On the mechanical properties and crack pattern analysis of a strain-hardening cement-based composite reinforced by natural sisal fibers

Materia

article

Felipe Pinheiro Teixeira¹  Felipe Rodrigues de Souza²  Victor Nogueira Lima²  Flávio de Andrade Silva²  Sergio Luis González Garcia¹ 

[1]Universidade Estadual do Norte Fluminense Darcy Ribeiro

[2]Pontifícia Universidade Católica do Rio de Janeiro

关键词: Cement composite;    Natural fibers;    Mechanical properties;    Crack pattern analysis;   

DOI  :  10.1590/1517-7076-RMAT-2022-0181

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 】

Besides the strength enhancement and strain improvement (strain-hardening behavior), the use of natural fibersas reinforcement in cement-based matrices can also be highlighted as an economical and eco-friendly alternativefor the future of the construction industry. In the present work, cement-based composites reinforced by naturalsisal fibers were produced and tested under direct tensile loading. The Portland cement was partially replaced bypozzolans (metakaolin – MK and fly ash – FA), aiming to produce a calcium hydroxide-free matrix to ensure thedurability of the fibers. The natural sisal fibers were used in a 5% volume fraction (in mass), divided into threelayers. The mechanical properties of composite plates were compared to other literature results and demonstrated to be compatible with recent research. The crack pattern was analyzed by Digital Image Correlation(DIC) for a better understanding of their failure mechanisms. The material presented a tensile strength increaseafter the first crack formation, marked by multiple cracking partners from this point. Finally, a comparisonbetween direct (LVDTs) and indirect (DIC) methods of strain measurement was done and demonstrated minorresults for the DIC, approximately 84% of those obtained from the LVDTs.

【 授权许可】

CC BY