Structural Concrete Mix Calculator for Posts, Beams & Columns
Determine concrete volume and material batching for structural columns, lintels, and beams: high-strength cement bag counts, aggregate grading, and rebar coverage.
Eurocode 2 & Norme NF DTU 21 (Béton armé structurel)
Classe de résistance structurelle C25/30
Ciment CPJ 45 / CPA 55
Dosage cible : 350 kg/m³ de béton
E/C ≈ 0,50 (175 L / m³)
Maniabilité optimale sans perte de résistance
1. Structure Shape & Dimensions
2. Concrete Type & Target Mix Ratio
3. Packaging & Waste Allowance
Allow 5% to 10% to accommodate uneven ground excavations and mixer residue.
Required Materials Summary
Visual Shape Blueprint
Tableau de référence des proportions pour 1 m³ de béton
| Composant | Quantité pour 1 m³ | Équivalence Sacs / Brouettes | Rôle technique |
|---|---|---|---|
| Ciment (CPJ 35 / CPJ 45) | 350 kg | 7 sacs de 50 kg ou 10 sacs de 35 kg | Liant hydraulique et résistance mécanique |
| Sable propre à maçonner (0/4) | 800 à 850 kg | ~14 à 15 brouettes de 60 L | Remplissage des vides et compacité |
| Gravillons concassés (4/10 ou 10/20) | 1 100 à 1 200 kg | ~18 à 20 brouettes de 60 L | Squelette granulaire portant |
| Eau propre de gâchage | 160 à 175 litres | ~16 à 17 arrosoirs de 10 L | Hydratation du ciment |
Autres ouvrages fréquents en béton
Questions Fréquentes sur le Dosage Béton
What cement type should be used for poteaux poutres?
We recommend using Ciment CPJ 45 / CPA 55 dosed at 350 kg/m³, conforming to Eurocode 2 & Norme NF DTU 21 (Béton armé structurel). This provides optimal compressive strength and long-term durability.
How many 35kg or 50kg bags are needed for 1 m³ of concrete?
For a standard 350 kg/m³ mix: exactly 10 bags of 35 kg or 7 bags of 50 kg per cubic meter of finished concrete (plus ~5% safety margin for wastage).
Structural Concrete Mix Calculator for Posts, Beams & Columns
Standardized compressive strength classes, Eurocode 2 and building code compliance
Our concrete mix calculator integrates technical specifications from global cement manufacturers including LafargeHolcim, Heidelberg Materials (Ciments du Maroc), and Vicat. It supports European EN 197-1 cement classifications (CEM I 42.5 R, CEM II/B-LL 32.5 R), Moroccan NM 10.1.004 standards (CPJ 35, CPJ 45), and US ASTM Type I/II Portland cements. Formulations align with Eurocode 2 structural guidelines and execution standards for reinforced footings, ground-bearing floor slabs, grade beams, and columns.
Strength classes (C20/25, C25/30), volume ratio rule and bagged packaging conversions
Direct computation across standard concrete grades: C12/15 for blinding concrete (150-200 kg/m³), C20/25 for patios and walkways, and C25/30 (approx. 3500-4000 PSI) for load-bearing slabs and structural columns. It calculates the benchmark 350 kg/m³ mix ratio (7 bags of 50 kg or 10 bags of 35 kg per cubic meter) alongside the practical volumetric 1-2-3 rule (1 part cement, 2 parts sharp sand, 3 parts coarse aggregate, 0.5 part water), with instant wheelbarrow batching approximations (~14 to 16 full 60L wheelbarrows per m³).