ETC Construction Methods & Equipment Flashcards
6 cards from real ETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ETC Construction Methods & Equipment flashcards as text
What does R-value measure in building insulation?
Answer: Thermal resistance, or how well the material resists heat flow
R-value quantifies an insulation material's resistance to conductive heat flow; higher R-values indicate better insulating performance.
What is the purpose of dewatering on a construction site?
Answer: To remove groundwater from an excavation to maintain dry working conditions
Dewatering involves pumping or draining groundwater from an excavation so workers can safely place foundations and utilities in dry conditions.
What is a submittal in the context of construction administration?
Answer: A document or sample submitted by the contractor for engineer review and approval
A submittal is shop drawings, product data, or material samples submitted by the contractor for the engineer's review to confirm conformance with design intent.
What compaction percentage of maximum dry density is typically specified for structural fill under building foundations?
Answer: 95%
Structural fill under building foundations is commonly specified at 95% of maximum dry density (standard Proctor) to achieve adequate bearing capacity.
What does the term retaining wall describe in civil engineering?
Answer: A structure that holds back soil to maintain a difference in ground elevation
A retaining wall resists lateral earth pressure to maintain a vertical or near-vertical grade change that would otherwise be unstable.
What is the purpose of a vapor barrier installed beneath a concrete slab on grade?
Answer: To prevent moisture from migrating through the ground into the slab and building
A vapor barrier (typically 10-mil polyethylene sheeting) blocks ground moisture from wicking upward through concrete, protecting flooring materials and indoor air quality.