HKIA Exam Paper 6 Quiz 06

Well-graded material shall consist of material that has a coefficient of uniformity exceeding 10 (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01).

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).

Provide 5 mm expansion gap at perimeter of areas of wood block flooring, and fill with one of the following:
a. Cork strip
b. Foam rubber strip (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Wood Block Flooring – 13.50).

Surfaces to which tanking is to be applied shall be level and free from irregularities such as ridges, dips, fins and concrete or mortar droppings (General for Building 2017 Edition – Section 11 – Tanking – Surface Preparation for Sheet Membrane – 11.08.01).

Caulking sealant shall be either:
a. One part gun grade neutral curing silicone elastomeric sealant or
b. One part gun grade moisture curing modified polyurethane.
The preferred caulking sealant shall be a one part gun grade neutral curing silicone elastomeric sealant meeting the performance requirements (General for Building 2017 Edition – Section 16 – Curtain Walls – Sealants – 16.21).

The relative compaction (RC) of filling material shall be determined in accordance with the following equation:
RC = IDD/MDD x l00%
where:
– IDD is the in-situ dry density determined in accordance with Clause 3.21
– MDD is the maximum dry density determined in accordance with Clause 3.21 (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Compaction by Performance Specification – 3.19).

Facing bricks to have the following properties in accordance with ASTM C216:
1. Compressive strength, the average compressive strength of 5 bricks must exceed 20.7 MPa; while the individual should not be less than 17.2 MPa.
2. Saturation coefficient cannot exceed 0.78.
3. Chippage, 85% to 100% of the brick can have chips that are measured from an edge that range between 0 to 7.9 mm and measured from a corner that range between 0 to 12.7 mm. No more than 15% of the brick can have chips that are measured from an edge that range between 7.9 to 11.1 mm and measured from a corner that range between 12.7 to 19.1 mm. The cumulative length of the chips around the perimeter edges of face cannot exceed 10% of the perimeter length
4. The faces shall be free of cracks or imperfections when viewed from a distance of 6 meters (General for Building 2017 Edition – Section 9 – Brickwork and Blockwork – Facing bricks – 9.03).

Unless other specified, the minimum design differential movements shall be:-
i. Lateral movement is 1/500 per increment of height.
ii. Vertical shortening of column/wall under load is 2 mm per storey.
iii. Vertical deflection of supporting beam/slab is L/350 or 20 mm whichever is the lesser. (Where L is the span or length in the case of a cantilever.)
iv. Thermal movements are movements arising from temperature variations stipulated in GS 16.56.
(General for Building 2017 Edition – Section 16 – Curtain Walls – Floor Sag and other Movements – 16.55)

Dry density and cohesion/adhesion properties of sprayed material;
For general area:
The dry density of the sprayed material shall not be less than 240 kg/m3
The cohesion/adhesion of the sprayed material shall have a minimum 0.01 MPa onto primed steelwork under site tests in accordance with ASTM E736. (General for Building 2017 Edition – Section 15 – Structural Steel Work – Sprayed Mineral Coating – 15.69).

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).

Rock is a hard material which in the opinion of the SO can only be removed by the use of blasting, wedges or pneumatic drills and shall include individual boulders or other masses exceeding 0.20 m3 in size (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01).

Door viewers shall have viewing angle not less than 180 degrees (General for Building 2017 Edition – Section 14 – Ironmongery – Door Viewer – 14.97).

The centre to centre spacing of piles shall not be less than 750 mm or 2 times the outer diameter, whichever is the greater for minipiles and the perimeter of the drill hole formed in bedrock for RSSHP (General for Building 2017 Edition – Section 5 – Piling Work – Minimum Spacing/Numbers of Piles – 5.08).

The watertightness test is passed if the drop is less than 1/500 the average water depth or 10 mm whichever is the least (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Water Tanks – 6.63).

Wind pressures act perpendicular to flat surfaces, regardless of surface orientation (General for Building 2017 Edition – Section 16 – Curtain Walls – Structural Requirements – 16.46).

Grout vents for entry and outlet points shall have:
a. An internal diameter of 20 mm minimum.
b. Approved connections suitable for the attachment of the feed from the grout pump.
c. High pressure taps or similar approved taps which permit their closure without reducing the pumping pressure (General for Building 2017 Edition – Section 7 – Prestressed Concrete Work – Grout Vents – 7.21).

Teak, which is only permitted to be specified in special circumstances, shall have a density of 650 kg/m3 (minimum) at 15% moisture content (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Teak – 13.07).

Testing of Grout
Employ an approved independent laboratory to carry out the tests for Bleeding, Free Expansion, and Flow Cone Efflux of grout (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).

In addition to the loads given in the loading schedule, the weight of pile caps or backfill over the pile caps and the imposed load over the plan area of the pile caps, which shall be taken as 7.5 kN/m2 unless specified otherwise, shall be included in the pile loading (General for Building 2017 Edition – Section 5 – Piling Work – General – 5.01).

Sand finishing shall be fine, clean, and the particles of which must pass a 600 µm mesh BS sieve and be retained on a 300 µm mesh BS sieve (General for Building 2017 Edition – Section 12 – Roofing – Sand finishing – 12.56).

Slotted steel angle shall be self-finished angle (General for Building 2017 Edition – Section 17 – Metalwork – Slotted Steel Angle – 17.05).

The soluble sulphate content of the suitable material placed within 500 mm of concrete, cement bound material, or cementitious material shall not exceed l.9 grams of sulphate, expressed as SO3, per litre (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01).

Mosquito gauze shall be one of the following:
i. Plastic covered glass fibre 7 x 7 mesh per 10 mm square.
ii. Copper wire 11 x 11 mesh per 10 mm square (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Mosquito Gauze – 13.31).

Rubble of random shapes and sizes in random rubble walling shall be bonded together over each face of the wall. Rubble shall be selected and rough dressed to keep joint widths to a minimum. 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 (see Diagram A). No more than 3 nos. rubble shall be adjacent to a vertical joint (General for Building 2017 Edition – Section 10 – Masonry – Random Rubble – 10.12).

Concrete curing compound for structures shall be a liquid resin or wax-resin base membrane curing compound of an approved proprietary brand. It shall have a minimum curing efficiency of 85% and shall contain a fugitive dye. The curing compound shall degrade completely within 3 weeks after application and the concrete surface so treated shall not impair the bonding of applied finishes (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Concrete Curing Compound – 6.37).

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 (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Generally – 6.01).

The nominal thickness of the stone shall be determined by the specified tests and design rules but shall not be less than as specified. These tests must include for flexural strength test in accordance with ASTM C880/C880M and anchorage test in accordance with ASTM C1354/C1354M. Determination method for thickness should follow accepted methods (e.g. CWCT Recommendations) (General for Building 2017 Edition – Section 16 – Curtain Walls – Stone – 16.14).

Chemical test for recycled water;
a. Chloride content
– prestressed concrete steam-cured structural concrete
– concrete with reinforcement or other embedded metal
b. Sulphate content (as SO4)
c. Acid-soluble alkali content (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Table 6.12).

General duty locks shall have equivalent of 11mm (minimum) plated brass latch bolts and 13mm (minimum) plated brass deadbolts, with hardened steel rollers (General for Building 2017 Edition – Section 14 – Ironmongery – Locks – 14.60).

General filling material shall be “suitable material”. It may contain up to 25% rock distributed evenly throughout the whole mass of the material. General filling material shall contain no material exceeding 200 mm in size (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Definitions – 3.01).