# Concrete Mix Design (ACI 211) Design a normal-weight concrete mix per ACI 211.1-91 absolute-volume method. Inputs: slump, nominal max aggregate size, air entrainment, water-cement ratio w/c, fineness modulus of sand, and dry-rodded coarse-aggregate density. Outputs the per-cubic-meter masses of cement, water, fine and coarse aggregate plus the mass ratio. > Canonical page: https://elysiatools.com/en/tools/concrete-mix-design - **Category:** Math & Numbers - **Keywords:** concrete mix design, ACI 211, water-cement ratio, fineness modulus, slump, coarse aggregate, air entrainment, civil engineering, construction materials ## Overview This Concrete Mix Design calculator simplifies the process of proportioning normal-weight concrete mixtures using the ACI 211.1-91 absolute-volume method. By inputting key physical properties of your aggregates and design requirements, you can instantly calculate the required masses of cement, water, fine aggregate, and coarse aggregate per cubic meter, along with their corresponding mass ratios. ## Inputs - **Slump (mm)** (select) - **Nominal Max Aggregate Size (mm)** (select) - **Air Entrainment** (select) - **Water-Cement Ratio w/c** (number): Mass ratio of water to cement. Typical range 0.35–0.65. - **Fineness Modulus of Sand** (number): Fineness modulus of the fine aggregate. ACI reference range 2.40–3.00. - **Coarse Aggregate Dry-Rodded Density (kg/m³)** (number): Dry-rodded unit weight of the coarse aggregate. Default 1600 kg/m³. - **Decimal Places** (number) ## When to use - When proportioning trial batches of normal-weight concrete for civil engineering and construction projects according to ACI 211.1-91 standards. - When adjusting mix designs based on changing aggregate properties, such as sand fineness modulus or coarse aggregate dry-rodded density. - When estimating material quantities (cement, water, sand, and gravel) required per cubic meter of concrete for budgeting and procurement. ## How it works - Select the design slump range, nominal maximum aggregate size, and air entrainment status to determine the mixing water requirement and air content. - Enter the target water-cement (w/c) ratio, the fineness modulus of the sand, and the dry-rodded density of the coarse aggregate. - The tool performs lookups based on ACI 211.1-91 tables to determine the volume of coarse aggregate and the net water content. - It applies the absolute-volume method to calculate the remaining volume for fine aggregate, outputting the final batch weights per cubic meter and the mass ratios. ## Use cases - Civil engineers designing trial mixes for structural concrete elements. - Concrete batch plant operators verifying mix proportions against project specifications. - Construction materials students learning the ACI 211.1-91 absolute-volume design procedure. ## Frequently asked questions ### What standard does this concrete mix design calculator follow? It follows the ACI 211.1-91 standard using the absolute-volume method for normal-weight concrete. ### What is the typical range for the water-cement (w/c) ratio? The typical range is between 0.35 and 0.65, depending on the target strength and exposure conditions. ### How is the volume of coarse aggregate determined? It is determined based on the nominal maximum size of the aggregate and the fineness modulus of the sand using standard ACI 211.1 table values. ### Does this tool account for aggregate moisture corrections? No, this tool calculates the mix design based on dry aggregate weights as per standard ACI absolute-volume calculations. ### What is the fineness modulus of sand? 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