ASTM C94/C94M-25 PDF

Full title and description

ASTM C94/C94M-25 — Standard Specification for Ready-Mixed Concrete. Specifies requirements for manufacture and delivery of ready-mixed concrete in a freshly mixed and unhardened state, covering materials, batching, measurement, delivery equipment, and required field and laboratory tests for acceptance and quality control.

Abstract

This specification covers ready-mixed concrete manufactured and delivered to a purchaser in a freshly mixed and unhardened state. It sets quality requirements that are either those in the specification or those ordered by the purchaser, and it references applicable materials specifications. Cement, aggregate, and admixtures are generally measured by mass; mixers, agitators, and required test methods (slump, air content, temperature, compressive strength specimens) are specified. The specification does not address placement, consolidation, curing, or protection after delivery.

General information

• Status: Active (current edition published as ASTM C94/C94M-25).
• Publication date: 2025 (ASTM C94/C94M-25 published January 6, 2025).
• Publisher: ASTM International.
• ICS / categories: 91.100.30 — Concrete and concrete products.
• Edition / version: ASTM C94/C94M-25 (with later amendment/versioning tracked separately by ASTM).
• Number of pages: Approximately 16 pages (published pagination varies by format).

Scope

Specifies requirements for ready-mixed concrete as delivered to the purchaser, including definitions, producer/purchaser responsibilities, materials requirements (cementitious materials, aggregates, admixtures), measurement conventions (mass-based unless permitted otherwise), types of mixers/agitators, and mandatory test methods for acceptance. The specification explicitly excludes procedures for placement, consolidation, curing, and protection after delivery. It also notes where alternative specifications apply (for example, concrete from volumetric batching and continuous mixing or fiber‑reinforced concrete).

Key topics and requirements

• Definitions and roles of producer and purchaser.
• Materials requirements for cementitious materials, aggregates, air-entraining and chemical admixtures; reference to material specification standards.
• Measurement and batching—cement, aggregates, and admixtures measured by mass except where otherwise permitted.
• Mixing and delivery equipment—stationary mixers, truck mixers, truck agitators; requirements for mixers/agitators.
• Quality requirements and purchaser-specified requirements take precedence when they differ from the specification.
• Mandatory field and laboratory test methods for acceptance and quality control: slump, air content (pressure or volumetric), temperature, unit weight/yield, and compressive strength specimen preparation and testing.
• Units: values are stated in both SI and inch‑pound systems and each system is to be used independently.
• Notes and footnotes provide explanatory material but are not requirements of the specification.

Typical use and users

Used by ready-mix producers, quality-control laboratories, construction contractors, structural and materials engineers, architects, project specifiers, and owners to define production and acceptance criteria for ready‑mixed concrete deliveries. Also used by procurement/specification authors and construction inspectors.

Related standards

Frequently referenced standards include ASTM C685/C685M (concrete made by volumetric batching and continuous mixing), ASTM C1116/C1116M (fiber‑reinforced concrete), and numerous test methods and practices such as C31/C31M (making and curing test specimens in the field), C39/C39M (compressive strength of cylinders), C143/C143M (slump), C138/C138M (unit weight, yield, air content), C231/C231M and C173/C173M (air content), and other ASTM and AASHTO methods used for sampling and acceptance. The specification is also commonly cited in ACI project specifications and codes.

Keywords

ready-mixed concrete, ready mix, concrete specification, batching, slump, air content, compressive strength, mixers, truck mixers, admixtures, mass measurement, quality control, C94, C94M.

FAQ

Q: What is this standard?

A: ASTM C94/C94M-25 is the ASTM International Standard Specification for Ready‑Mixed Concrete that sets minimum production and delivery requirements and references required test methods for acceptance.

Q: What does it cover?

A: It covers the manufacture and delivery of ready‑mixed concrete in a freshly mixed and unhardened state, including material requirements, batching and measurement, mixer/agitator classifications, and required testing (slump, air content, temperature, compressive strength specimen preparation, unit weight/yield). It does not cover placement, consolidation, curing, or protection after delivery.

Q: Who typically uses it?

A: Ready‑mix producers, construction contractors, materials engineers, testing laboratories, project specifiers, and construction inspectors use this standard to define production and acceptance criteria for concrete deliveries.

Q: Is it current or superseded?

A: The C94/C94M-25 edition is the 2025 edition of the standard (published January 6, 2025). Users should check for any subsequent amendments or revisions (ASTM maintains amendment/version tracking; for example, a later amendment/version C94/C94M-25a is shown in ASTM records). If you need the absolutely latest status or errata, consult ASTM's records or your standards librarian for current amendment history.

Q: Is it part of a series?

A: Yes. C94/C94M is part of the family of ASTM cement and concrete standards and is commonly paired with companion specifications and test methods (for example, C685 for volumetric batching, C1116 for fiber‑reinforced concrete, and many C‑series test methods used for sampling and testing). It is also frequently referenced in ACI and AASHTO documents and industry specifications.

Q: What are the key keywords?

A: Ready‑mixed concrete, batching, slump, air content, compressive strength, mixers, admixtures, mass measurement, quality control (C94, C94M).