Avaliação da resistência ao cisalhamento direto de concretos autoadensável e convencional

Materia

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Kellyn Maressa Pufal¹  Gustavo Savaris²  Carlos Eduardo Tino Balestra²  Gustavo Henrique Dalposso²  Sergio Luis González Garcia³ 

[1] Universidade Federal do Rio Grande do Sul;Universidade Tecnológica Federal do Paraná;Universidade Estadual do Norte Fluminense Darcy Ribeiro

关键词: Self-consolidating concrete;    Direct shear;    Strength;    Shear Stress;    Interlock;   

DOI  :  10.1590/S1517-707620210003.13036

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The self-consolidating concrete presents properties that improve the constructive process, it has the main characteristic of flowing under its own weight and completely filling the formwork, without the need of compaction. However, the uncertainty about its shear strength, due to the differences in coarse aggregate volume and size of this concrete compared to conventional vibrated concrete, is one of the main barriers to its acceptance. Self-consolidating concrete mixtures requires generally the reduction of coarse aggregate content and addition of fines materials to obtain flowability and the reduction of particles size directly influences the mechanism of aggregate interlock. In this work, two concrete mixtures, conventional and self-consolidating, were used for casting test specimens, submitted to the direct shear test, in order to evaluate the direct shear strength of these concretes. The results showed a reduction of the shear strength for the self-compacting concrete, attributed to the use of coarse aggregate with smaller particle size, the reduced volume of coarse aggregate and the larger fines content in the mixture. The experimental results were compared with equations proposed in the literature, demonstrating that for self-consolidating concrete these equations underestimate the ultimate shear strengths. Thus, this work contributes to the formation of a database aiming the establishment of equations to estimate self-consolidating concrete shear strength.

【 授权许可】

CC BY