| Texto completo | |
| Autor(es): |
Número total de Autores: 4
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| Afiliação do(s) autor(es): | [1] Univ Fed Bahia, Polytech Sch, Dept Sci & Technol Mat, BR-05508900 Salvador, BA - Brazil
[2] Univ Sao Paulo, Polytech Sch, Dept Struct & Geotech Engn, Sao Paulo - Brazil
[3] Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Biosyst Engn, Sao Paulo - Brazil
[4] Univ Sao Paulo, Polytech Sch, Dept Construct Engn, Sao Paulo - Brazil
Número total de Afiliações: 4
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| Tipo de documento: | Artigo Científico |
| Fonte: | CONSTRUCTION AND BUILDING MATERIALS; v. 190, p. 975-984, NOV 30 2018. |
| Citações Web of Science: | 0 |
| Resumo | |
The concept of functionally graded materials (FGM) has been successfully applied in the development of many advanced cement-based composites. In the fiber-cement sector, however, little attention has been given to this approach. In this paper, the mechanical behavior of corrugated asbestos-free (AF) fiber cement and asbestos-cement (AC) sheets are compared, and the FGM concept is used to improve the production cost and mechanical performance of corrugated asbestos-free (AF) fiber-cement products compared to asbestos-cement sheets. A loaded AF sheet was modeled using the finite element method to assess and develop strategies for improving its mechanical performance, leading to the linking of FGM and Hatschek technologies to locally address performance issues. Tensile tests indicated that the AF fiber-cement sheets initially crack at stresses about 50% lower than AC sheets. The FEM models, in turn, indicated that the flat regions between the crowns and valleys of the corrugated sheet are only subject to low intensity stresses under bending and wind loadings. In this work, instead, we propose the application of fibrous mixtures between layers of corrugated fiber-cement sheets as an alternative strategy for controlling the distribution of fibers along Hatschek-made corrugated sheets. In preliminary tests conducted on a pre-industrial scale, the application of extrudable fibrous cementitious mixtures between the layers of Hatschek-made AF fiber-cement sheets resulted in an approximately 10% increase in the limit of proportionality and modulus of rupture. The results indicate that the proposed technique presents an excellent potential to produce functionally graded corrugated sheets whose fiber contents and mechanical strengths are controlled locally. (C) 2018 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 05/03943-7 - Desenvolvimento de fibrocimentos com gradientes funcionais de propriedades |
| Beneficiário: | Cleber Marcos Ribeiro Dias |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |