Building Materials & Systems Flashcards
7 cards from real CCS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Building Materials & Systems flashcards as text
What distinguishes 'Type 316' stainless steel from 'Type 304' in exterior construction applications?
Answer: Type 316 contains molybdenum, providing superior resistance to chloride pitting corrosion in marine environments
The addition of molybdenum in Type 316 stainless steel significantly improves resistance to pitting from chlorides, making it preferred near saltwater.
What is the primary structural advantage of using hollow-core precast concrete planks over solid concrete slabs of the same depth?
Answer: Hollow cores reduce dead load while maintaining structural depth, allowing longer spans
Removing concrete from the tension zone of a plank reduces dead load with minimal impact on structural performance, enabling longer economical spans.
When a specifier calls for 'hot-dip galvanizing' per ASTM A123, what is the primary corrosion protection mechanism?
Answer: The zinc coating sacrificially corrodes to protect underlying steel, and also provides a physical barrier
Hot-dip galvanizing provides both cathodic (sacrificial) protection and a barrier coating; zinc corrodes preferentially to protect the steel.
What does the term 'hygroscopic' mean when applied to building materials?
Answer: The material absorbs and releases moisture from the air in response to changes in relative humidity
Hygroscopic materials like wood, gypsum, and masonry absorb moisture when relative humidity rises and release it when humidity falls.
Which of the following best describes 'intumescent' fire protection materials?
Answer: Materials that expand significantly when heated to form an insulating char that protects the substrate
Intumescent materials swell many times their original volume when exposed to heat, forming a low-conductivity char that insulates steel or seals penetrations.
A specification requires concrete with a water-cementitious materials ratio (w/cm) of 0.40 maximum. What is the primary purpose of this limit?
Answer: To reduce permeability and increase durability by limiting excess mix water that creates capillary pores
Lower w/cm ratios reduce capillary porosity in hardened concrete, improving resistance to chloride penetration, freeze-thaw cycles, and chemical attack.
What is the function of 'weep holes' in a brick veneer wall system?
Answer: To allow water that penetrates behind the veneer to drain out at the base of the cavity
Weep holes at the base of brick veneer allow collected water from the flashing to drain out of the wall cavity before reaching the backup wall.