Concrete Mix Designer (ACI 211.1) — Ebora Construction Materials

🧱 ACI 211.1 · Absolute-Volume Method

Concrete Mix Designer

Proportion normal-weight concrete by ACI 211.1. Enter the design strength, slump, aggregate size and properties — the app finds the mixing water, w/c ratio, cement, and the coarse & fine aggregate per cubic metre, corrects for aggregate moisture, and shows every step.

🆓 Free design tool — proportion as many mixes as you like · Balance … EP

① Strength & consistency

Specified strength f′c (MPa)

Target slump (mm)

I’ll enter my own required average strength f′cr

Required average strength f′cr (MPa)

Leave this off and the app uses the ACI 318 no-record rule: f′cr = f′c + 7.0 (≤21), + 8.3 (21–35), or 1.10 f′c + 5.0 (>35).

② Aggregate & air

Max aggregate size

Fineness modulus of sand

Air-entrained concrete

Exposure (sets target air content)

Non-air-entrained mixes use the table’s entrapped-air value automatically.

③ Aggregate properties

DRUW of coarse agg (kg/m³)

Sp. gravity, coarse (SSD)

Sp. gravity, fine (SSD)

Sp. gravity, cement

Max w/c (durability, opt.)

Trial batch volume (m³, opt.)

DRUW = dry-rodded (compacted) unit weight of the coarse aggregate. SSD = saturated-surface-dry basis. Defaults are used when a specific-gravity field is left blank.

④ Aggregate moisture (optional field correction)

Correct the batch for aggregate moisture

Coarse agg absorption (%)

Coarse agg total moisture (%)

Fine agg absorption (%)

Fine agg total moisture (%)

Free (surface) moisture = total moisture − absorption. Wetter-than-SSD aggregate carries extra water, so the added mixing water is reduced; drier aggregate increases it.

📋 Design mix (per 1 m³)

—

Cement : Fine : Coarse (by mass) · w/c by mass

Cement Water Fine agg Coarse agg Air by absolute volume

Cement

—

Water

—

Fine aggregate

—

Coarse aggregate

—

Water–cement ratio

—

Air content

—

Required avg f′cr

—

Cement (40-kg bags)

—

b/b₀ (coarse agg)

—

Concrete Mix Designer

① Strength & consistency

② Aggregate & air

③ Aggregate properties

④ Aggregate moisture (optional field correction)

📋 Design mix (per 1 m³)

Worked solution

Moisture-corrected batch (wet stock weights)

Trial batch