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HKIA – Paper 5 – Building Material and Technology
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Question 1 of 30
1. Question
Remedial measures for common defects in concrete causing water leakage and even structural failure in worse situations include the following except
Correct
Remedial measures which include cement grouting, epoxy grouting, or guniting should be recommended and supervised by the Registered Structural Engineer (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Common defects).
Incorrect
Remedial measures which include cement grouting, epoxy grouting, or guniting should be recommended and supervised by the Registered Structural Engineer (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Common defects).
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Question 2 of 30
2. Question
Raft foundation is
Correct
Raft foundation is a continuous slab of spread footings used on poor soils to acquire a big base to spread out the loading of the superstructure (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.4 – An Outline of Foundation System in Hong Kong – Shallow Foundation).
Incorrect
Raft foundation is a continuous slab of spread footings used on poor soils to acquire a big base to spread out the loading of the superstructure (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.4 – An Outline of Foundation System in Hong Kong – Shallow Foundation).
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Question 3 of 30
3. Question
Which of the following statement is true?
Correct
The average drying shrinkage of a sample must not exceed 0.6% for aerated concrete blocks (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Strength and Shrinkage of Concrete Blocks).
Incorrect
The average drying shrinkage of a sample must not exceed 0.6% for aerated concrete blocks (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Strength and Shrinkage of Concrete Blocks).
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Question 4 of 30
4. Question
Generally for boundary wall or fence not exceeding 1.8m high, brick or block must not be less than
Correct
Generally for boundary wall or fence not exceeding 1.8m high, brick or block must not be less than 100mm thick. if exceeding 1.8m high but less than 3m high, wall thickness is not to be less than 225mm thick (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Cavity Wall).
Incorrect
Generally for boundary wall or fence not exceeding 1.8m high, brick or block must not be less than 100mm thick. if exceeding 1.8m high but less than 3m high, wall thickness is not to be less than 225mm thick (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Cavity Wall).
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Question 5 of 30
5. Question
Certain impurities in water are permissible, which of the following is not correct?
i. Chlorides must not exceed 1000mg per litre
ii. Sulphates shall not exceed 1000mg of sulphur trioxide per litre
iii. Alkali carbonates and bicarbonates shall not exceed 1000mg per litreCorrect
Certain impurities in water are permissible. Chlorides must not exceed 50mg per litre. Sulphates shall not exceed 1000mg of sulphur trioxide per litre. Alkali carbonates and bicarbonates shall not exceed 1000mg per litre (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Water).
Incorrect
Certain impurities in water are permissible. Chlorides must not exceed 50mg per litre. Sulphates shall not exceed 1000mg of sulphur trioxide per litre. Alkali carbonates and bicarbonates shall not exceed 1000mg per litre (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Water).
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Question 6 of 30
6. Question
Concrete block is constructed of mixes as
Correct
Concrete block is constructed of mixes as 1 part Portland cement, 2 parts clean washed sand, 3 parts granite fines plus 5 parts 10mm granite aggregate (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Materials).
Incorrect
Concrete block is constructed of mixes as 1 part Portland cement, 2 parts clean washed sand, 3 parts granite fines plus 5 parts 10mm granite aggregate (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Materials).
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Question 7 of 30
7. Question
Which of the following operates as pore fillers combined with water repellent chemicals?
Correct
The waterproofing materials available are also thus categorized:
i. Integral waterproofers as addictives to cementitious mixes, e.g., concrete, mortars. These operate as pore fillers combined with water repellent chemicals (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Waterproofing (Besides Roofing)).Incorrect
The waterproofing materials available are also thus categorized:
i. Integral waterproofers as addictives to cementitious mixes, e.g., concrete, mortars. These operate as pore fillers combined with water repellent chemicals (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Waterproofing (Besides Roofing)). -
Question 8 of 30
8. Question
The maximum permissible moisture content in timbers with one side to the exterior of the building and one side to the interior is
Correct
The maximum permissible moisture content in timbers:
– Timbers with one side to the exterior of the building and one side to the interior 20% (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.8 – Carpentry, Joinery, and ironmongery – Materials).Incorrect
The maximum permissible moisture content in timbers:
– Timbers with one side to the exterior of the building and one side to the interior 20% (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.8 – Carpentry, Joinery, and ironmongery – Materials). -
Question 9 of 30
9. Question
Stone pavings are built with thickness between
Correct
Stone pavings are built with thickness between 50 to 150mm. For large slabs, a bedding of dry sand is required. For smaller units, a bedding of 1:3 cement/sand mortar is used (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.6 – Masonry and Granite/Marble Works – Traditional Masonry).
Incorrect
Stone pavings are built with thickness between 50 to 150mm. For large slabs, a bedding of dry sand is required. For smaller units, a bedding of 1:3 cement/sand mortar is used (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.6 – Masonry and Granite/Marble Works – Traditional Masonry).
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Question 10 of 30
10. Question
As a guidance, for concrete surfaces, variation from vertical plumb for each storey can be
Correct
As a guidance, for concrete surfaces, variation from vertical plumb can be 9mm for each storey. Variation from the horizontal is set to a maximum 6mm in 6000mm. For columns and beans, the tolerance is minus 6mm and plus 12mm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Tolerances).
Incorrect
As a guidance, for concrete surfaces, variation from vertical plumb can be 9mm for each storey. Variation from the horizontal is set to a maximum 6mm in 6000mm. For columns and beans, the tolerance is minus 6mm and plus 12mm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Tolerances).
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Question 11 of 30
11. Question
Accessible roofs are required to be protected by
Correct
Accessible roofs are required to be protected by parapet or railing not less than 1100mm in height from finished roof level and so constructed at to prevent climbing or passage of objects more than 100mm in their smallest dimension (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Roofing in General).
Incorrect
Accessible roofs are required to be protected by parapet or railing not less than 1100mm in height from finished roof level and so constructed at to prevent climbing or passage of objects more than 100mm in their smallest dimension (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Roofing in General).
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Question 12 of 30
12. Question
Boarded strip flooring is of teak or other hardwood with finished thickness as
Correct
Boarded strip flooring is of teak or other hardwood with finished thickness as 20mm minimum (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.8 – Carpentry, Joinery, and Ironmongery – Flooring).
Incorrect
Boarded strip flooring is of teak or other hardwood with finished thickness as 20mm minimum (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.8 – Carpentry, Joinery, and Ironmongery – Flooring).
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Question 13 of 30
13. Question
Which of the following sealant is suitable for temporary structures that undergo little or no movement?
Correct
Oil-extended or oil-based caulks are suitable for temporary structures that undergo little or no movement. Life expectancy is 2 to 10 years. Failure occurs by hardening, shrinkage, and cracking. Movement is up to 5% joint width (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Sealants).
Incorrect
Oil-extended or oil-based caulks are suitable for temporary structures that undergo little or no movement. Life expectancy is 2 to 10 years. Failure occurs by hardening, shrinkage, and cracking. Movement is up to 5% joint width (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Sealants).
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Question 14 of 30
14. Question
Which of the following statement is true?
Correct
For infill brickwork or blockwork, a 300mm wide metal lath is installed across the joint between the brick/blockwork and concrete before plaster is applied to prevent future cracks along the joints
Tolerance for blockwork is set at ±10mm for setting out dimensions and vertical plumb in any storey height (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Workmanship).Incorrect
For infill brickwork or blockwork, a 300mm wide metal lath is installed across the joint between the brick/blockwork and concrete before plaster is applied to prevent future cracks along the joints
Tolerance for blockwork is set at ±10mm for setting out dimensions and vertical plumb in any storey height (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Workmanship). -
Question 15 of 30
15. Question
The slump is measured by determining
Correct
The slump is measured by determining the difference between the mould height and the highest point of the specimen being tested (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Slump Test).
Incorrect
The slump is measured by determining the difference between the mould height and the highest point of the specimen being tested (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Slump Test).
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Question 16 of 30
16. Question
For external wall finished with rendering and filing works, movement joint separated at the rendering base are provided at about
Correct
For external wall finished with rendering and filing works, movement joint separated at the rendering base are provided at about 3m x 3m horizontally and vertically or at each storey interval, especially for high-rise structure where the risk of fallen object is high (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Expansion Joints).
Incorrect
For external wall finished with rendering and filing works, movement joint separated at the rendering base are provided at about 3m x 3m horizontally and vertically or at each storey interval, especially for high-rise structure where the risk of fallen object is high (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Expansion Joints).
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Question 17 of 30
17. Question
In any case, structural timbers shall not exceed the moisture content of
Correct
In any case, structural timbers shall not exceed 22% moisture content (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.8 – Carpentry, Joinery, and Ironmongery – Materials).
Incorrect
In any case, structural timbers shall not exceed 22% moisture content (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.8 – Carpentry, Joinery, and Ironmongery – Materials).
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Question 18 of 30
18. Question
Aluminium corrugated sheets are
Correct
Steel corrugated sheets are hot-dipped galvanized, at least 0.6mm thick with corrugations 76mm wide and 19mm deep. Fixing is by self-tapping galvanized steel screws and bolts. Aluminium corrugated sheets are similar to steel sheets (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Metal Roofing).
Incorrect
Steel corrugated sheets are hot-dipped galvanized, at least 0.6mm thick with corrugations 76mm wide and 19mm deep. Fixing is by self-tapping galvanized steel screws and bolts. Aluminium corrugated sheets are similar to steel sheets (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Metal Roofing).
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Question 19 of 30
19. Question
Bricks or blocks are laid on a full bed of mortar with the joints filed solid to a consistent thickness of
Correct
Bricks or blocks are laid on a full bed of mortar with the joints filed solid to a consistent thickness of 10mm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Workmanship).
Incorrect
Bricks or blocks are laid on a full bed of mortar with the joints filed solid to a consistent thickness of 10mm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Workmanship).
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Question 20 of 30
20. Question
Shallow foundation includes the following except
Correct
According to the depth of the bearing strata, foundations can be classified as shallow or deep, Generally, shallow foundation go to approximately 5m and support a load of 50 to 300 KPa. Shallow foundation includes spread footing, strip footing, raft foundation, and grillage foundation. Deep foundation includes piling, caissons, and bored piles (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.4 – An Outline of Foundation System in Hong Kong – Foundation Types).
Incorrect
According to the depth of the bearing strata, foundations can be classified as shallow or deep, Generally, shallow foundation go to approximately 5m and support a load of 50 to 300 KPa. Shallow foundation includes spread footing, strip footing, raft foundation, and grillage foundation. Deep foundation includes piling, caissons, and bored piles (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.4 – An Outline of Foundation System in Hong Kong – Foundation Types).
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Question 21 of 30
21. Question
For larger size units, the average crushing strength of 10 blocks will not be less than
Correct
For block work not exceeding 337.5 x 225 x 112.5mm, the average crushing of blocks will not be less than 7.0N/sq mm. For larger size units, the average crushing strength of 10 blocks will not be less than 2.8N/sq mm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Strength and Shrinkage of Concrete Blocks).
Incorrect
For block work not exceeding 337.5 x 225 x 112.5mm, the average crushing of blocks will not be less than 7.0N/sq mm. For larger size units, the average crushing strength of 10 blocks will not be less than 2.8N/sq mm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Strength and Shrinkage of Concrete Blocks).
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Question 22 of 30
22. Question
Polysulfides are cheap and popular and can move up to
Correct
Polysulfides are cheap and popular and can move up to ±25% joint width. Other than steel, glass, and aluminium, priming is required on the substrates. Application on glass windows is quite common (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Sealants).
Incorrect
Polysulfides are cheap and popular and can move up to ±25% joint width. Other than steel, glass, and aluminium, priming is required on the substrates. Application on glass windows is quite common (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Sealants).
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Question 23 of 30
23. Question
The waterproofing materials available are categorized into
i. Pre-packed integral waterproofers
ii. Polymer modified cementitious systems
iii. Internal waterproof renderingsCorrect
The waterproofing materials available are also thus categorized:
i. Integral waterproofers as addictives to cementitious mixes, e.g., concrete, mortars. These operate as pore fillers combined with water repellent chemicals.
ii. Pre-packed integral waterproofers requiring only addition of water at site which makes site mixing simple. These contain active chemicals reacting with free calcium in the substrate to form insoluble crystals which block the capillaries preventing the ingress of water.
iii. Polymer modified cementitious systems as emulsions when used in cement sand mixes the emulsion breads down to form a fibrous lattice with the mortar structure affording improved adhesion, flexural strength, and reduced permeability.
iv. Emulsions based on bitumen or bitumen/rubber designed to provide either waterproof external coatings or waterproof membranes. These should be covered with a screed protections.
v. External water repellants based on silicone resins or stearate complexes design to repel rain from permeating into vertical surfaces. However, these allow the release of dampness from within the substrate.
(Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Waterproofing (Besides Roofing)).Incorrect
The waterproofing materials available are also thus categorized:
i. Integral waterproofers as addictives to cementitious mixes, e.g., concrete, mortars. These operate as pore fillers combined with water repellent chemicals.
ii. Pre-packed integral waterproofers requiring only addition of water at site which makes site mixing simple. These contain active chemicals reacting with free calcium in the substrate to form insoluble crystals which block the capillaries preventing the ingress of water.
iii. Polymer modified cementitious systems as emulsions when used in cement sand mixes the emulsion breads down to form a fibrous lattice with the mortar structure affording improved adhesion, flexural strength, and reduced permeability.
iv. Emulsions based on bitumen or bitumen/rubber designed to provide either waterproof external coatings or waterproof membranes. These should be covered with a screed protections.
v. External water repellants based on silicone resins or stearate complexes design to repel rain from permeating into vertical surfaces. However, these allow the release of dampness from within the substrate.
(Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Waterproofing (Besides Roofing)). -
Question 24 of 30
24. Question
Limitations of cavity wall include, every external wall of a building shall be constructed of
Correct
Limitations
Every external wall of a building shall be constructed of
i. masonry not less than 225mm thick
ii. plain concrete or reinforced concrete not less than 100mm thick
(Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Cavity Wall).Incorrect
Limitations
Every external wall of a building shall be constructed of
i. masonry not less than 225mm thick
ii. plain concrete or reinforced concrete not less than 100mm thick
(Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.5 – Brickwork and Block Work – Cavity Wall). -
Question 25 of 30
25. Question
Which of the following is true about fine aggregate?
Correct
As fine aggregate at least 90 percent by mass will pass a 5mm mesh screen and not more than 15 percent by mass will pass a 150mm mesh (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Aggregate).
Incorrect
As fine aggregate at least 90 percent by mass will pass a 5mm mesh screen and not more than 15 percent by mass will pass a 150mm mesh (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.3 – Concrete Work – Aggregate).
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Question 26 of 30
26. Question
Which of the following statement is true about Bitumen Felt Built-Up Roofing?
Correct
On a concrete roof, a cement-sand screed makes up the base. Then a coat of bitumen primer is brushed on and allowed to dry. The first bitumen felt layer is partially bonded to the base at perimeter and in spots or strips with hot bitumen-based bonding compound at the rate of 0.5kg/sq m. Subsequent layers then fully bonded with an even coating of hot bonding compound at the rate of 1.5 kg/sq m. The final surface is dressed with bitumen compound applied at the rate of 3 kg/sq m dressed immediately with stone chippings lightly rolled in at the rate of 15kg/sqm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Bitumen Felt Built-Up Roofing).
Incorrect
On a concrete roof, a cement-sand screed makes up the base. Then a coat of bitumen primer is brushed on and allowed to dry. The first bitumen felt layer is partially bonded to the base at perimeter and in spots or strips with hot bitumen-based bonding compound at the rate of 0.5kg/sq m. Subsequent layers then fully bonded with an even coating of hot bonding compound at the rate of 1.5 kg/sq m. The final surface is dressed with bitumen compound applied at the rate of 3 kg/sq m dressed immediately with stone chippings lightly rolled in at the rate of 15kg/sqm (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Bitumen Felt Built-Up Roofing).
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Question 27 of 30
27. Question
Failure by hardening, shrinkage, and cracking is possible in which of the following sealants?
Correct
Oil-extended or oil-based caulks are suitable for temporary structures that undergo little or no movement. Life expectancy is 2 to 10 years. Failure occurs by hardening, shrinkage, and cracking. Movement is up to 5% joint width (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Sealants).
Incorrect
Oil-extended or oil-based caulks are suitable for temporary structures that undergo little or no movement. Life expectancy is 2 to 10 years. Failure occurs by hardening, shrinkage, and cracking. Movement is up to 5% joint width (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Sealants).
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Question 28 of 30
28. Question
Ashlar walling consists
Correct
Ashlar walling consists of stone finely worked to a plane surface and generally laid in a square or grid pattern. Mortar bed is composed of cement and fine crushed stone 1:3 with 5mm joints (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.6 – Masonry and Granite/Marble Works – Traditional Masonry).
Incorrect
Ashlar walling consists of stone finely worked to a plane surface and generally laid in a square or grid pattern. Mortar bed is composed of cement and fine crushed stone 1:3 with 5mm joints (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.6 – Masonry and Granite/Marble Works – Traditional Masonry).
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Question 29 of 30
29. Question
Common piles are of
Correct
Common piles are of 305mm x 305mm serial size and 110 to 223kg per metre (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.4 – An Outline of Foundation System in Hong Kong – Deep Foundations – Piling).
Incorrect
Common piles are of 305mm x 305mm serial size and 110 to 223kg per metre (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.4 – An Outline of Foundation System in Hong Kong – Deep Foundations – Piling).
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Question 30 of 30
30. Question
For parapet and fence walls,
Correct
For parapet and fence walls, joints at approximate 30m interval separating the structure will allow movements (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Expansion Joints).
Incorrect
For parapet and fence walls, joints at approximate 30m interval separating the structure will allow movements (Building Materials and Technology in Hong Kong – Chapter 2 – Trades of Materials and Technology – 2.7 – Roofing, Waterproofing, and Expansion Joints – Expansion Joints).