Publicação
Multiple cracking under flexion of short sisal fiber-cement composites produced with recycled matrix
| Resumo: | Sisal fiber–cement composites reinforced with short fibers were developed and their physical–mechanical behavior was characterized in the present study. To ensure the composite sustainability and durability, the ordinary Portland cement matrix was modified by adding metakaolin and the natural aggregate was substituted by 10% and 20% of recycled concrete aggregate. Flat sheets were cast in a self-compacted cement matrix and bending tests were performed to determine the first crack, postpeak strength and toughness of the composites. Cyclic flexural test was carried out to determine the dissipated energy of composite due cracking. It is verified that the use of short sisal fiber as reinforcement of recycled cement matrices results in a composite with multiple cracking and increment of strength after first crack. Reduction of stiffness with progressive cracking can be reduced with increment of fiber content. The modeling of composites using finite element method allowed to determine the tensile stress-strain behavior of material and to design possible applications of this new sustainable material |
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| Autores principais: | Lima, Paulo Roberto Lopes |
| Outros Autores: | Barros, Joaquim A. O.; Santos, Daniele O. Justo dos; Fontes, Cintia Maria Ariani; Lima, José Mário Feitosa; Toledo Filho, Romildo D. |
| Assunto: | Flexural behavior Finite element method Sisal-cement composite Engenharia e Tecnologia::Engenharia Civil |
| Ano: | 2014 |
| País: | Portugal |
| Tipo de documento: | comunicação em conferência |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Sisal fiber–cement composites reinforced with short fibers were developed and their physical–mechanical behavior was characterized in the present study. To ensure the composite sustainability and durability, the ordinary Portland cement matrix was modified by adding metakaolin and the natural aggregate was substituted by 10% and 20% of recycled concrete aggregate. Flat sheets were cast in a self-compacted cement matrix and bending tests were performed to determine the first crack, postpeak strength and toughness of the composites. Cyclic flexural test was carried out to determine the dissipated energy of composite due cracking. It is verified that the use of short sisal fiber as reinforcement of recycled cement matrices results in a composite with multiple cracking and increment of strength after first crack. Reduction of stiffness with progressive cracking can be reduced with increment of fiber content. The modeling of composites using finite element method allowed to determine the tensile stress-strain behavior of material and to design possible applications of this new sustainable material |
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