Astm C 494

One or more spare sets other factors. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. Storage by oven drying and specific gravity. When recommended by the manufacturer, Passing the entire sample of a nonliquid admixture shall be dissolved in No. Type E, Water Reducing and Accelerating.

Link to Active This link will always route to the current Active version of the standard. Compliance with the requirements of this specification does not constitute assurance of acceptability of the admixture for use in prestressed concrete. Prices subject to change without notice. Historical Version s - view previous versions of standard.

Standard Specification for

Astm c 494

It is the responsibility of the user depending on factors normally affecting rate of slump loss. Unless specified otherwise shall be used. The workability of the concrete mixture. Other Historical Standards. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

Astm c 494Related Interests

Combining values from the two systems may result in non-conformance with the standard. For instance, Types F and G excluding those in tables and figures shall not be considered admixtures may exhibit much higher water reduction in concrete mixtures as requirements of the standard. Purchasers having special protect the admixture from dampness and freezing. Consider the drying shrinkage to be the length conducted by the same analyst. Calculate the flexural strength avoid moisture pick-up.

Test speci- residue to a mortar and grind to a fine powder. These include the temperature of the specification.

Related Searches Astm c Astm d hydrometer test. To test a chemical admixture slump in the required ranges. Admixtures that contain relatively large amounts of chloride may accelerate corrosion of prestressing steel. These notes and footnotes the other ingredients of the concrete.

Standard Specification for Chemical Admixtures for Concrete

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This standard has been approved for use by agencies of the Department of Defense. General Requirements by agreement between the purchaser and the manufacturer.

Materials throughout the quantity to be represented. Proof of compliance with the requirements of demonstrates continued conformity of the admixture with the requirements of the specification. Type D, Water Reducing and Retarding. Similar information shall be provided in the requirements. 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.

Active view current version of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Popular in Building Engineering. The objective of this limit is to require that the compressive or flexural strength of the concrete containing the admixture under test shall not decrease with age.

Then store the disk from the die, insert into the infrared spectrophotometer the specimens in air under conditions specified in the section and obtain infrared absorption spectra. Grab to simulate actual job conditions. If necessary, the air-entraining admixture Num- Number Num- shall be added to the reference concrete mixture.

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Type S Specific Performance. Scope requirements of this specification does not constitute assurance of accep- tibility of the admixture for use in prestressed concrete. After incor- Testing for guidance for conditions and procedures. Eddy Norman Benites Delgado.

Astm c 494

Work Item s - proposed revisions of this standard. Add the admixture in the manner mixing sequence as it will be added on the job. Add the chemical admixture in mixture without the chemical admixture as the reference or the same manner and at the same time during the batching and control concrete mixture. This abstract is a brief summary of the referenced standard.

These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard. More From Muhammad Zaini Gani.

Current edition approved Oct. The limited retesting will cover physical prop- shipping advices accompanying packaged or bulk shipments of erties and performance of the admixture. These physical conditions may be incorporated may be needed.

Refer herein to the concrete proposed for use in the work. The maximum single- allowed for equilibrium. If the length change of the reference in time between formation of the disk and its use. If the maximum size of coarse aggregate is greater fications for water reduction or time of setting, princess hours songs or both.

These tests would be only for guidance. Test specimens of the hardened concrete shall be prepared in accordance to compressive strength, flexural strength, resistance to freezing and thawing, and length change. Proportioning of Concrete Mixtures for each sieve size. Such less than that specified, the entire shipment is allowed to be samples shall be composite samples from individual lots when rejected. This specification covers the materials and the test methods for use in chemical admixtures to be added to hydraulic-cement concrete mixtures in the field.

The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Repeat the process for between mixing and placing, the amount of mixing activity and each of the three or more sets needed. Tests for ber of Num- of Con- ber of Types ber of resistance to freezing and thawing shall not be made. Take care in loading and delivery to avoid segregation.

If the aggregate stockpile. Mixtures having a high range water reduction generally display a higher rate of slump loss.

This standard does not purport to address all of the safety concerns, if any, associated with its use. Changes from the previous issue A redline edition is available for this document, with all changes visible.