Cracking mechanisms in durable sisal fiber reinforced cement composites

Silva, Flávio de Andrade; Mobasher, Barzin; Filho, Romildo Dias Toledo

doi:10.1016/j.cemconcomp.2009.07.004

Cited by 223 publications

(96 citation statements)

References 14 publications

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“…In order to overcome these problems, Toledo Filho et al [18] used unidirectional sisal strands to reinforce cement-based composites, which significantly improved the tensile strength and toughness [19][20][21]. Although interesting results are obtained with these strands, it is difficult to produce these composites industrially using an automated laminating process.…”

Section: Introductionmentioning

confidence: 99%

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Claramunt

Fernández-Carrasco

Ventura

et al. 2016

Construction and Building Materials

109

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This experimental research analyzes the mechanical performance and durability of façade pieces based on Portland cement matrix and flax nonwovens as reinforcement. Two types of pozzolanic additions (silica fume and metakaolin) combined with nonwovens subjected to different treatments to decrease their water absorption are analyzed as potential materials for fiber-cement sheets for building envelopes with high strength and durability. For this purpose, on the one hand, the mechanical performance and chemical composition of various ternary compositions were studied. On the other hand, various treatments were performed on the nonwovens and the nonwoven-matrix adherence was also analyzed. Finally, composites were prepared from some selected treated nonwovens and matrix mixtures, and their mechanical properties and durability were evaluated under four-point bending tests after 28 days of curing in a humidity chamber and after accelerated aging. The composites developed with the treated nonwovens presented very high performance combined with enough durability to be potential candidates for the development of sustainable materials for building envelopes. Highlights-Mechanical performance and durability of OPC/flax nonwovens composites for façade pieces is explored -The effect of two pozzolanic additions combined with nonwoven treatment is evaluated -Significant improvements in the durability using treated nonwovens 3

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Section: Introductionmentioning

confidence: 99%

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Claramunt

Fernández-Carrasco

Ventura

et al. 2016

Construction and Building Materials

109

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“…Generally, fibres' ability to resist crack deflection, debonding, and to bridge cracks, slows down crack propagation in fibre reinforced composites and increases the fracture energy [39][40][41][42]. Figure 8 shows the influence of FF content on the fracture toughness of geopolymer composites.…”

Section: Fracture Toughnessmentioning

confidence: 99%

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

et al. 2015

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This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites. Geopolymer composites reinforced with 2.4, 3.0 and 4.1 wt% woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength, flexural modulus, compressive strength, hardness, and fracture toughness. All mechanical properties were improved by increasing the flax fibre contents, and showed superior mechanical properties over a pure geopolymer matrix. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites. The thermal behaviour of composites was studied by thermogravimetric analysis (TGA) and the results showed significant degradation of flax fibres at 300 ℃.

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“…The focus in these works has been on the evaluation of the mechanical properties of the resulting composites as a function of the characteristics of their constituents, and the results obtained have indicated the viability of using natural fibers as reinforcing agents. Cement composite laminates reinforced with long sisal fibers, manufactured using a cast hand lay up technique, were found to exhibit high energy absorbing capacity reflected in high toughness values under tension and bending loads 11 . Ultimate strength, on the other hand, achieved average levels of 12 and 25 MPa for tensile and bend loading, respectively 11 .…”

Section: Introductionmentioning

confidence: 99%

“…Cement composite laminates reinforced with long sisal fibers, manufactured using a cast hand lay up technique, were found to exhibit high energy absorbing capacity reflected in high toughness values under tension and bending loads 11 . Ultimate strength, on the other hand, achieved average levels of 12 and 25 MPa for tensile and bend loading, respectively 11 . It can thus be stated that, despite a tolerable degradation in their compressive strength, flexural strength and fracture toughness of the reinforced composites were significantly enhanced due to the presence of natural fibers, consistent with experimental data reported by Abu-Lebdeh and coauthors 3 .…”

Section: Introductionmentioning

confidence: 99%

On the Strengthening of Cement Mortar by Natural Fibers

et al. 2015

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The purpose of this work is to evaluate mechanical behavior of sisal fiber reinforced cement mortar. The composite material was produced from a mixture of sand, cement and water. Sisal fibers were added to the mixture in two different lengths. Mechanical characterization of the composite and the plain mortar was carried out using three point bend, compression and impact tests. Specimens containing parallel sided notches of different root radii were loaded in three point bending in order to determine the effect of the fibers on the material fracture toughness in the presence of discontinuities. According to the results, while fiber reinforcement leads to a decrease in compressive strength, J-integral calculations at maximum load for the different notch root radii have indicated, particularly for the case of long fibers, a significant superiority of the reinforced material in comparison with the plain cement mortar, in consistence with the impact test data.

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Cracking mechanisms in durable sisal fiber reinforced cement composites

Cited by 223 publications

References 14 publications

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

On the Strengthening of Cement Mortar by Natural Fibers

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