🇺🇸 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
📋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)
Actual Batch Ticket Quantities
Total batch quantity (design × volume)
ASTM C94 Cl. 10.4: site water must be recorded
📋 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.
🔄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
ASTM C94 Cl. 9.3.3: 70–100 rev. at mixing speed required
Typically 2–6 RPM agitating speed during transit
ASTM C94 Cl. 9.3.1: max 300 total before discharge
🔄 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—max 300
Mixing Speed—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
⏳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
First water contact — batching plant
ACI 305R: high temperature shortens working life; consider reducing limit to 60 min if T > 32°C
Override with project spec limit if more restrictive
⏳ Discharge Time Compliance
Elapsed Time—minutes
Time Limit (ASTM C94)—minutes
Time Remaining—minutes
Revolution Check—max 300
Overall Status—
Governing Limit—
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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.
💧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
Actual water batched ÷ batch volume; from ticket
💧 Water Addition Assessment
Water Deficit per m³—L/m³
Max Permissible Add (per m³)—L/m³ (w/c limit)
Max Water to Add (total batch)—litres
Resulting w/c (after add)—
Slump Gain Estimate—mm approx
Required Drum Revs After Add—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.
💯Concrete Yield Calculator
ASTM C138/C94 — Calculate actual yield from batch quantities and densities; verify air content and check yield tolerance (±1%)
💯 Concrete Yield Results
Total Batch Mass—kg
Actual Yield—m³
Design Volume—m³
Yield Difference—m³
Yield Ratio—actual/design
Air Content Check—
Effective Cement Factor—kg/m³ actual
ASTM C94 Tolerance—±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.
🌡️Concrete Temperature Compliance
ASTM C1064 · ACI 305R (hot weather) · ACI 306R (cold weather) — Fresh concrete temperature limits at point of delivery
🌡️ Temperature Compliance Results
Concrete Temperature—°C (measured)
Applicable Limit—°C (specification)
Compliance Status—
Temp Margin—°C
Water Cooling Option—temp reduction est.
Season Classification—
| 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 |
📄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 |