Work Item
ASTM WK73384

New Test Method for Evaluating the Tensile Performance of Fiber-Reinforced Concrete Using Cylindrical Specimens with Double-Punch Loading

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

Double-punch Test; fiber-reinforced concrete; ultra-high-performance concrete; tensile test

Rationale

A new test method is proposed for determining the tensile strength and post cracking performance of fiber-reinforced concrete (FRC). The method is based on the double-punch test method (DPTM) of loading a cylindrical specimen with a length-diameter ratio of 1. The DPTM involves loading the specimen in a compression testing machine through 1.5-in. diameter punches at each end. This type of loading results in indirect tensile stresses on radial planes, leading to multiple cracks in the specimen. Vertical movement of the testing machine is measured providing a load-deformation curve from which the initial specimen stiffness, the peak tensile strength, and the residual strength at a specified post-peak deformation can be calculated. Optionally, the average crack width can be estimated as a function of the deformation. The advantages of the DPTM over flexural test methods include the following: 1) a larger crack area develops leading to a more averaged performance; 2) simpler apparatus is required making it suitable for routine QC testing; 3) it allows evaluation of the in-place properties of FRC by testing drilled cores; and 4) the single-operator variability is lower.

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: 06-28-2020

Technical Contact: Shih-Ho Chao

Item: 001

Ballot: C09.42 (20-02)

Status: Will Reballot Item