ASTM C94/C94M-21b PDF Download

The ASTM C94/C94M-21b standard outlines the requirements and specifications for ready-mixed concrete that is delivered to a purchaser in a freshly mixed and unhardened state. The standard allows for flexibility based on the purchaser's specific requirements, stating that if the purchaser's specifications differ from those in the standard, the purchaser's requirements shall govern.

The standard covers various aspects of ready-mixed concrete production and delivery. It specifies the quality requirements for the concrete, including materials such as cementitious materials, aggregates, and admixtures. The measurement of cement, aggregate, and admixtures should be done by mass, unless otherwise permitted. The standard also defines the types of mixers and agitators that can be used in the production of ready-mixed concrete.

The standard includes test methods for evaluating the properties of the concrete, such as compression strength, air content, slump, and temperature. It requires the production of at least two standard test specimens for strength testing. The placement, consolidation, curing, and protection of the concrete after delivery to the purchaser are not covered under this specification.

The standard contains notes and footnotes that provide additional explanatory information, but these notes and footnotes are not considered as requirements of the specification, with the exception of those included in tables and figures.