Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mechanics and Cracking Mechanisms in Natural Curauá Textile Reinforced Concrete
Abstract In the present work, high performance natural curauá (Ananas erectifolius) uni-directional fabrics were used to reinforce a cementitious composite. The Portland cement was partially replaced by pozzolanic materials, namely metakaolin and fly ash, in order to provide a matrix with low calcium hydroxide content. Composites with one, three and five fabric layers were produced. Their mechanical behavior was evaluated through direct tensile and four point bending tests. The composite crack spacing was measured using image analysis and correlated with the applied strain under both the tensile and bending response. Various stages of loading corresponding to initiation, propagation, distribution, opening and localization of a crack system in the specimen are discussed. The effect of flexural cracking on the composite stiffness was measured using strain-gages. The autogenous healing capability of the three layered composite system was analyzed by means of the mechanical behavior in a cyclic bending test. Preliminary results indicate that cementitious composites reinforced with curauá uni-directional fabrics present a strain hardening behavior and have autogenous healing intrinsic properties.
Mechanics and Cracking Mechanisms in Natural Curauá Textile Reinforced Concrete
Abstract In the present work, high performance natural curauá (Ananas erectifolius) uni-directional fabrics were used to reinforce a cementitious composite. The Portland cement was partially replaced by pozzolanic materials, namely metakaolin and fly ash, in order to provide a matrix with low calcium hydroxide content. Composites with one, three and five fabric layers were produced. Their mechanical behavior was evaluated through direct tensile and four point bending tests. The composite crack spacing was measured using image analysis and correlated with the applied strain under both the tensile and bending response. Various stages of loading corresponding to initiation, propagation, distribution, opening and localization of a crack system in the specimen are discussed. The effect of flexural cracking on the composite stiffness was measured using strain-gages. The autogenous healing capability of the three layered composite system was analyzed by means of the mechanical behavior in a cyclic bending test. Preliminary results indicate that cementitious composites reinforced with curauá uni-directional fabrics present a strain hardening behavior and have autogenous healing intrinsic properties.
Mechanics and Cracking Mechanisms in Natural Curauá Textile Reinforced Concrete
Souza, Leticia O. (Autor:in) / Souza, Lourdes M. S. (Autor:in) / Silva, Flávio A. (Autor:in)
05.09.2017
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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