Characterisation of the tensile constitutive behaviour of fibre-reinforced concrete: A new configuration for the Wedge Splitting Test

Autor(es)

Segura-Castillo, Luis ^[1] ; Monte, Renata ^[2] ; de Figueiredo, Antonio D. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Republica, UdelaR, Montevideo - Uruguay

^[2] Univ Sao Paulo, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CONSTRUCTION AND BUILDING MATERIALS; v. 192, p. 731-741, DEC 20 2018.
• Citações Web of Science: 2

Resumo

The fib Model Code chose the EN14651 test as the basic method for evaluating the structural behaviour of fibre-reinforced concrete (FRC). However, there are technological restrictions that must be considered. For example, this test has a relatively complex execution, and it is difficult to carry it out under samples extracted from real structures. In this study, an experimental campaign is developed to validate a new test, called Montevideo (MVD) test, for FRC. The test is based on the wedge-splitting test, but simplifications in terms of sample preparation and loading device allow it to be used in routine quality control. The results show a) a stable friction coefficient between the wedge and sample; b) a linear relationship between wedge displacement and crack mouth opening displacement (CMOD), which allows conducting the test through the stroke displacement only; c) a coefficient of variation below the usual range of the EN14651 test; and d) a load correlation factor (k(MVP) = 2.5) to transform the loads from the MVD test to EN14651 test for large values of CMODs (above 2 mm). This test can be performed on samples prepared from extracted cores with an open displacement control system in specimens with softening behaviour, and without producing post-peak instabilities. The development of the MVD test provides a practical and simple method for controlling the FRC quality, complementary to the EN14651 test. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/05255-5 - Desenvolvimento de um ensaio compacto para avaliação da resistência residual do concreto com fibras
• Beneficiário: Antonio Domingues de Figueiredo
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional