Core TradesCâu 169 / 700
For typical residential foundations in a moderate weathering region, what is a common MINIMUM specified 28-day compressive strength for the concrete?
a.1,500 psi
b.2,500 psi
c.5,000 psi
d.8,000 psi
Giải thích
Residential foundation concrete is commonly specified at a minimum of 2,500 psi in moderate weathering areas. 1,500 psi is too low for structural foundation use, while 5,000 and 8,000 psi are high-strength mixes used for heavily loaded columns or specialty work, not standard house footings.
Trích dẫn luật: 2025 CA Residential Code, R402.2 (Concrete)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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