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Question 11 of 30
11. Question
Which of the following statement is true about Tolerance for excavation? In case of cut slopes?
Correct
In case of cut slopes, the tolerance shall not exceed 75 mm measured at right angles to the batter (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Tolerance for Excavation – 3.11).
Incorrect
In case of cut slopes, the tolerance shall not exceed 75 mm measured at right angles to the batter (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Tolerance for Excavation – 3.11).
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Question 12 of 30
12. Question
Cement mortar for the following except
Correct
Cement mortar for the following:
i. Work below damp proof course, including basement walls.
ii. Chimney stacks above roof level.
iii. 70 and 105 mm brickwork.
iv. Concrete blockwork not exceeding 150 mm.
v. Load-bearing brick or block walls.
vi. Brickwork in engineering brick.
vii. Pointing where directed and where bedding is of cement mortar (General for Building 2017 Edition – Section 9 – Brickwork and Blockwork – Use of mortars – 9.25).Incorrect
Cement mortar for the following:
i. Work below damp proof course, including basement walls.
ii. Chimney stacks above roof level.
iii. 70 and 105 mm brickwork.
iv. Concrete blockwork not exceeding 150 mm.
v. Load-bearing brick or block walls.
vi. Brickwork in engineering brick.
vii. Pointing where directed and where bedding is of cement mortar (General for Building 2017 Edition – Section 9 – Brickwork and Blockwork – Use of mortars – 9.25). -
Question 13 of 30
13. Question
The prestressed element shall be deemed to have failed to comply with the strength requirement if any of the following conditions occur:
i. Visible cracks occur under the test load.
ii. Maximum deflection due to applied load exceeds l/500 of the effective span.
iii. After the 24 hour recovery period, the recovery of deflection is less than 85% of the maximum deflectionCorrect
The prestressed element shall be deemed to have failed to comply with the strength requirement if any of the following conditions occur:
a. Visible cracks occur under the test load.
b. Maximum deflection due to applied load exceeds l/500 of the effective span.
c. After the 24 hour recovery period, the recovery of deflection is less than 85% of the maximum deflection (General for Building 2017 Edition – Section 7 – Prestressed Concrete Work – Grout Vents – 7.63).Incorrect
The prestressed element shall be deemed to have failed to comply with the strength requirement if any of the following conditions occur:
a. Visible cracks occur under the test load.
b. Maximum deflection due to applied load exceeds l/500 of the effective span.
c. After the 24 hour recovery period, the recovery of deflection is less than 85% of the maximum deflection (General for Building 2017 Edition – Section 7 – Prestressed Concrete Work – Grout Vents – 7.63). -
Question 14 of 30
14. Question
Wash water from concrete mixer washing operations (recycled water) may be used for mixing concrete of grade strength not exceeding 35 MPa provided that:
Correct
Wash water from concrete mixer washing operations (recycled water) may be used for mixing concrete of grade strength not exceeding 35 MPa provided that :
i. The density of the combined water comprising tap water and recycled water does not exceed 1030 kg/m3.
ii. The 28 days strength of test cubes with combined water shall not fall below 90% of control test cubes made with tap water (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Water – 6.35).Incorrect
Wash water from concrete mixer washing operations (recycled water) may be used for mixing concrete of grade strength not exceeding 35 MPa provided that :
i. The density of the combined water comprising tap water and recycled water does not exceed 1030 kg/m3.
ii. The 28 days strength of test cubes with combined water shall not fall below 90% of control test cubes made with tap water (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Water – 6.35). -
Question 15 of 30
15. Question
Which of the following statement is true?
Correct
Accessories for steel sheets shall be made from 0.6 mm (minimum) thick galvanized steel sheet or to be approved proprietary fittings (General for Building 2017 Edition – Section 12 – Roofing – Accessories – 12.74).
Incorrect
Accessories for steel sheets shall be made from 0.6 mm (minimum) thick galvanized steel sheet or to be approved proprietary fittings (General for Building 2017 Edition – Section 12 – Roofing – Accessories – 12.74).
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Question 16 of 30
16. Question
Which of the following statement is true?
Correct
The maximum allowable compressive stress of the reinforcement shall not exceed 205 MPa for ribbed steel reinforcing bars in Grade 500. The maximum allowable bond stress between grout and reinforcement for ribbed steel reinforcing bars in Grade 500 shall not exceed 0.8 MPa. In calculating the allowable load capacity of the pile due to bond, the effective diameter of a group of bars (with spacing between adjacent bars less than 25mm) shall be equivalent to the diameter of a bar of equal total area (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
Incorrect
The maximum allowable compressive stress of the reinforcement shall not exceed 205 MPa for ribbed steel reinforcing bars in Grade 500. The maximum allowable bond stress between grout and reinforcement for ribbed steel reinforcing bars in Grade 500 shall not exceed 0.8 MPa. In calculating the allowable load capacity of the pile due to bond, the effective diameter of a group of bars (with spacing between adjacent bars less than 25mm) shall be equivalent to the diameter of a bar of equal total area (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
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Question 17 of 30
17. Question
In Bituminous emulsion roofing, Wash coat to consist of approved bitumen emulsion and water
Correct
Wash coat to consist of approved bitumen emulsion and water 1:1 by volume (General for Building 2017 Edition – Section 12 – Roofing – Wash Coat – 12.29).
Incorrect
Wash coat to consist of approved bitumen emulsion and water 1:1 by volume (General for Building 2017 Edition – Section 12 – Roofing – Wash Coat – 12.29).
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Question 18 of 30
18. Question
Excavating from ground level not exceeding 5000 mm in width at surface is referred to as
Correct
Trench excavation means excavating from ground level not exceeding 5000 mm in width at surface (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01).
Incorrect
Trench excavation means excavating from ground level not exceeding 5000 mm in width at surface (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01).
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Question 19 of 30
19. Question
Where the water level is higher than the bedrock level,
Correct
Where the water level is higher than the bedrock level, the concrete used shall have grade strength 25% higher than the design grade strength (General for Building 2017 Edition – Section 5 – Piling Work – Large Diameter Bored Piles – 5.19).
Incorrect
Where the water level is higher than the bedrock level, the concrete used shall have grade strength 25% higher than the design grade strength (General for Building 2017 Edition – Section 5 – Piling Work – Large Diameter Bored Piles – 5.19).
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Question 20 of 30
20. Question
In Bitumen felt built-up roofing, Provide skirtings as follows
Correct
Provide skirtings as follows:
a. To concrete roofs, provide a triangular cementitious internal angle fillet at bottom 75 mm wide on splay. Carry up underlayers of felt to form skirting 150 mm (minimum) high above roof level. Cover with an approved mineral felt flashing with one edge tucked into 25 mm groove in wall, wedged at 600 mm centres and pointed with mastic and seal to face of skirting with bonding compound.
b. To timber roofs, provide a 200 mm timber upstand with angle fillet at bottom fixed securely to roof deck and carry up roofing felt over it. Provide a lead apron flashing over. The lead flashing code and weight shall be confirmed by the SO (General for Building 2017 Edition – Section 12 – Roofing – Skirtings – 12.21).Incorrect
Provide skirtings as follows:
a. To concrete roofs, provide a triangular cementitious internal angle fillet at bottom 75 mm wide on splay. Carry up underlayers of felt to form skirting 150 mm (minimum) high above roof level. Cover with an approved mineral felt flashing with one edge tucked into 25 mm groove in wall, wedged at 600 mm centres and pointed with mastic and seal to face of skirting with bonding compound.
b. To timber roofs, provide a 200 mm timber upstand with angle fillet at bottom fixed securely to roof deck and carry up roofing felt over it. Provide a lead apron flashing over. The lead flashing code and weight shall be confirmed by the SO (General for Building 2017 Edition – Section 12 – Roofing – Skirtings – 12.21). -
Question 21 of 30
21. Question
Which of the following is true about formwork?
i. The design of formwork shall be such that no part of the formwork shall project into the finished surface of the concrete
ii. It consists primarily of sheathing material in direct contact with the concrete and joists or stringers supporting the sheathing.
iii. Designed to remain in position as part of the permanent workCorrect
– Formwork or forms is that section of the temporary works used to give the required shape, surface finish, and support to poured concrete. It consists primarily of sheathing material in direct contact with the concrete and joists or stringers supporting the sheathing.
– The design of formwork or falsework shall be such that no part of the formwork or falsework shall project into the finished surface of the concrete (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Generally – 6.01).
Incorrect
– Formwork or forms is that section of the temporary works used to give the required shape, surface finish, and support to poured concrete. It consists primarily of sheathing material in direct contact with the concrete and joists or stringers supporting the sheathing.
– The design of formwork or falsework shall be such that no part of the formwork or falsework shall project into the finished surface of the concrete (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Generally – 6.01).
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Question 22 of 30
22. Question
For Rock Socketed Steel H-piles, the allowable load capacity of individual pile shall not exceed
Correct
Rock Socketed Steel H-piles The allowable load capacity of individual pile shall not exceed 5500 kN (General for Building 2017 Edition – Section 5 – Piling Work – Rock Socketed Steel H-Piles – 5.22).
Incorrect
Rock Socketed Steel H-piles The allowable load capacity of individual pile shall not exceed 5500 kN (General for Building 2017 Edition – Section 5 – Piling Work – Rock Socketed Steel H-Piles – 5.22).
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Question 23 of 30
23. Question
Which of the following is true about Squared Uncoursed Rubble
i. Beds and joints to be rough punched so as to produce a joint not less than 10mm and greater than 20 mm in thickness
ii. At least one bonding rubble of minimum size 450 mm x 150 mm (minimum) shall be provided and carried through the full thickness of the wall per square meter
iii. The numbers of vertical joints shall be kept to a minimumCorrect
Roughly squared rubble of random sizes in square rubble walling shall be bonded together with continuous straight horizontal joints. The numbers of vertical joints shall be kept to a minimum (see Diagram B). Beds and joints to be rough punched so as to produce a joint not less than 10mm and greater than 20 mm in thickness (General for Building 2017 Edition – Section 10 – Masonry – Squared Uncoursed Rubble – 10.13).
Incorrect
Roughly squared rubble of random sizes in square rubble walling shall be bonded together with continuous straight horizontal joints. The numbers of vertical joints shall be kept to a minimum (see Diagram B). Beds and joints to be rough punched so as to produce a joint not less than 10mm and greater than 20 mm in thickness (General for Building 2017 Edition – Section 10 – Masonry – Squared Uncoursed Rubble – 10.13).
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Question 24 of 30
24. Question
Which of the following is not true about asbestos removal closely monitored by air sampling and an analysis of the air-borne fibres in conjunction with the removal work undertaken by an approved laboratory?
Personal air samples shall be taken for the worker carrying out asbestos removal work
i. A reading of less than 0.2 fibre/ml will be required in the penultimate clearance air sample analysis to ensure the site cleanliness after asbestos removal works
ii. For removal works of other types of asbestos materials, the reading shall not exceed 0.5 fibre/ml
iii. A reading of less than 0.01 fibre/ml shall be required for the removal works of amosite/crocidoliteCorrect
Personal air samples shall be taken for the worker carrying out asbestos removal work. A reading of less than 0.2 fibre/ml shall be required for the removal works of amosite/crocidolite. For removal works of other types of asbestos materials, the reading shall not exceed 0.5 fibre/ml.
A reading of less than 0.01fibre/ml will be required in the penultimate/final clearance/reassurance air sample analysis to ensure the site cleanliness after asbestos removal works (General for Building 2017 Edition – Section 2 – Demolition, Site Clearance and Alterations – Air Monitoring – 2.52).Incorrect
Personal air samples shall be taken for the worker carrying out asbestos removal work. A reading of less than 0.2 fibre/ml shall be required for the removal works of amosite/crocidolite. For removal works of other types of asbestos materials, the reading shall not exceed 0.5 fibre/ml.
A reading of less than 0.01fibre/ml will be required in the penultimate/final clearance/reassurance air sample analysis to ensure the site cleanliness after asbestos removal works (General for Building 2017 Edition – Section 2 – Demolition, Site Clearance and Alterations – Air Monitoring – 2.52). -
Question 25 of 30
25. Question
Free expansion of grout when measured at the end of 24 hours after mixing shall have a figure between
Correct
Free expansion of grout when measured at the end of 24 hours after mixing shall have a figure between 0% and 5% (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
Incorrect
Free expansion of grout when measured at the end of 24 hours after mixing shall have a figure between 0% and 5% (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
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Question 26 of 30
26. Question
The allowable load capacity of piles in the load case with wind load may be increased to
Correct
The allowable load capacity of piles in the load case with wind load may be increased to 1.25 times the appropriate values as given in Clause 5.0 (General for Building 2017 Edition – Section 5 – Piling Work – General – 5.01).
Incorrect
The allowable load capacity of piles in the load case with wind load may be increased to 1.25 times the appropriate values as given in Clause 5.0 (General for Building 2017 Edition – Section 5 – Piling Work – General – 5.01).
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Question 27 of 30
27. Question
Unless otherwise specified filling material shall be compacted to obtain the following relative compaction (RC) except:
Correct
Unless otherwise specified filling material shall be compacted to obtain the following relative compaction (RC):
a. Fill within the 1.5 metres thick top surface zone of the platforms and fill within the 2.5 metres thick top surface zone of the peripheral slopes measured at right angles to the batter – Relative Compaction(RC) of at least 95%.
b. Interior of large fill platforms which do not or will not support structures – Relative Compaction(RC) of at least 90%.
c. Interior of large fill platforms supporting structures – Relative Compaction(RC) of at least 95%.
d. Fill immediately below road formation level – Relative Compaction(RC) of at least 98% for a depth of 200 mm.
e. Backfill to foundation pits or underneath suspended ground slab – Relative Compaction(RC) of at least 90% or as agreed by the SO (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Compaction by Performance Specification – 3.19).Incorrect
Unless otherwise specified filling material shall be compacted to obtain the following relative compaction (RC):
a. Fill within the 1.5 metres thick top surface zone of the platforms and fill within the 2.5 metres thick top surface zone of the peripheral slopes measured at right angles to the batter – Relative Compaction(RC) of at least 95%.
b. Interior of large fill platforms which do not or will not support structures – Relative Compaction(RC) of at least 90%.
c. Interior of large fill platforms supporting structures – Relative Compaction(RC) of at least 95%.
d. Fill immediately below road formation level – Relative Compaction(RC) of at least 98% for a depth of 200 mm.
e. Backfill to foundation pits or underneath suspended ground slab – Relative Compaction(RC) of at least 90% or as agreed by the SO (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Compaction by Performance Specification – 3.19). -
Question 28 of 30
28. Question
The point load index strength of rock is the equivalent value for
Correct
The point load index strength of rock is the equivalent value for 50 mm diameter cores (General for Building 2017 Edition – Section 5 – Piling Work – Large Diameter Bored Piles – 5.19).
Incorrect
The point load index strength of rock is the equivalent value for 50 mm diameter cores (General for Building 2017 Edition – Section 5 – Piling Work – Large Diameter Bored Piles – 5.19).
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Question 29 of 30
29. Question
Design bond strength between bedrock and grout shall not exceed 0.64 MPa for grout having minimum cube strength of
Correct
Design bond strength between bedrock and grout shall not exceed 0.7 MPa for grout having minimum cube strength of 30 MPa at 28 days and 0.64 MPa for grout having minimum cube strength of 25 MPa at 28 days (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
Incorrect
Design bond strength between bedrock and grout shall not exceed 0.7 MPa for grout having minimum cube strength of 30 MPa at 28 days and 0.64 MPa for grout having minimum cube strength of 25 MPa at 28 days (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).
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Question 30 of 30
30. Question
In steel sheet roofing and cladding, Vertical sheets shall be fixed with minimum laps of
Correct
Lay sloping sheets with minimum end laps of 150 mm. Vertical sheets shall be fixed with minimum laps of 75 mm. All laps shall be located over a supporting member (General for Building 2017 Edition – Section 12 – Roofing – Laps – 12.78).
Incorrect
Lay sloping sheets with minimum end laps of 150 mm. Vertical sheets shall be fixed with minimum laps of 75 mm. All laps shall be located over a supporting member (General for Building 2017 Edition – Section 12 – Roofing – Laps – 12.78).