ASTM C 1812/C1812M : 2022
Current
The latest, up-to-date edition.
Standard Practice for Design of Journal Bearing Supports to be Used in Fiber Reinforced Concrete Beam Tests
Hardcopy , PDF
English
10-01-2023
Important note : All end users must be registered with an Account prior to user licenses being assigned.| Committee |
C 09
|
| DocumentType |
Standard Practice
|
| Pages |
7
|
| PublisherName |
American Society for Testing and Materials
|
| Status |
Current
|
| Supersedes |
1.1This practice prescribes the design of journal-bearing type rollers to support each end of fiber-reinforced concrete beams tested using Test Method C1399/C1399M or Test Method C1609/C1609M. The roller design is intended to provide a consistent and relatively low value of effective coefficient of friction at the beam supports. The bearing design incorporates metal-on-metal sliding surfaces lubricated with grease.
Note 1:During the progress of a test, a crack or cracks open on the underside of the beam between the loaded third points causing the underside of each portion of the beam to move away from the center. The design is intended to provide for unlimited rotation of the roller at the point of contact with the test beam in response to this motion.
Note 2:The design of the supporting rollers is a significant factor in determining the magnitude of the arching forces that cause error in flexural test results.2 Improperly designed supporting rollers can influence the apparent flexural behavior of fiber-reinforced concrete beams.3 The effective coefficient of friction can be determined using a method similar to that described by Bernard.4
1.2The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.3Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
| ASTM C 1609/C1609M : 2019 : REV A | Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading) |
| ASTM C 1903 : 2021 | Standard Specification for Precast Concrete Duct Bank |
| ASTM D 4950 : 2022 | Standard Classification and Specification for Automotive Service Greases |
| ASTM C 1399/C1399M : 2010 : R2015 | Standard Test Method for Obtaining Average Residual-Strength of Fiber-Reinforced Concrete (Withdrawn 2024) |
| ASTM C 125 : 2024 | Standard Terminology Relating to Concrete and Concrete Aggregates |
| ASTM C 1609/C1609M : 2024 | Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading) |
| ASTM D 4950 : 2019 | Standard Classification and Specification for Automotive Service Greases |
| ASTM C 125 : 2021 : REV A | Standard Terminology Relating to Concrete and Concrete Aggregates |
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