Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10128335 | Cement and Concrete Composites | 2018 | 38 Pages |
Abstract
This work presents the durability studies carried on strain-hardening cement-based composites reinforced with 4% of 40â¯mm alkali treated natural curaua fiber. The collected results present the influence of natural weathering periods of 6 and 12 months on the composite tensile properties. The strain-softening behavior of the composites exposed to weathering is motivated by the deterioration of fiber-matrix bond, observed by the reinforcement work indicators, pull-out tests and visual inspection of the interfacial transition zone. Matrix specimens exposed to natural weathering provided information on pH variation along the specimen's cross-section and the chemical analysis related the pH difference to the presence of amorphous carbonates, and free from calcium hydroxide as the matrix was designed. The deterioration of post-crack fiber reinforcement capacity, thus the absence of strain-hardening behavior, was caused by fiber-matrix void observed under microscope, which deteriorated the fiber-matrix connection.
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Authors
Bartosz Zukowski, Edson Rodrigo Fernandes dos Santos, Yasmim Gabriela dos Santos Mendonça, Flávio de Andrade Silva, Romildo Dias Toledo Filho,