HKIA Exam Paper 3 Quiz 45

Heavy duty, high security locks, and electrical solenoid locks shall have equivalent of 19mm (minimum) throw stainless steel, three part, low friction, guided latch bolts with anti-thrust devices and/or 25mm (minimum) throw deadbolts with hardened steel rollers, as appropriate (General for Building 2017 Edition – Section 14 – Ironmongery – Locks – 14.59).

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).

Dry density and cohesion/adhesion properties of sprayed material;
For general area:
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).

Actual stone thickness shall be nominal thickness ±2.0 mm (General for Building 2017 Edition – Section 16 – Curtain Walls – Stone – 16.14).

i. The allowable load capacity of piles for loads along the vertical axis must be such that the average compressive stress imposed by this loading does not exceed 25% (20% only for precast concrete piles) of the design grade strength of the concrete or 7.5 MPa whichever is smaller, of the nominal cross-sectional area of precast concrete piles or the cross-sectional area of the tube or auger for cast in-situ concrete piles. The effect of reinforcement shall not be included in the calculation of the allowable load capacity.
ii. The allowable load capacity of precast prestressed tubular piles for loads along the vertical axis must be such that the average compressive stress imposed by this loading does not exceed 25% of the design grade strength of the concrete less the prestress after losses.
iii. The allowable load capacity of steel ‘H’ piles (for a driving resistance of 2) for loads along the vertical axis must be such that the average compressive stress imposed by this loading does not exceed 30% of the yield stress appropriate to the type of steel and thickness given in Table (General for Building 2017 Edition – Section 5 – Piling Work – Allowable Load Capacity of Piles – 5.04).

Glass fibre insulating board shall be semi-rigid resin-bonded glass fibre weighing 45-48 kg/m3 (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Semi-Rigid Resin Bonded Glass Fibre Slab – 13.19).

Fire safing is to be compressed 20% to 30% (General for Building 2017 Edition – Section 16 – Curtain Walls – Thermal Insulation and Fire-Safing Insulation – 16.22).

Capping sealant shall be a one part gun grade neutral curing silicone elastomeric sealant (General for Building 2017 Edition – Section 16 – Curtain Walls – Sealants – 16.21).

When specified, provide fire protection to structural steel by one of the following materials or system:
i. Sprayed mineral coating to BS 8202-1;
ii. Intumescent coating system to BS EN 16623; or
iii. Proprietary fire protection board (General for Building 2017 Edition – Section 15 – Structural Steel Work – Fire Protection System – 15.67).

The percentage of the total cross-sectional area of steel reinforcing bars lengthened by couplers at any one section shall not be greater than 50% and the couplers should normally be arranged symmetrically with minimum spacing between couplers of 500 mm c/c along the pile. Also, mechanical couplers shall not be used within the prebored hole formed in bedrock (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).

Concrete curing compound for carriageways shall be a non-pigmented liquid resin or wax-resin base membrane curing compound of a proprietary brand. It shall achieve a 96% efficiency index and shall be available both with or without a fugitive dye (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Concrete Curing Compound – 6.37).

Inorganic soil shall be free from organic matter and shall contain not more than 30% of soil particles passing a 63 µm BS test sieve (General for Building 2017 Edition – Section 3 – Excavation and Earthwork – Soil-Cement – 3.27).

Fix steel mesh at 75 mm centres as follows:
a To steel framing by,
i. Tack welding.
ii. Tying with 2 mm galvanized tying wire.
b. To wood framing with 1.8 x 25 mm galvanized staples (General for Building 2017 Edition – Section 17 – Metalwork – Fixing Steel Mesh – 17.30).

Cementitious content is the combined mass of cement, Condensed Silica Fume (CSF) and either Pulverized-fuel ash (PFA) or Ground Granulated Blastfurnace Slag (GGBS) per cubic metre of compacted concrete. For Condensed Silica Fume (CSF), the dry mass shall be used (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Cementitious Content – 6.31).

At connections subject to thermal movement or other movements, separate all pairs of moving surfaces with friction reducing pads. Pads shall be minimum 3 mm thick, sufficiently capable of reducing friction to permit movement and shall also reduce movement noise to a level acceptable to the Architect, shall be resistant to wear and positively retained in position (open ended slots shall not be acceptable). Pads shall not be subjected to heat damage from welding or cutting or to excessive pressure from over-tightening of bolts (General for Building 2017 Edition – Section 16 – Curtain Walls – Shims – 16.19).

Drillholes for pile shall not be oversized by more than 20 mm (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).

Supply concrete in sufficient quantities to ensure that concreting of each pile proceeds without interruption. The concrete shall have a minimum cement content of 400 kg/m3 and a minimum slump of 150 mm (General for Building 2017 Edition – Section 5 – Piling Work – Large Diameter Bored Piles – 5.19).

Strength of embedded anchors shall be developed by integral projections or by welded deformed bars or headed studs (General for Building 2017 Edition – Section 16 – Curtain Walls – Anchors in Concrete and Masonry – 16.17).

Do not fix laminated plastic sheet to timber with moisture content of more than 16% (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Fixing plastic sheet – 13.44).

Interior window sill trim shall not deflect more than 3.2 mm when subjected to a concentrated force of 111 N at any point. Residual deflection after removal of force shall not exceed 1.6 mm.
(General for Building 2017 Edition – Section 16 – Curtain Walls – Criteria for Interior Trim – 16.61).

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).

Sealant back-up materials shall be polyethylene foam, urethane foam or extruded silicone as recommended by sealant manufacturer (General for Building 2017 Edition – Section 16 – Curtain Walls – Sealants – 16.21).

Wind pressures act perpendicular to tangents of curved surfaces (General for Building 2017 Edition – Section 16 – Curtain Walls – Structural Requirements – 16.46).

Plate washers shall be used for connections with long slotted and oversized holes. Tightening maybe by one of the following methods :
i. The torque-control method using a calibrated power-operated or a hand-operated torque wrench to the minimum preloading force
ii. The direct tension indicator method using approved proprietary load indicators (General for Building 2017 Edition – Section 15 – Structural Steel Work – High Strength Friction Grip Bolts – 15.42).

The allowable load capacity of the individual pile shall not exceed 1400 kN (General for Building 2017 Edition – Section 5 – Piling Work – Minipiles – 5.21).

Unless otherwise stated:
a. Bottom bolts shall be 150mm minimum long.
b. Top bolts to doors up to 2000mm high shall be 150mm long. For taller doors, increase bolt length by 150mm for each 150mm of additional height, or part thereof. For very tall doors, automatic flush bolts may be substituted (General for Building 2017 Edition – Section 14 – Ironmongery – Bolts – 14.88).

Granite chippings shall be best quality grey granite free from brown and partially decomposed stone graded to pass a 5.00 mm mesh BS sieve and be retained on a 2.36 mm mesh BS sieve (General for Building 2017 Edition – Section 12 – Roofing – Chipping finish – 12.57).

Hardwood weather boarding shall be 150 mm wide and tapering from 25 mm to 10 mm thick and shall be:
a. Sawn boarding or boarding wrot on one face and two edges with horizontal joints lapped 30 mm.
b. Boarding as (a) but with wider edge rebated with joints lapped 20 mm (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Weather Boarding – 13.11).

The flakiness index when determined to CS3 shall not exceed 40 for aggregate of 40 mm size or larger or 35 for sizes of 10 to 28 mm (General for Building 2017 Edition – Section 6 – Structural Concrete Work – Aggregates – 6.33).

The primer for corrosion protection must be compatible with the steel substrate and the basecoat and must provide excellent adhesion at all times (General for Building 2017 Edition – Section 15 – Structural Steel Work – Intumescent Coating System – 15.70).