Historical Version s - view previous versions of standard. More C It allows for comparative analysis among beams containing different fiber types, including materials, dimension and shape, and different fiber contents. Results can be used to optimize the proportions of fiber—reinforced concrete mixtures, to determine compliance with construction specifications, to evaluate fiber—reinforced concrete which has been in service, and as a tool for research and development of fiber—reinforced concrete See Note 2.
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The average residual strength is computed using specified beam deflections that are obtained from a beam that has been cracked in a standard manner. The test provides data needed to obtain that portion of the load-deflection curve beyond which a significant amount of cracking damage has occurred and it provides a measure of post-cracking strength, as such strength is affected by the use of fiber-reinforcement.
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 non-conformance with the standard. 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.
TB-1205 - STRUX® 90/40 ASTM C1399 vs. ASTM C1609
ASTM C determines the slow crack growth parameters of advanced fiber-reinforced concrete by using constant stress-rate flexural testing in which flexural strength is determined as a function of applied stress rate in a given environment at ambient temperature. The universal test machine must be capable of controlling the rate of motion of the loading head and meeting the requirements of test method ASTM C A load rating of 10, lbf will generally be required. A third point bend test or four point bend test can be performed. In four point bend tests, the maximum flexural stress is spread out over the section of the beam between loading points. Third point bending is a special form of four point bending tests only with three equal spans.
ASTM C1399 Residual Strength Fiber-Reinforced Concrete Test Equipment
Both are commonly used but there are some major differences between them and where they should be specified. This test method covers the determination of the average residual strength ARS of a fiber-reinforced concrete test beam supported by a steel plate underneath the entire length. The flexural beam is initially cracked from an applied load up to a deflection of 0. The steel plate is then removed and the post-crack deflections and loads are measured and recorded during the test up to a final deflection of 0. The ARS is computed using loads at specified beam deflections that are obtained during the test. This test provides the data needed to obtain the portion of the load-deflection curve beyond which a significant amount of cracking damage has occurred. It also provides an average measure of post-cracking or residual strength obtained by the use of fiber-reinforcement.
Test Method for Obtaining Average Residual-Strength of Fiber-Reinforced Concrete