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Master's Dissertation
DOI
10.11606/D.18.2011.tde-05042011-164738
Document
Author
Full name
Indara Soto Izquierdo
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2011
Supervisor
Committee
Ramalho, Marcio Antonio (President)
Liborio, Jefferson Benedicto Libardi
Prudencio Junior, Luiz Roberto
Title in Portuguese
Uso de fibra natural de sisal em blocos de concreto para alvenaria estrutural
Keywords in Portuguese
Alvenaria estrutural
Blocos de concreto reforçados com fibras
Compósitos
Fibra de sisal
Módulo de elasticidade
Resistência à compressão
Abstract in Portuguese
A utilização de fibras vegetais como reforço constitui um grande interesse na obtenção de novos materiais para a construção civil produto de seu baixo custo, alta disponibilidade e reduzido consumo de energia para sua produção. Este trabalho avalia a incorporação de fibras de sisal, de comprimento 20 e 40 mm, e fração volumétrica de 0,5 e 1%, em concretos para a alvenaria de blocos estruturais e determina o uso destas unidades na execução de prismas e mini-paredes. Foram realizados os testes de caracterização da fibra, blocos e argamassa de assentamento e os ensaios de resistência à compressão axial das unidades, prismas e mini-paredes. O sisal apresentou baixa massa específica aparente e elevada absorção de água, constituindo uma característica comum desse tipo de material pela grande incidência de poros permeáveis. As propriedades físicas dos blocos com e sem adição cumpriram com os requisitos das normas estabelecidas validando sua utilização. Os resultados do ensaio à compressão mostraram que as mini-paredes reforçadas com fibras obtiveram valores muito próximos ou mesmo superiores aos obtidos para as mini-paredes sem fibras, apresentando melhor desempenho que os blocos e prismas. Todos os elementos com adição mostraram um ganho da capacidade de deformação e ductilidade conferida pelas fibras, observado nas curvas tensão x deformação. O modo de ruptura dos blocos, prismas e mini-paredes de referência foi caracterizado por uma fratura brusca e catastrófica e os reforçados mantiveram suas partes unidas pelas fibras, não perdendo sua continuidade e tornando a ruptura um processo progressivo.
Title in English
Use of natural sisal fiber in concrete blocks for structural masonry
Keywords in English
Blockwork masonry
Composites
Compressive strenght
Concrete block reinforced with fibers
Modulus of elasticity
Sisal fiber
Abstract in English
The use of natural fibers as reinforcement is a great interest in obtaining new materials for construction, owing of its low cost, high availability and reduced energy consumption for its production. This paper evaluates the incorporation of sisal fibers of 20 mm and 40 mm length and volume fraction of 0.5 and 1%, for concrete for masonry structural blocks, and determines the use of these units in making of prisms and mini-walls. The laboratory tests were carried to characterize physical properties the fiber, blocks and mortar, and besides axial compression tests of the units, prisms, and mini-walls. The sisal had low apparent density and high water absorption, constituting a common feature of such material by the high incidence of permeable pores. The physical properties of the blocks with and without addition complied with the requirements of standards established by validating their use. The axial compression test results showed that mini-walls reinforced with fibers obtained values very close to or even superior to those obtained for the mini-walls without fibers, showing better performance than the blocks and prisms. All elements with the addition had increased the deformation capacity and ductility afforded by the fibers, observed in the curves stress/strain. The rupture mode of blocks, prisms and mini-walls reference was characterized by an abrupt and catastrophic fracture, and elements reinforced maintained their shares together by the fibers, without losing its continuity and becoming a progressive rupture.
 
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Publishing Date
2011-04-13
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • SOTO, I. I., and RAMALHO, M. A. Elements of Structural Masonry Reinforced with Sisal Fibers. Journal of Civil Engineering and Architecture [online], 2013, vol. 7, p. 141-146. [cited 2013-08-24]. Available from : <http://www.davidpublishing.com>
  • SOTO, I. I., e RAMALHO, M. A. Uso de fibra natural de sisal em blocos de concreto para alvenaria. Cadernos de Engenharia de Estruturas [online], 2011, vol. 13, p. 55-72. [acesso 2013-08-24]. Disponível em : <http://cadernos.set.eesc.usp.br/>
  • SOTO, I. I., RAMALHO, M. A., and IZQUIERDO, O. S. Post-cracking behavior of blocks, prisms, and small concrete walls reinforced with plant fiber [doi:10.1590/S1983-41952013000400006]. Revista IBRACON de Estruturas e Materiais [online], 2013, vol. 6, n. 4, p. 598-612.
  • SOTO, I. I., and RAMALHO, M. A. Blocks of concrete reinforced with natural sisal fibres for use in masonry. In Fibre Reinforced Concrete: challenges and opportunities [CD-ROM], 8, Guimarães, Portugal, 2012. Guimarães, Portugal : RILEM Publications S.A.R.L, 2012. p. 307. ISBN 9782351581.
  • SOTO, I. I., and RAMALHO, M. A. Use of natural sisal fibre in concrete blocks for strutural masonry. In 15th International Brick and Block Masonry Conference [CD-ROM], 15, Florianópolis, Brasil, 2012. Florianópolis, Brasil : Federal University of Santa Catarina, 2012. p. 29. ISBN 9788563273.
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