ASTM C685 / C685M - 11 Standard Specification For Concrete Made ...

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ASTM C685 / C685M - 11 Standard Specification for Concrete Made by Volumetric Batching and Continuous MixingSHAREFeb. 1, 2012Courtesy ofASTM International

This specification covers concrete made by volumetric batching and continuous mixing. 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. Materials such as cement, aggregates, water, ground granulated blast-furnace slag, air-entraining admixtures, and chemical admixtures shall conform to the requirements covered in this specification. The material shall be subjected to the following test methods: compression test specimens; compression tests; yield; unit weight; air content; slump; and temperature. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Significance and Use A1.2.1 These tests and requirements are used to evaluate loading and operating procedures; verify the accuracy of proportioning and indicating systems; and determine if mixing uniformity has been degraded by excessive wear or by accumulations of hardened concrete, or both (Note A1.1). Note A1.1—The method of loading the batching-mixing unit, proper maintenance, and other factors may have an effect on the ability of the unit to produce uniformly mixed concrete. For this reason, the use of this test method not only measures the efficiency of the mixer, but also the combined effect of the method of loading and operating the unit. A1.2.2 This annex provides additional procedures and cautions that are necessary in the application of existing test methods and practices when used to determine the uniformity of freshly mixed concrete. 1. Scope 1.1 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. 1.2 The values stated in either SI units, shown in brackets, or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3 This specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this specification. 1.4 This standard does not purport to address all the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (WarningFresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged use. ) 2. Referenced Documents (purchase separately) ASTM Standards C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field C33 Specification for Concrete Aggregates C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens C94/C94M Specification for Ready-Mixed Concrete C125 Terminology Relating to Concrete and Concrete Aggregates C127 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate C136 Test Method for Sieve Analysis of Fine and Coarse Aggregates C138/C138M Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete C143/C143M Test Method for Slump of Hydraulic-Cement Concrete C150 Specification for Portland Cement C173/C173M Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method C231 Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method C260 Specification for Air-Entraining Admixtures for Concrete C330 Specification for Lightweight Aggregates for Structural Concrete C494/C494M Specification for Chemical Admixtures for Concrete C567 Test Method for Determining Density of Structural Lightweight Concrete C595 Specification for Blended Hydraulic Cements C637 Specification for Aggregates for Radiation-Shielding Concrete C989 Specification for Slag Cement for Use in Concrete and Mortars C1017/C1017M Specification for Chemical Admixtures for Use in Producing Flowing Concrete C1064/C1064M Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete C1077 Practice for Laboratories Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Laboratory Evaluation C1157 Performance Specification for Hydraulic Cement C1602/C1602M Specification for Mixing Water Used in the Production of Hydraulic Cement Concrete ACI Documents 318 Building Code Requirements for Structural Concrete and Commentary Other Documents VMMB100-01 Volumetric Mixer Standards of the Volumetric Mixer Manufacturers Bureau Index Terms ready-mixed concrete; testing; Concrete construction materials/applications--specifications; Continuous mixing operations; Ready-mixed concrete--specifications; Volumetric measurement--cement/concrete ICS Code ICS Number Code 91.100.30 (Concrete and concrete products) DOI: 10.1520/C0685_C0685M-11 ASTM International is a member of CrossRef.