Core TradesCâu 14 / 700
Final troweling or hard floating of a concrete slab should NOT begin until:
a.The concrete has fully cured for 28 days
b.Rebar is placed at the bottom of the slab
c.A curing compound has been sprayed on
d.Surface bleed water has evaporated
Giải thích
Finishing must wait until bleed water has left the surface; working the water back in traps it under the finished layer and produces scaling and a weak surface. The other choices confuse curing timing, reinforcement placement, and curing-compound steps with the finishing window.
Trích dẫn luật: 2025 CA Building Code (CBC) Chapter 19 (Concrete)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Six cylindrical concrete piers are each 18 inches in diameter and 4 feet deep. Approximately how many cubic yards of concrete are needed for all six?
- A rectangular slab measures 20 feet by 25 feet and is 5 inches thick. Approximately how many cubic yards of concrete does it require?
- Mechanical vibration of freshly placed concrete is done PRIMARILY to:
- For general-use receptacles along a dwelling wall, the spacing rule requires that no point measured horizontally along the wall line be more than what distance from a receptacle?
- Along a kitchen countertop, receptacle outlets must be placed so that no point along the counter wall line is more than what distance from a receptacle?
- What is the MINIMUM headroom (vertical clearance) required for the working space about a service panel or other electrical equipment rated 600 volts or less?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB General Building (B) Trade Examination · Quy trình kiểm tra