Author Topic: CORRECT: 2025 NABTEB BLOCKLAYING, BRICKLAYING & CONCRETING ANSWERS (OBJ & ESSAY) (Read 9079 times)

MANDINHO · « **on:** June 22, 2025, 10:04:11 pm »

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BLOCKLAYING, BRICKLAYING & CONCRETING SUBSCRIPTION

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MANDINHO · « **Reply #1 on:** June 23, 2025, 02:23:49 pm »

NABTEB BRICKLAYING/ BLOCKLAYING AND CONCRETING ANSWERS

BRICKLAYING/BLOCKLAYING & CONCRETING-OBJ!
01-10: BBBDDBABBB
11-20: AABAAACDDA
21-30: AABCDDAACB
31-40: BCBAABACCD

COMPLETED
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INSTRUCTIONS: ANSWER FIVE QUESTIONS ONLY.

(1a)
Floor area = 96 m²
Tile size = 150 mm × 150 mm
Tile size = 0.15 m × 0.15 m
Area of one tile = 0.15 × 0.15
Area of one tile = 0.0225 m²
Number of tiles = 96 ÷ 0.0225
Number of tiles = 4266.67
Number of tiles = 4267 tiles

(b)
Cost of tiles with 5% wastage:
Effective area including 5% wastage = 96 × 1.05
Effective area = 100.8 m²
Cost per m² = ₦80.00
Total cost = 100.8 × 80
Total cost = ₦8,064.00
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(2i)
Straight edge: A straight edge is a long, straight tool made of wood, metal, or plastic used to check the evenness or levelness of surfaces like concrete, plaster, or screed. It helps in leveling and aligning construction surfaces during finishing.

(2ii)
Slump: Slump refers to the measure of consistency or workability of fresh concrete. It is determined using the slump test, where concrete is filled into a cone-shaped mold and then the decrease in height after the cone is lifted is measured. It indicates how easily concrete flows.

(2iii)
Weep hole: A weep hole is a small opening provided at the bottom of retaining walls, parapet walls, or external walls to allow water to drain out. It prevents water accumulation and reduces pressure buildup behind the wall.

(2iv)
Quartering gauge: Quartering gauge is a method used to reduce a bulk sample of materials like sand, gravel, or soil to a smaller representative portion by dividing it into quarters. It ensures accuracy in testing by selecting a uniform sample.
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(3a)
(i) Blockage in the chimney flue
(ii) Insufficient air supply for combustion
(iii) Poor chimney design or construction
(iv) Use of wet or unseasoned firewood
(v) Downdraught caused by surrounding structures or wind direction
(vi) Inadequate chimney height

(3b)
Chimney pots are built to improve the draft of a chimney by increasing its height and narrowing the opening at the top. This helps smoke and gases escape more efficiently, prevents downdraughts, and enhances the overall performance of the fireplace or stove. They also help reduce the entry of rain and animals into the chimney.
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(4a)
The door leaf is fixed to the door frame using hinges. First, the hinge positions are marked on both the door frame and the edge of the door leaf. Mortises are then chiseled out at these marks to allow the hinges to sit flush. The hinges are screwed onto the door leaf and then aligned with the frame. Finally, the other side of each hinge is screwed into the frame, allowing the door to swing freely. The alignment is checked to ensure smooth operation and proper fit within the frame.

(4b)
(Draw the diagram)

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(5a)
Buckling of bricks refers to the deformation or bending of brick walls or columns due to compressive forces that exceed the structural capacity of the brickwork. It usually occurs when slender brick elements are subjected to axial loads without adequate lateral support, leading to instability and failure.

(5b)
(i) Compressive Strength: Bricks must have high compressive strength to bear loads without crushing. Good quality bricks have a minimum strength of about 3.5 N/mm², making them suitable for load-bearing structures.
(ii) Water Absorption: Bricks should have low water absorption: It should not exceed 20% of their dry weight when soaked in water for 24 hours. This prevents moisture penetration that can weaken the structure or cause dampness.
(iii) Hardness: Good bricks should be hard: When scratched with a sharp object, they should not show any visible marks. Hardness ensures resistance to abrasion and wear, especially in exposed locations.
(iv) Durability: Bricks should be durable: They must withstand weathering actions such as rain, wind, and temperature changes without disintegrating. Durable bricks maintain structural integrity over time.
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(6a)
(i) Lightweight construction: Hollow blocks reduce the overall weight of the wall, making it easier to handle and reducing the load on the foundation.
(ii) Improved insulation: The air space within the hollow blocks provides better thermal and sound insulation, enhancing energy efficiency and noise reduction.
(iii) Economical use of materials: Less concrete is needed to produce hollow blocks compared to solid ones, leading to cost savings in materials.
(iv) Ease of installation: Hollow blocks allow for easier routing of electrical and plumbing services through the cavities without extensive chiseling.
(v) Better bonding with mortar: The surfaces and edges of hollow blocks provide a better grip for mortar, resulting in stronger and more stable walls.

(6b)
Water can be prevented from percolating through walls by applying a water-resistant render or plaster, ensuring proper curing of mortar and concrete, using damp-proof courses, installing overhangs or coping to deflect water, and maintaining good drainage systems around the building to prevent water accumulation near the walls.

(6c)
The materials for blocks are semi-dry during production to ensure they retain their shape immediately after molding without slumping or deformation. This consistency allows the blocks to be demolded and stacked quickly for curing, speeds up production, reduces drying time, and results in a more compact, durable product with fewer cracks and shrinkage issues.
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(7a)
(Draw the diagram)

(7b)
(i) Measuring tape
(ii) Builder’s square
(iii) Spirit level
(iv) Line and pegs
===========================

COMPLETED

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Author Topic: CORRECT: 2025 NABTEB BLOCKLAYING, BRICKLAYING & CONCRETING ANSWERS (OBJ & ESSAY) (Read 9079 times)

MANDINHO

CORRECT: 2025 NABTEB BLOCKLAYING, BRICKLAYING & CONCRETING ANSWERS (OBJ & ESSAY)

MANDINHO

Re: CORRECT: 2025 NABTEB BLOCKLAYING, BRICKLAYING & CONCRETING ANSWERS (OBJ & ESSAY)

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