Effect of Treatment of Sisal Fiber on Morphology, Mechanical Properties and Fiber-Cement Bond Strength

2014 ◽  
Vol 634 ◽  
pp. 410-420 ◽  
Author(s):  
Rogério de Jesus Santos ◽  
Paulo Roberto Lopes Lima
Keyword(s):  
Tensile Strength ◽  
Factorial Design ◽  
Morphological Characterization ◽  
Sisal Fiber ◽  
Pull Out ◽  
Gradual Loss ◽  
The Matrix ◽  
Number Of Cycles ◽  
Sisal Fibers ◽  
Dimensional Instability

The dimensional instability of vegetable fibers due to hygroscopicity results in a gradual loss of adherence in cement based composites which, when in service, are submitted to a natural variation of humidity. Such an effect reduces the contribution of the fiber as a reinforcement and can cause the early rupture of the material. In this work, a treatment of the sisal fibers is performed with the applying of wetting-drying cycles in order to alter their crystalline structure and improve the dimensional stability of the fiber to withstand the variation of humidity: 6, 10, 20, 30 and 34 cycles were applied in order to evaluate the effect on the properties of fiber; a tensile test, the morphological characterization (MEV) and the evaluation of the chemical structure of fiber were carried out. The effect of the treatment on fiber-matrix behavior was evaluated using the pull-out test. Embedded lengths of 16, 20, 30, 40 and 44 mm were defined through a factorial design and used in the test. It is verified that the use of 10 wetting-drying cycles causes less damage to the tensile strength and the elastic modulus of the fiber and contributes to a better adherence with the matrix, with an increase of up to 23 % compared with the untreated fiber. The statistical analysis of the interaction effect between the studied factors, using 2K factorial design with central composite design, indicates that the number of cycles can be decreased when using a longer length of the embedded fiber.Keywords: wetting-drying cycles, pull out test, tensile strength..

Test Comparison Research Mechanics Performance between Sisal Fiber Concrete and Rubber Powder Concrete

2011 ◽  
Vol 243-249 ◽  
pp. 494-498
Author(s):  
Hui Ming Bao
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Sisal Fiber ◽  
Environment Friendly ◽  
Rubber Powder ◽  
Comparison Research ◽  
Mechanics Performance ◽  
Fiber Concrete ◽  
Sisal Fibers

By means of the tests on the mechanics performance of the reinforcing concrete mixed with sisal fibers or rubber powder of certain content are investigated. The compressive strength, tensile strength and flexural strength, etc. are compared. The test indicates that when the test condition is same, the compressive strength, tensile strength and flexural strength of the sisal fibers concrete are better than those of the rubber powder’s. The sisal fiber concrete is environment friendly than the rubber powder concrete. And it has widely value of spread and utilization.

Effect of Sisal Fiber Hornification on the Fiber-Matrix Bonding Characteristics and Bending Behavior of Cement Based Composites

2014 ◽  
Vol 600 ◽  
pp. 421-432 ◽  
Author(s):  
Saulo Rocha Ferreira ◽  
Paulo Roberto Lopes Lima ◽  
Flávio Andrade Silva ◽  
Romildo Dias Toledo Filho
Keyword(s):  
Dimensional Stability ◽  
Sisal Fiber ◽  
Multiple Cracks ◽  
Direct Tension ◽  
Wetting And Drying ◽  
Pull Out ◽  
Higher Dimensional ◽  
Bending Loads ◽  
Fiber Matrix ◽  
Sisal Fibers

Cycles of wetting and drying can change the microstructure of vegetable fibers through a mechanism known as hornification, which modifies the polymeric structure of the fiber-cells resulting in a higher dimensional stability. In the present work the influence of hornification on the sisal fiber-matrix bond adhesion as well as in the sisal fiber dimensional stability and mechanical behaviour under direct tension was evaluated. Furthermore, cementitious composites reinforced with randomly dispersed hornified sisal fibers were developed and characterized under bending loads. The results show that the tensile strength and strain at failure of the hornified sisal fibers were increased by about 5% and 39%, respectively, whereas the modulus of elasticity was reduced by 9%. The fibers also presented higher dimensional stability with the hornification process. The fiber-matrix bonding was improved and the pull-out resistance of the fibers submitted to ten cycles of wetting and drying was increased by about 40% to 50%. The higher fiber-matrix bond strength contributed to an increase in the ductility and post-cracking behaviour of the composite. The fracture process was characterized by the formation of multiple cracks with the hornified sisal fibers presenting a higher ability to bridge and arrest the cracks.

Evaluation of Interfacial Properties of Sisal Fiber Reinforced High Density Polyethylene (HDPE) Composites

2007 ◽  
Vol 334-335 ◽  
pp. 625-628 ◽  
Author(s):  
Yan Li ◽  
Hong Xia Deng ◽  
Ye Hong Yu
Keyword(s):  
Natural Fiber ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Statistical Parameters ◽  
Pull Out ◽  
Bonding Properties ◽  
Fiber Surface Treatment ◽  
Sisal Fibers

Statistical methods were employed to study the structure characteristics of sisal fibers. Two types of fiber surface treatment methods, namely chemical bonding and oxidization were used to improve the interfacial bonding properties of sisal fiber reinforced HDPE (sisal/HDPE) composites. Interfacial properties were evaluated by single fiber pull out test. The interfacial shear strength (IFSS) was calculated and analyzed by the statistical parameters. The results were compared with those obtained by traditional ways. A novel method which could more accurately evaluate the interfacial properties between natural fiber and polymeric matrices was proposed.

Investigation on Effect of Varying Weight Percentage of Glass Fiber and Filler on the Properties of Glass Fiber-Cement- Polyester Composites

2020 ◽  
Vol 995 ◽  
pp. 117-122
Author(s):  
Phaneesh Shettigar ◽  
Manjunath Shettar ◽  
Rao U. Sathish ◽  
C.S. Suhas Kowshik ◽  
M.C. Gowrishankar
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Glass Fiber ◽  
Polyester Resin ◽  
Tensile Load ◽  
Weight Percentage ◽  
Pull Out ◽  
The Matrix ◽  
Polyester Composites

In this research, the results of different weight percentage of glass fiber (30, 40 & 50), cement (0, 3 & 6) and polyester resin (70, 60 & 50), on the properties of glass fiber-cement-polyester composites are investigated. The specimens are prepared by hand lay-up technique. All the specimens are tested for tensile and flexural strength as per ASTM standards. Results showed that escalation in glass fiber wt.% improved the tensile strength (by 9% at 40 wt.% and 17% at 50 wt.%) and flexural strength (by 10% at 40 wt.% and 16.5% at 50 wt.%). Whereas an increase in cement weight percentage decreases tensile strength and increases flexural strength. The failure of the sample is due to glass fiber pull out and rupture of the matrix, under tensile load.

Tensile and Statistical Analysis of Sisal Fibers for Natural Fiber Composite Manufacture

2015 ◽  
Vol 1115 ◽  
pp. 349-352 ◽  
Author(s):  
Md. Masudur R. Abir ◽  
S.M. Kashif ◽  
Md. Abdur Razzak
Keyword(s):  
Tensile Strength ◽  
Statistical Analysis ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Natural Fibers ◽  
Young Modulus ◽  
Gage Length ◽  
Sisal Fiber ◽  
Natural Fiber Composite ◽  
Sisal Fibers

To achieve sustainability in the composite industry, natural fibers must be able to replace synthetic fibers .In this work the tensile properties of sisal fibers were determined. The relationships between tensile strength, young modulus, failure to strain and gage length was studied. Also variation in tensile strength was quantified using statistical analysis. The relationship between Weibull statistics and gage length were also investigated. The strength of the sisal fiber obtained in this work was between 255-377 MPA and decreased with an increase in gage length. The Weibull modulus obtained was similar for all gage lengths and was around 2.5.

scholarly journals Bio-Based Polyurethane Composites and Hybrid Composites Containing a New Type of Bio-Polyol and Addition of Natural and Synthetic Fibers

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2028 ◽  
Author(s):  
Adam Olszewski ◽  
Paulina Kosmela ◽  
Aleksandra Mielewczyk-Gryń ◽  
Łukasz Piszczyk
Keyword(s):  
Hybrid Composites ◽  
Sem Analysis ◽  
Sisal Fiber ◽  
Synthetic Fibers ◽  
The Matrix ◽  
New Type ◽  
Liquefaction Process ◽  
Sisal Fibers ◽  
Polyurethane Composites ◽  
The Impact

This article describes how new bio-based polyol during the liquefaction process can be obtained. Selected polyol was tested in the production of polyurethane resins. Moreover, this research describes the process of manufacturing polyurethane materials and the impact of two different types of fibers—synthetic and natural (glass and sisal fibers)—on the properties of composites. The best properties were achieved at a reaction temperature of 150 °C and a time of 6 h. The hydroxyl number of bio-based polyol was 475 mg KOH/g. Composites were obtained by hot pressing for 15 min at 100 °C and under a pressure of 10 MPa. Conducted researches show the improvement of flexural strength, impact strength, hardness, an increase of storage modulus of obtained materials, and an increase of glass transition temperature of hard segments with an increasing amount of fibers. SEM analysis determined better adhesion of sisal fiber to the matrix and presence of cracks, holes, and voids inside the structure of composites.

scholarly journals Effect of Hybridization on the Mechanical Properties of Chopped Strand Mat/Pineapple Leaf Fibre Reinforced Polyester Composites

2018 ◽  
Vol 153 ◽  
pp. 01006 ◽  
Author(s):  
Suhas Yeshwant Nayak ◽  
Srinivas Shenoy Heckadka ◽  
Nishank Minil Amin ◽  
Ramakrishna Vikas Sadanand ◽  
Linto George Thomas
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Polymer Composites ◽  
Matrix Cracking ◽  
Reinforced Composites ◽  
Pull Out ◽  
The Matrix ◽  
Chopped Strand Mat ◽  
Hybrid Laminate

Hybridization of synthetic and natural fibres as reinforcement makes the polymer composites environmental friendly and sustainable when compared to synthetic fibres based polymer composites. In this study chopped strand mat/pineapple leaf fibres were hybridized. Four laminates with six layers each, with different stack sequence (GGGGGG, GPPPPG, PGGGGP and PPPPPP) were fabricated using hand layup technique while maintaining a fibre to matrix ratio of 30:70 by weight with polyester resin as matrix. Mechanical properties such as tensile and flexural strength were determined and morphology of fractured specimens was studied. Maximum tensile strength of 180 MPa was obtained for the laminate with six layers of chopped strand mat followed by hybrid laminate with four layers of chopped strand mat at the centre (120 MPa). Tensile strength of hybrid laminate with four layers of pineapple leaf fibres at the centre was in third position at 86 MPa. Least tensile strength of 65 MPa was obtained for the laminate with six layers of pineapple leaf fibres. Similar trend was observed in case of flexural behaviour of the laminates with maximum flexural strength of 255 MPa and minimum flexural strength 107 MPa. Scanning electron microscopy of the fractured specimen reinforced with chopped strand mat only, indicated, fibre pull out, matrix cracking and lack of matrix adhesion to fibres. In case of hybrid composite (GPPPPG and PGGGGP) delamination was observed to be prominent due to improper wetting of the pineapple leaf fibres with the matrix. More significant delamination led to lesser strength in case of pineapple fibres reinforced composites even though the fibre pull out was relatively less.

Mechanical Behavior of Self-Compacting Soil-Cement-Sisal Fiber Composites

2014 ◽  
Vol 634 ◽  
pp. 421-432 ◽  
Author(s):  
A.P.S. Martins ◽  
F.A. Silva ◽  
R.D. Toledo Filho
Keyword(s):  
Raw Materials ◽  
Low Cost ◽  
Sisal Fiber ◽  
Fracture Mechanisms ◽  
Residual Soil ◽  
Cement Composites ◽  
Uniaxial Compression Strength ◽  
Soil Cement ◽  
The Matrix ◽  
Sisal Fibers

The aim of this research is the development and mechanical characterization of self-compacting soil cement composites with the incorporation of fly ash, metakaolin and sisal fibers. The mentioned composites, based on natural raw materials (raw earth and vegetable fibers), which are abundant in nature and have low cost and low environmental impact could be used as a more sustainable alternative than conventional industrialized materials for applications that don ́t require high structural performance (minimum strength equals to 2 MPa). A residual soil, constituted by 35% of fines and 65% of granular material was selected and the matrix was designed using a computational routine, based on the compressible packing model (CPM). The rheology of the matrix was adjusted by the slump flow test having as a target the spreading value of 600 mm. The matrix presented uniaxial compression strength of about 3.3 MPa after 28 days of curing. After 240 days of curing it was noticed an increase in the compressive strength to 7.5 MPa. This can be traced back to the pozzolanic reactions that takes place in the system. The soil cement composites were produced with three different sisal fiber contents: 0.5, 1.0 and 1.5% (in relation to the weight of dry soil) and a fiber length (Le) of 20 mm. Under compression, the incorporation of fibers has significantly influenced the post-peak behavior, increasing the toughness and the strain capacity. Under four point bending loading, the presence of fibers have contributed to increase the peak strength and the residual strength with expressive gains of toughness. The composites presented strength values as high as 1.8 MPa (1.0% of fibers) when they were subjected to bending loads. The use of sisal fibers as reinforcement modified the fracture mechanisms of the composites, changing it from a brittle to a ductile behavior.

scholarly journals Analisis Pengaruh Konsentrasi Natrium Hidroksida terhadap Sifat Mekanik Biokomposit Berpenguat Serat Sisal

Jurnal Fisika ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 11-18
Author(s):  
Amirin Kusmiran ◽  
Rita Desiasni
Keyword(s):  
Mechanical Properties ◽  
Sodium Hydroxide ◽  
Interfacial Adhesion ◽  
Alkali Treatment ◽  
Natural Fibers ◽  
Sisal Fiber ◽  
Adhesion Properties ◽  
The Matrix ◽  
Sisal Fibers ◽  
Sodium Hydroxide Treatment

The mechanical properties of natural fibers are continuous development as the alternatively synthetic fibers because of the natural fibers are non-corrosive, lightweight, and environmental advantages. However, these fibers have poor interfacial adhesion properties as the fibers if used as bio-composite material. This problem can be solved by the surface modification method by the sodium hydroxide treatment used to improve the mechanical properties. A sodium hydroxide concentration which it used at 0 wt%, 5 wt%, 10 wt%, and 15 wt% and the sisal fibers were soaked in that a concentration for 2 hours. Furthermore, the bio-composite fabrication is conducted by hand lay-up technique which is using both sisals as the fibers and epoxy resin as the matrix. The tensile test RTG-1250 results show that the maximum mechanical properties, such as strains, Young's modulus, and elongation, was obtained at sodium hydroxide 5 wt% than others where the values of these mechanical properties were 25.334 MPa, 16.111 GPa, and 1.572%, respectively. The morphological evaluation carried out using a scanning electron microscope showed that the alkali sodium hydroxide treatment was improved interfacial adhesion between fiber and matrix. Finally, sodium hydroxide alkali treatment of more than 5% can be able to sisal fiber cracks so that the mechanical properties of bio-composite can decrease continuously.

scholarly journals Influence of Sisal Fibers on the Properties of Rammed Earth

2019 ◽  
Vol 8 (9S2) ◽  
pp. 663-667
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Bond Strength ◽  
Strength Properties ◽  
Coarse Sand ◽  
Sisal Fiber ◽  
Rammed Earth ◽  
Pull Out ◽  
Earth Blocks ◽  
Sisal Fibers

The use of rammed earth has been increasing widely during recent years in many countries as an alternative material for building houses due to its valuable characteristics such as affordability, environment friendly, comfort, strength and durability. This thesis presents the result of an experimental study to evaluate the compressive strength and bond strength properties of untreated, treated bamboo splints and steel reinforced cement stabilized rammed earth blocks. To overcome the deficiencies of blocks, sisal fibers are added to improve the performance of CSRE blocks. Fibers are secondary reinforced materials and acts as crack arresters which improves the strength of cement stabilized rammed earth blocks. In this experimental study, red soil is mixed by adding four different percentages (5%, 10%, 15%, and 20%) of OPC and sisal fiber with 0.2%, 0.4%, 0.6%, 0.8%, and 1.0% by weight of soil respectively. The bamboo splints were treated by soaking them in chemical solution of boric acid, Copper -Sulphate and Potassium Di-chromate (1.5:3:4).The resin-based adhesive with coarse sand will be applied to the top of bamboo splints. After 28days of curing period the cubes were tested for compressive strength, pull-out test is done for a series of CSRE blocks in which Bamboo splints and steel bars are embedded to find out its bond strength.

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