Influence of the instability of the double punch test on the post-crack response of fiber-reinforced concrete

Author(s)

Ribeiro Simao, Luana de Carvalho ^[1] ; Nogueira, Andre Baltazar ^[1] ; Monte, Renata ^[1] ; Salvador, Renan P. ^{[2, 1]} ; de Figueiredo, Antonio Domingues ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Civil Construct Engn, Polytech Sch, Prof Almeida Prado Ave, Trav 2, 83, BR-05424970 Sao Paulo - Brazil

^[2] Univ Sao Judas Tadeu, Dept Civil Engn, 546 Taquari St, BR-03166000 Sao Paulo - Brazil

• Document type: Journal article
• Source: CONSTRUCTION AND BUILDING MATERIALS; v. 217, p. 185-192, AUG 30 2019.
• Web of Science Citations: 1

Abstract

The characterization of the post-crack behavior of fiber-reinforced concrete (FRC) is essential in order to properly design and apply this composite. Although beam tests (3 and 4 points) are standardized for this purpose, a simpler methodology is necessary to be designated as a regular quality control method. In this context, the research presented in this paper focuses on the evaluation of the double punch test (DPT) as an alternative method to control the mechanical behavior of FRC. Tests were performed in open and closed-loop test machines to verify if the instabilities caused after the matrix cracks compromise the determination of residual strength. Results showed that when open-loop test machines are employed, post-crack instability is greater. However, it does not influence the determination of residual strength negatively. Therefore, the DPT performed in open-loop test machines may be used for the routine analysis and characterization of FRC. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 17/00125-9 - Characterization of chemical properties, mechanical performance and durability of sprayed concrete
• Grantee: Renan Pícolo Salvador
• Support Opportunities: Scholarships in Brazil - Post-Doctoral