BCE Construction & Building Materials 4 — Questions and Answers
Question 1: Which roofing material is classified as a Built-Up Roof (BUR) system?
- Standing seam metal panels
- Multiple layers of bitumen and reinforcing felts (Correct answer)
- Single-ply EPDM membrane
- Architectural asphalt shingles
Correct answer: Multiple layers of bitumen and reinforcing felts
BUR systems consist of multiple alternating plies of roofing felt saturated with bitumen, forming a continuous waterproof membrane.
Question 2: In masonry construction, what is the purpose of a 'weep hole'?
- Ventilate the cavity to remove moisture (Correct answer)
- Anchor the veneer to the backup wall
- Allow thermal expansion
- Control crack location
Correct answer: Ventilate the cavity to remove moisture
Weep holes at the base of a cavity wall allow moisture that penetrates or condenses in the cavity to drain out and the cavity to vent and dry.
Question 3: What is the key difference between Type I/II and Type III Portland cement?
- Type III has lower C3S content for durability
- Type III is ground finer for faster strength gain (Correct answer)
- Type III contains fly ash as a replacement
- Type III is sulfate-resistant
Correct answer: Type III is ground finer for faster strength gain
Type III cement is ground to a finer particle size, increasing surface area for faster hydration and early strength gain (e.g., for rapid formwork removal).
Question 4: What does the LEED rating system category 'Materials & Resources' primarily address?
- Indoor air quality from material off-gassing
- Reducing embodied carbon and construction waste (Correct answer)
- Water-efficient landscaping
- Energy use in mechanical systems
Correct answer: Reducing embodied carbon and construction waste
The M&R category credits projects for waste reduction, use of recycled content, regional materials, and life-cycle impact assessment of building products.
Question 5: Which property of a material is measured by the Brinell Hardness Test (BHN)?
- Tensile strength
- Resistance to plastic indentation (Correct answer)
- Ductility
- Fracture toughness
Correct answer: Resistance to plastic indentation
The BHN test measures a material's resistance to permanent surface deformation by pressing a hardened steel ball under a known load.
Question 6: In soil-cement base construction, Portland cement is mixed with soil primarily to improve which property?
- Drainage capacity
- Compressive strength and stiffness (Correct answer)
- Frost resistance only
- Color uniformity
Correct answer: Compressive strength and stiffness
Cement stabilization binds soil particles together, dramatically increasing the unconfined compressive strength and load-bearing stiffness of weak subgrade soils.
Question 7: What is 'efflorescence' in masonry walls?
- Delamination of the brick face
- White salt deposits on the surface (Correct answer)
- Freeze-thaw spalling
- Mortar joint erosion
Correct answer: White salt deposits on the surface
Efflorescence occurs when water moves through masonry, dissolves soluble salts, and deposits them as white crystalline stains on the surface upon evaporation.
BCE Construction & Building Materials 4
Which roofing material is classified as a Built-Up Roof (BUR) system?