ASTM C1798/C1798M-24 PDF

Full title and description

ASTM C1798/C1798M‑24 — Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready‑Mixed Concrete. This specification establishes requirements and purchaser‑option provisions for the controlled reuse of returned fresh (plastic) concrete in new ready‑mixed batches, and clarifies limits, measurement units, and purchaser responsibilities.

Abstract

A short specification that defines when and how returned fresh concrete may be incorporated into a new ready‑mixed concrete batch. The document assigns precedence to purchaser requirements, excludes very small quantities from the scope, separates SI and inch‑pound units as independently normative, and states that the specification alone does not by itself grant permission to reuse returned concrete (permission is typically addressed in purchase documents).

General information

• Status: Active.
• Publication date: June 1, 2024.
• Publisher: ASTM International.
• ICS / categories: 91.100.30 — Concrete and concrete products.
• Edition / version: ASTM C1798/C1798M‑24 (revises ASTM C1798/C1798M‑19).
• Number of pages: 3 pages.

Scope

This specification covers returned fresh concrete intended for incorporation into a new batch of ready‑mixed concrete. It defines applicability thresholds (returned concrete quantities less than 450 kg [1000 lb] or 0.2 m3 [0.25 yd3] are not subject to the specification), states that purchaser requirements take precedence where they differ from the standard, and clarifies that the specification by itself does not grant permission to a producer to use returned fresh concrete — permission should be addressed in purchase documents. The specification does not address subsequent placement, consolidation, curing, or protection after delivery.

Key topics and requirements

• Definition and permitted use of returned fresh (plastic) concrete in new ready‑mixed batches.
• Minimum quantity threshold below which the standard does not apply (less than 450 kg / 0.2 m3).
• Priority of purchaser‑specified requirements over the standard when differences exist (purchase documents typically govern permission and limits).
• Separate treatment of SI and inch‑pound units — each system is to be used independently.
• Notes and footnotes are explanatory only and are not mandatory requirements.

Typical use and users

Used by ready‑mix concrete producers, quality managers, technical/specification writers, contracting authorities, and procurement agents who must set or understand allowed practices for recycling returned fresh concrete. Also used by compliance personnel and project engineers to align purchaser requirements, production controls, and testing/acceptance criteria.

Related standards

This edition (‑24) revises ASTM C1798/C1798M‑19. The specification is commonly used alongside other ASTM standards governing ready‑mixed concrete and fresh concrete testing and handling — for example, ASTM C94/C94M (Specification for Ready‑Mixed Concrete) and testing/sampling standards such as ASTM C31/C31M (Field Sampling) and ASTM C143/C143M (Slump), which address complementary aspects of production, sampling, and fresh‑concrete properties. Users should consult the reference list in the standard for the authoritative set of cross‑references.

Keywords

returned fresh concrete; ready‑mixed concrete; reuse; purchaser requirements; specification; concrete production; quantity threshold; SI/inch‑pound units.

FAQ

Q: What is this standard?

A: ASTM C1798/C1798M‑24 is a short ASTM specification that sets requirements and purchaser‑option provisions for the use of returned fresh (plastic) concrete in a new batch of ready‑mixed concrete.

Q: What does it cover?

A: It covers the conditions under which returned fresh concrete may be reused, the applicability threshold (quantities less than 450 kg / 0.2 m3 are excluded), the relationship between purchaser requirements and the standard, and unit conventions; it does not itself grant permission to reuse returned concrete nor does it cover placement, consolidation, curing, or protection after delivery.

Q: Who typically uses it?

A: Ready‑mix producers, plant quality/control personnel, project engineers, specifiers and procurement authorities, and contractors who need to define or comply with rules for returned fresh concrete handling and reuse.

Q: Is it current or superseded?

A: Current — the active edition is ASTM C1798/C1798M‑24 (published June 1, 2024), which revises the prior 2019 edition.

Q: Is it part of a series?

A: It is a standalone specification within the ASTM C09 committee work on concrete and concrete aggregates (Subcommittee C09.40 for ready‑mixed concrete); it is commonly used in conjunction with other ASTM concrete standards (for example ASTM C94/C94M and related fresh‑concrete test and sampling standards).

Q: What are the key keywords?

A: Returned fresh concrete, ready‑mixed concrete, reuse, purchaser requirements, quantity threshold, SI and inch‑pound units.