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ASTM C685 – Standard Specification for Concrete Made by Volumetric Batching and Continuous Mixing


This specification covers concrete made from materials continuously batched by volume, mixed in a continuous mixer, and delivered to the purchaser in a freshly mixed and unhardened state as hereinafter specified.

Requirements for quality of concrete shall be either as hereinafter specified or as specified by the purchaser. When the requirements of the purchaser differ from this specification, the purchaser’s specification shall govern.

This specification does not cover the placement, consolidation, finishing, curing, or protection of the concrete after delivery to the purchaser.

Tests and criteria for batching accuracy and mixing efficiency are specified herein.


ready-mixed concrete; testing