ASTM C685/C685M-25 PDF
Name in English:
St ASTM C685/C685M-25
Name in Russian:
Ст ASTM C685/C685M-25
Original standard ASTM C685/C685M-25 in PDF full version. Additional info + preview on request
Full title and description
ASTM C685/C685M-25 — Standard Specification for Concrete Made by Volumetric Batching and Continuous Mixing. This specification defines requirements, tests, and acceptance criteria for concrete produced by continuous volumetric batching and continuous mixing and delivered in a fresh, unhardened state to the purchaser.
Abstract
The standard covers materials, batching accuracy, mixing efficiency, and required test methods (including compression specimens and tests, yield, unit weight, air content, slump, and temperature). It does not cover placement, consolidation, finishing, curing, or protection of concrete after delivery to the purchaser; purchaser requirements may supplement or override the specification where noted.
General information
- Status: Current / Active.
- Publication date: July 1, 2025.
- Publisher: ASTM International (American Society for Testing and Materials).
- ICS / categories: 91.100.30 (Concrete and concrete products).
- Edition / version: C685/C685M-25.
- Number of pages: 11.
Scope
This specification applies to concrete made from materials continuously batched by volume and mixed in a continuous mixer, delivered in a fresh and unhardened condition. It establishes criteria and test methods for batching accuracy and mixing uniformity but explicitly excludes procedures for placing, consolidating, finishing, curing, or protecting concrete after delivery; purchaser-specified requirements take precedence where they differ.
Key topics and requirements
- Definition and requirements for volumetric batching and continuous mixing processes.
- Batching accuracy and mixing-efficiency tests and acceptance criteria.
- Material requirements for cement, aggregates, water, slag, air-entraining and chemical admixtures (referenced to applicable material standards).
- Prescribed test methods: preparation of compression test specimens and compression testing, yield/unit-weight measurement, air-content determination, slump, and temperature measurement.
- Separate SI and inch-pound unit tables and the requirement that unit systems be used independently (do not combine values from the two systems).
- Notes and annexes providing guidance on significance, use, and application of test procedures (informative material not mandatory).
Typical use and users
Used by ready-mixed and on-site concrete producers operating volumetric batching or continuous-mix equipment, quality-control and laboratory personnel, construction contractors and specifiers, project owners, and testing laboratories responsible for acceptance testing and verification of batching/mixing performance.
Related standards
Commonly used alongside other ASTM concrete standards and test methods such as ASTM C94 (Ready-Mixed Concrete), ASTM C31 (Making and Curing Concrete Test Specimens in the Field), ASTM C143 (Slump of Hydraulic-Cement Concrete), ASTM C231 (Air Content), and ASTM C138 (Unit Weight). The 2025 edition supersedes the previous C685/C685M-24 edition.
Keywords
volumetric batching, continuous mixing, ready-mixed concrete, batching accuracy, mixing efficiency, slump, air content, unit weight, compression test, ASTM C685, concrete testing.
FAQ
Q: What is this standard?
A: ASTM C685/C685M-25 is the ASTM International specification that defines requirements and test methods for concrete produced by volumetric batching and continuous mixing and delivered in a fresh state.
Q: What does it cover?
A: It covers materials and procedures related to volumetric batching and continuous mixing, specifies tests for batching accuracy and mixing uniformity (compression specimens/tests, yield, unit weight, air content, slump, temperature), and sets acceptance criteria; it does not govern placement or curing after delivery.
Q: Who typically uses it?
A: Ready-mix producers using volumetric/continuous mixers, QC/QA laboratory staff, contractors and specifiers writing procurement documents, testing laboratories, and owners requiring quality assurance for continuously mixed concrete.
Q: Is it current or superseded?
A: The C685/C685M-25 edition is current (active) and supersedes the prior C685/C685M-24 edition.
Q: Is it part of a series?
A: Yes — it is part of the suite of ASTM standards addressing concrete materials and testing (see related standards such as C94, C31, C143, etc.).
Q: What are the key keywords?
A: Volumetric batching, continuous mixing, ready-mixed concrete, batching accuracy, mixing efficiency, slump, air content, unit weight, compression tests.