柱のコンクリート計算機 — 必要な量は？

柱のコンクリートガイド

Concrete columns for structural support typically require 3,500–5,000 PSI concrete with vertical rebar and ties. Decorative columns are often 4,000 PSI. Diameter varies by load — minimum 12 inches for residential. Cure for 28 days before full loading. A 12-in diameter × 8-ft tall column needs about 0.28 cubic yards.