ASTM A820 PDF

More A Scope 1. Five types of steel fibers for this purpose are defined as pieces of smooth or deformed cold-drawn wire; smooth or deformed cut sheet; melt-extracted fibers; mill-cut or modified cold-drawn wire steel fibers that are sufficiently small to be dispersed at random in a concrete mixture. In the case of a conflict between a requirement of the product specification or a requirement of this specification and a more stringent requirement of the purchase order, the purchase order shall prevail.

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A number in parentheses indicates the year of last reapproval. Fivetypes of steel fibers for this purpose are defined as pieces ofsmooth or deformed cold-drawn wire; smooth or deformed cutsheet; melt-extracted fibers; mill-cut or modified cold-drawnwire steel fibers that are sufficiently small to be dispersed atrandom in a concrete mixture.

In the case of a conflictbetween a requirement of the product specification or arequirement of this specification and a more stringent require-ment of the purchase order, the purchase order shall prevail.

The purchase order requirements shall not take precedence ifthey, in any way, violate the requirements of the productspecification or this specification; for example, by the waivingof a test requirement or by making a test requirement lessstringent.

The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other.

Combiningvalues from the two systems may result in non-conformancewith the standard. Referenced Documents2. Federal Standards:4Fed. See 8. Current edition approved Oct. Published October Originallyapproved in DOI: Ordering Information5. Such requirements to be considered include, butare not limited to, the following Materials and Manufacture6.

Mechanical Properties7. This is an approximate distribution ofone fiber tensile test per every 0. The average tensile strength, fu, of each fiber shall notbe less than 50 psi [ MPa]. The tensile strength of anyone of the ten specimens shall not be less than 45 psi[ MPa]. Where the parent source material consists of sheetor wire, tensile tests by the manufacturer may be performed onlarger samples of source material.

One sample of each differentsource material used shall then be tested for each 5 tons[4 kg] of material. The tensile strength of a single sampleof source material shall not be less than 50 psi [ MPa]. The ultimate tensile load in pounds-force [newtons]for individual fibers shall be measured to at least threesignificant figures. Testing shall be in accordance with TestMethods and Definitions A, where applicable. NOTE 2—The bending requirements of this specification provide ageneral indication of fiber ductility, as may be important in resistingbreakage during handling and mixing operations.

Ductility measures offiber-reinforced concrete are outside the scope of this specification; seeACI It shall be permissible toperform bend tests manually. At least one test consisting of tenspecimens shall be made for each 5 tons [4 kg] of material. Dimensions and Permissible Variations8. Nominal aspect ratio ln can be computed as follows. Equivalent diameter is computed as in8. Therefore a user should provide the limitson diameter or equivalent diameter allowable. Workmanship, Finish, and Appearance9.

Exceptas otherwise specified in the purchase order or contract, themanufacturer may use his own or any other suitable facility forthe performance of the inspection and test requirements speci-fied herein unless disapproved by the purchaser.

The purchasershall have the right to perform any of the inspections and testsset forth in this specification where such inspections aredeemed necessary to ensure that material conforms to pre-scribed requirements.

Rejection and Rehearing Samples representing fibersrejected by the purchaser shall be preserved until disposition ofthe claim has been agreed to between the supplier and thepurchaser. This retest shall be performed on twice thenumber of randomly selected specimens originally tested. Theresults of the retest shall meet the requirements of thisspecification or the lot shall be rejected. Notwithstanding the absence of a signature, theorganization submitting the document is responsible for itscontent.

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More A Tensile and bend tests of randomly-selected finished fibers shall be performed. Measurement of dimensions shall be performed and values should conform to permissible variations of length, nominal length, diameter, equivalent diameter, aspect ratio, and nominal aspect ratio. Guidelines for inspection, rejection, rehearing, certification, and packaging are also given. 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.

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A number in parentheses indicates the year of last reapproval. Fivetypes of steel fibers for this purpose are defined as pieces ofsmooth or deformed cold-drawn wire; smooth or deformed cutsheet; melt-extracted fibers; mill-cut or modified cold-drawnwire steel fibers that are sufficiently small to be dispersed atrandom in a concrete mixture. In the case of a conflictbetween a requirement of the product specification or arequirement of this specification and a more stringent require-ment of the purchase order, the purchase order shall prevail. The purchase order requirements shall not take precedence ifthey, in any way, violate the requirements of the productspecification or this specification; for example, by the waivingof a test requirement or by making a test requirement lessstringent. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard. Referenced Documents2.

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