ASTM C94 Calculator | Ready-Mixed Concrete Specifications 2026 — MixDesignCalc

🇺🇸 ASTM C94/C94M-21 · ASTM C1064 · ACI 305R · 2026

ASTM C94 Ready-Mixed Concrete Calculator

Complete ASTM C94 compliance tools for ready-mixed concrete — batch ticket verification, drum revolution limits, discharge time, slump at delivery, water addition checks, yield calculation and concrete temperature compliance

📋 Batch Ticket Verification 🔄 Drum Revolution Counter ⏳ Discharge Time Check 🌮️ Slump at Delivery 💯 Yield Calculator 🌡️ Temperature Compliance

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Batch Ticket Verification

ASTM C94 Cl. 11 — Verify all mandatory batch ticket fields and check ingredient quantities against the design mix

Design Mix Quantities (per m³ or per yd³)

Units System

Batch Volume (m³ or yd³)

Design Cement (per unit volume)

Design Water (per unit volume)

Design Fine Agg (per unit volume)

Design Coarse Agg (per unit volume)

Design w/c Ratio

Design Slump (mm or in)

Slump Tolerance (±mm or ±in)

Actual Batch Ticket Quantities

Actual Cement Batched (total for batch)

Total batch quantity (design × volume)

Actual Water Batched (total)

Actual Fine Agg (total)

Actual Coarse Agg (total)

Water Added at Site (total)

ASTM C94 Cl. 10.4: site water must be recorded

Slump at Delivery (mm or in)

Concrete Temp at Delivery (°C or °F)

Ticket w/c Ratio (batched)

📋 Batch Ticket Verification Report

ASTM C94 Cl. 11 — Mandatory Batch Ticket Information: Every load of RMC must carry a delivery ticket including: plant name and batch number, date and time of batching, truck number, mix design ID, amount of concrete, aggregate quantities (SSD basis), cement content, water added at plant, admixture quantities, w/c ratio, design compressive strength, and design slump. ASTM C94 Cl. 11.8: signature of authorized representative.

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Drum Revolution Counter & Mixing Compliance

ASTM C94 Cl. 9 — Drum revolution limits for transit-mixed concrete: 70–100 revolutions at mixing speed; max 300 total before discharge

Mixing Revolutions (at mixing speed)

ASTM C94 Cl. 9.3.3: 70–100 rev. at mixing speed required

Agitating Revolutions (at agitating speed)

Typically 2–6 RPM agitating speed during transit

Mixing Speed (RPM)

Agitating Speed (RPM)

Total Drum Revolutions (all modes combined)

ASTM C94 Cl. 9.3.1: max 300 total before discharge

Transit Duration (minutes)

🔄 Drum Revolution Compliance

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total rev.

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Mixing Revs

—

req. 70–100

Agitating Revs

—

at agit. speed

Total Revolutions

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max 300

Mixing Speed

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RPM

Mixing Rev. Status

—

Total Rev. Status

—

        📌 ASTM C94 Cl. 9 — Drum Revolution Requirements
        Minimum mixing revolutions: 70 at mixing speed (Cl. 9.3.3)
Maximum mixing revolutions: 100 at mixing speed before discharge (Cl. 9.3.3)
Absolute maximum total revolutions: 300 (any speed) before discharge — this limit exists to prevent over-working and degradation of concrete (Cl. 9.3.1)
Speed definitions (Cl. 9.1): Mixing speed ≥ 6 RPM (manufacturer's rated speed); agitating speed 2–6 RPM for transport
Counter certification: Revolution counter must be calibrated per ASTM C94 Annex A requirements

    

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Discharge Time Compliance

ASTM C94 Cl. 11.8 — Discharge must be completed within 90 minutes OR 300 drum revolutions of water contact, whichever comes first

Time Water First Added (HH:MM)

First water contact — batching plant

Time Discharge Completed (HH:MM)

Total Drum Revolutions (at discharge)

Concrete Temperature (°C)

ACI 305R: high temperature shortens working life; consider reducing limit to 60 min if T > 32°C

Admixture Type

Project Specification Time (min, 0 = use ASTM C94)

Override with project spec limit if more restrictive

⏳ Discharge Time Compliance

Elapsed Time

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minutes

Time Limit (ASTM C94)

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minutes

Time Remaining

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minutes

Revolution Check

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max 300

Overall Status

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Governing Limit

—

ASTM C94 Cl. 11.8 — Discharge Time Rule: Concrete must be discharged before either (a) 90 minutes or (b) 300 drum revolutions — whichever limit is reached first. In hot weather or with accelerating admixtures, the project specification may impose a more restrictive time limit. Under no circumstances shall concrete be used after 300 drum revolutions regardless of elapsed time.

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Water Addition at Site — ASTM C94 Cl. 10.4

Calculate maximum permissible water addition at site to reach design slump without exceeding design w/c ratio

Design w/c Ratio

Design Water Content (L/m³)

Cement Content (kg/m³)

Water in Drum at Delivery (L/m³ equivalent)

Actual water batched ÷ batch volume; from ticket

Batch Volume (m³)

Slump at Delivery (mm)

Required Slump at Pour (mm)

💧 Water Addition Assessment

Water Deficit per m³

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L/m³

Max Permissible Add (per m³)

—

L/m³ (w/c limit)

Max Water to Add (total batch)

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litres

Resulting w/c (after add)

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Slump Gain Estimate

—

mm approx

Required Drum Revs After Add

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min 30 rev.

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⚠️ ASTM C94 Cl. 10.4 — Site Water Addition Rules: (1) Water addition is ONLY permitted before discharge begins. (2) The quantity added must NOT cause the w/c ratio to exceed the design maximum. (3) After water addition, the drum must be turned a minimum of 30 revolutions at mixing speed before discharge. (4) All site water additions must be recorded on the delivery ticket. (5) The inspector or engineer must authorize site water addition — it is NOT a batching plant decision.

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Concrete Yield Calculator

ASTM C138/C94 — Calculate actual yield from batch quantities and densities; verify air content and check yield tolerance (±1%)

Cement Batched (kg total)

Water Batched (L total)

Fine Aggregate (kg total)

Coarse Aggregate (kg total)

Admixture (kg total, 0 if none)

Measured Fresh Density (kg/m³) — ASTM C138

Design Batch Volume (m³)

Air Content (% — ASTM C231)

💯 Concrete Yield Results

Total Batch Mass

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Actual Yield

—

m³

Design Volume

—

m³

Yield Difference

—

m³

Yield Ratio

—

actual/design

Air Content Check

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Effective Cement Factor

—

kg/m³ actual

ASTM C94 Tolerance

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±1% of design vol.

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ASTM C94 Yield Tolerance (Cl. 14): The actual yield shall not be less than 98% or more than 102% of the design batch volume. Yield below 98% means the customer is receiving less concrete than ordered and paid for — a commercial as well as quality issue. Yield above 102% indicates under-batching of cementitious content per unit volume, potentially reducing strength and durability.

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Concrete Temperature Compliance

ASTM C1064 · ACI 305R (hot weather) · ACI 306R (cold weather) — Fresh concrete temperature limits at point of delivery

Measured Concrete Temp (°C)

Ambient Air Temp (°C)

Cement Content (kg/m³)

Element Type

Water Temp Adjustment

Project Specification

Custom Max Temp (°C, if selected above)

🌡️ Temperature Compliance Results

Concrete Temperature

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°C (measured)

Applicable Limit

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°C (specification)

Compliance Status

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Temp Margin

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°C

Water Cooling Option

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temp reduction est.

Season Classification

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Standard / Code	Max Temp at Delivery	Min Temp (Cold Weather)	Applicable Region/Use
ASTM C94-21	35°C (95°F)	—	USA — General RMC specification
ACI 305R-20 (Hot)	32°C (90°F)	—	USA — Hot weather concrete production
ACI 306R-16 (Cold)	—	10°C (50°F) at placing	USA — Cold weather protection
IS 456:2000 Cl. 13.7	40°C at placing	—	India — All reinforced concrete
EN 206-1 (Europe)	30°C (fresh, Type S5)	5°C minimum	Europe — Structural concrete
IS 4926:2003 (RMC)	38°C at discharge	—	India — Ready-mixed concrete

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ASTM C94 Key Clauses Reference

ASTM C94/C94M-21 — Standard Specification for Ready-Mixed Concrete · Most-referenced clauses for site engineers

Clause	Requirement	Limit / Value	Applies To
Cl. 9.1	Mixing speed	≥ 6 RPM (manufacturer rated)	Transit-mixed concrete
Cl. 9.3.1	Maximum total drum revolutions	300 revolutions (any speed)	All transit-mixed loads
Cl. 9.3.3	Mixing revolutions required	70–100 at mixing speed	Transit-mixed at truck
Cl. 10.4	Water addition at site	Permitted if w/c ≤ design; 30 rev. after; documented	All deliveries
Cl. 11.8	Discharge time limit	90 minutes OR 300 revolutions (whichever first)	All transit-mixed loads
Cl. 11.8.2	Hot weather / retarder exception	Time may be extended by contract specification	Hot weather or retarded mixes
Cl. 14	Yield tolerance	±1% of design volume	All deliveries
Cl. 16	Slump tolerance at delivery	±25 mm (±1 in) typical; per specification	At point of delivery
Cl. 18	Temperature	≤ 35°C at delivery (ASTM C1064)	All deliveries
Annex A	Revolution counter calibration	Annual or per manufacturer spec	Transit mixer trucks

ASTM C94 Ready-Mixed Concrete Calculator

📋Batch Ticket Verification

Design Mix Quantities (per m³ or per yd³)

Actual Batch Ticket Quantities

📋 Batch Ticket Verification Report

🔄Drum Revolution Counter & Mixing Compliance

🔄 Drum Revolution Compliance

📌 ASTM C94 Cl. 9 — Drum Revolution Requirements

⏳Discharge Time Compliance

⏳ Discharge Time Compliance

💧Water Addition at Site — ASTM C94 Cl. 10.4

💧 Water Addition Assessment

💯Concrete Yield Calculator

💯 Concrete Yield Results

🌡️Concrete Temperature Compliance

🌡️ Temperature Compliance Results

📄ASTM C94 Key Clauses Reference

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Batch Ticket Verification

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Drum Revolution Counter & Mixing Compliance

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Discharge Time Compliance

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Water Addition at Site — ASTM C94 Cl. 10.4

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Concrete Yield Calculator

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Concrete Temperature Compliance

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ASTM C94 Key Clauses Reference