Effect of DEWS test simplification on the design post-crack parameters of steel fiber reinforced concrete with different fiber contents

Autor(es)

Coronel, Stefany dos Anjos ; Serafini, Ramoel ; Rambo, Dimas Alan Strauss ; Salvador, Renan Picolo ; Bitencourt Junior, Luis Antonio Guimaraes

• Tipo de documento: Artigo Científico
• Fonte: CONSTRUCTION AND BUILDING MATERIALS; v. 470, p. 11-pg., 2025-02-27.

Resumo

The Double-Edge Wedge Splitting (DEWS) test presents several advantages as an indirect test to determine the post-crack tensile parameters of steel fiber-reinforced concrete (SFRC). However, practical challenges related to the preparation of notched and wedged specimens, as well as the precise control of crack opening using extensometers, limit its large-scale applicability. This study aimed to assess the feasibility of a simplified DEWS test by eliminating the need for extensometers through a geometric correlation between crack opening and stroke displacement. The experimental program evaluated three SFRC mix designs with commercial steel fiber contents of 20, 40, and 60 kg/m3, comparing the conventional and simplified DEWS methodologies. The molding procedure resulted in a significant increase in terms of post-cracking strength for both the serviceability limit state (SLS) and the ultimate limit state (ULS) for fiber contents of 40 and 60 kg/m3. However, no significant difference in post-crack tensile strength was observed between the specimen preparation methods for the group with a fiber content of 20 kg/m3. The correlation between crack opening and stroke displacement proved to be adequate, with an average error of around 10 %, being higher for lower fiber volumes. The study contributes to advancing testing methodologies by offering a more efficient and cost-effective approach for determining the post-cracking properties of SFRC, potentially informing future standardization efforts and promoting optimized practices in the construction industry. (AU)

• Processo FAPESP: 22/03179-0 - Modelagem multiescala do concreto simples e reforçado com fibras de aço e sua aplicação na predição do comportamento de elementos estruturais
• Beneficiário: Luís Antônio Guimarães Bitencourt Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Projeto Inicial
• Processo FAPESP: 22/14045-5 - O efeito das elevadas temperaturas em concretos com fibras de aço submetidas a tratamento superficial com nanosílica: comportamento ao arrancamento, propriedades mecânicas e simulação numérica
• Beneficiário: Ramoel Serafini
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 23/09896-9 - Orientação magnética robotizada de fibras de aço como estratégia para reforçar elementos de concreto: desenvolvimento, caracterização físico-mecânica e análises de imagem
• Beneficiário: Dimas Alan Strauss Rambo
• Modalidade de apoio: Auxílio à Pesquisa - Regular