Work Item
ASTM WK76738

New Test Method for Flexural Toughness and Performance of Fiber-Reinforced Concrete (using Centrally Loaded Small Round Panel)

1. Scope

(1) The assembling and study of data pertaining to the properties of hydraulic-cement concrete and its constituent materials, including the study of the effect of characteristics of materials and mixture proportions upon the properties of concrete; and (2) the development of standards for concrete and for the constituent materials of concrete (except cement), as well as for certain related materials, such as materials used in curing or repair of concrete.
2.2 The scope of the Committee does not include the field of design and construction of concrete structures except insofar as references need to be made to construction methods in special cases of concrete as “over- the-counter” material.

NOTE: In accordance with an agreement between ASTM and the American Concrete
Institute (ACI), ACI will refrain from specification writing for “over-the-counter” engineering materials and ASTM will refrain from standardization efforts in design and construction practice.

Keywords

Energy absorption; fiber reinforced concrete; flexure; post-cracking behavior; toughness; round panel; small round panel; residual strength

Rationale

The post-crack behavior of plate-like, fiber-reinforced concrete structural members is well represented by a centrally loaded round panel test specimen that is simply supported on three pivots symmetrically arranged around its circumference. Such a test panel experiences bi-axial bending in response to a central point load and exhibits a mode of failure related to the in situ behavior of structures. The post-crack performance of round panels subject to a central point load can be represented by the energy absorbed by the panel up to a specified central deflection. Unlike Test Method C1550, this test procedure allows for the complete recording of the three expected cracks. It provides for the determination of first-peak and peak loads. It also requires determination of residual flexural strengths f150,0.75 and f150,3.00 (defined according to Test Method C1609). It provides for determination of specimen flexural toughness based on the area under the load-deflection curve (expressed as energy absorption) up to a prescribed central deflection.

The title and scope are in draft form and are under development within this ASTM Committee.

Details

Developed by Subcommittee: C09.42

Committee: C09

Staff Manager: W Scott Orthey

Work Item Status

Date Initiated: 04-30-2021

Technical Contact: Fausto Minelli

Item: 000

Ballot:

Status: