scholarly journals Micro-structure and mechanical properties of microcrystalline cellulose-sisal fiber reinforced cementitious composites developed using cetyltrimethylammonium bromide as the dispersing agent

Cellulose ◽  
2021 ◽  
Vol 28 (3) ◽  
pp. 1663-1686
Author(s):  
Aloysio Souza Filho ◽  
Shama Parveen ◽  
Sohel Rana ◽  
Romel Vanderlei ◽  
Raul Fangueiro
Keyword(s):  
Microcrystalline Cellulose ◽  
Cetyltrimethylammonium Bromide ◽  
Sisal Fiber ◽  
Cementitious Composites ◽  
Ctab Concentration ◽  
Dispersing Agent ◽  
Hierarchical Composites ◽  
Compressive And Flexural Strengths ◽  
Sisal Fibers ◽  
Hybrid Reinforcement

AbstractThis paper reports new hierarchical cementitious composites developed using microcrystalline cellulose (MCC), sisal fibers and cetyltrimethylammonium bromide (CTAB) as the dispersing agent. MCC was dispersed in water without and with CTAB at different concentrations using ultrasonication and the optimum CTAB concentration for achieving homogeneous and stable MCC suspensions was found to be 40%. Hierarchical composites were fabricated using MCC (0.1–1.5 wt% of cement), sisal fibers (20 mm, 0.25% and 0.50 wt% of cement), 40% CTAB and tri-butyl phosphate as the defoaming agent. Mechanical strengths of composites improved significantly at 0.1 wt% MCC, which along with 0.5% sisal fibers improved compressive and flexural strengths by ~ 24% and ~ 18%, respectively. The hybrid reinforcement exhibited a synergistic effect on the fracture behavior of composites improving the fracture energy up to 40%. Hierarchical composites also showed improved fiber-matrix bonding, lower porosity and water absorption, superior hydration, carbonation resistance and durability up to 90 ageing cycles.

Novel Multi-Scale Cementitious Composites Developed Using Microcrystalline Cellulose (MCC) and Sisal Fibers

2019 ◽  
Vol 812 ◽  
pp. 100-106
Author(s):  
Aloysio Gomes de Souza Filho ◽  
Shama Parveen ◽  
Sohel Rana ◽  
Romel Dias Vanderlei ◽  
Raul Fangueiro
Keyword(s):  
Microcrystalline Cellulose ◽  
Cementitious Composites ◽  
Multi Scale ◽  
Sisal Fibers

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.

scholarly journals Sisal fiber as an alternative to the construction of flexible fiber filters applied to water treatment

2019 ◽  
Vol 9 (4) ◽  
pp. 608-615
Author(s):  
Alice K. M. Morita ◽  
Marco A. P. Reali
Keyword(s):  
Low Income ◽  
Aluminum Sulfate ◽  
Natural Fibers ◽  
Low Income Countries ◽  
Sisal Fiber ◽  
Internal Diameter ◽  
Flexible Fiber ◽  
Filtration System ◽  
Polyamide Fibers ◽  
Sisal Fibers

Abstract The recently developed flexible fiber filters (3Fs) are modular filtration units, which can satisfactorily remove solids at high filtration rates. Normally built with polyamide fibers, it is supposed that natural fibers can be used alternatively. This paper evaluated the performance of 3Fs using as filtering media sisal fibers in lieu of the polyamide ones. The sisal fibers were evaluated by means of scanning electronic microscopy and through solubility assays in hydrochloric acid and sodium hydroxide. Six filters with 28 mm of internal diameter were built, varying their length (25, 60, and 100 cm) and porosity (85 and 93%). The filtration system was fed with synthetic water, in-line coagulation was applied by the addition of 22.5 mg/L of aluminum sulfate, and filtration rates from 20 to 80 m/h were evaluated. Only the filter with 100 cm of length and 85% of porosity could work within the limit established (1 NTU), operating at 20 and 40 m/h. For all the studied configurations, the pressure drop was considerably low (less than 0.5 mH2O) when compared with 3Fs built with polyamide, which shows the potential of using this kind of filter as pre-filtration units or for less restrictive uses. This study showed that 3Fs can be adapted to include different configurations and materials, reducing their cost and making them appropriate for low-income countries.

Tailored smart bioactive glass nanoassembly for dual antibiotic in vitro sustained release against osteomyelitis

2016 ◽  
Vol 4 (47) ◽  
pp. 7605-7619 ◽  
Author(s):  
Nidhi Gupta ◽  
Deenan Santhiya ◽  
Anusha Aditya
Keyword(s):  
Sustained Release ◽  
Bioactive Glass ◽  
Cetyltrimethylammonium Bromide ◽  
Sacrificial Template ◽  
Ctab Concentration

The effect of cetyltrimethylammonium bromide (CTAB) concentration as a sacrificial template on tunable mesostructure textured bioactive glass nanoparticles has been explored and characterized for osteomyelitis applications.

Development of Nano Modified Eco-Friendly Green Binders for Sustainable Construction Applications

2019 ◽  
Vol 24 ◽  
pp. 25-36 ◽  
Author(s):  
Hamada Shoukry
Keyword(s):  
Water Absorption ◽  
Mechanical Performance ◽  
Raw Material ◽  
Sustainable Construction ◽  
Partial Replacement ◽  
Cementitious Composites ◽  
Water Absorption Coefficient ◽  
Compressive And Flexural Strengths ◽  
Cement Manufacturing

Cement manufacturing, which is partially responsible for environmental and health risks as well as the greenhouse gas emissions, is a binder industry that needs energy and raw material. To decrease the needing, this study develops nano-modified eco-friendly cementitious composites including industrial solid wastes and/or by-products. For this purpose, ordinary Portland cement (OPC) was partially replaced with 70 wt% of fly ash (FA), Nano metakaolin (NMK) was incorporated at a rate of 2, 4, 6, 8, 10, 12 and 14 % as partial replacement by weight of FA to take advantage of the great role of nano materials in improving the mechanical and physical properties of cement based materials. Compressive strength, flexural strength, and capillary water absorption coefficient have been studied at 28 days of curing according to the international ASTM standards. Differential scanning calorimeter (DSC) was used to study the phase composition/decomposition. The microstructure characteristics of the hardened samples were investigated by scanning electron microscope (SEM) equipped with energy dispersive analytical x-ray unit (EDAX). The results revealed that the partial replacement of cement by 70% of FA has reduced both compressive and flexural strengths by about 45% in addition; the water absorption has been increased by about 175% as compared to the OPC. The replacement of FA by different amounts of NMK compensate for the loss in strength by about 75%. Furthermore, NMK has considerably improved the microstructure and reduced the water absorption by 86%. The study concluded that, it is possible to substitute 70% of the weight of the cement in the production of eco-friendly cementitious composites with improved mechanical performance attaining 88% of the corresponding performance of the hydrated OPC. The developed composites can be considered as green binders and recommended for various applications in construction industry.

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.

Study on the Bio-Composite from Sisal Fiber Reinforced Cellulose Acetate

2012 ◽  
Vol 535-537 ◽  
pp. 2301-2306 ◽  
Author(s):  
Ai Ju Jiang ◽  
Xiao Qiang Xu ◽  
Hong Wu Wu
Keyword(s):  
Cellulose Acetate ◽  
Interfacial Adhesion ◽  
Sisal Fiber ◽  
Initial Length ◽  
Hot Press ◽  
Biodegradation Rate ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Sisal Fibers

In this paper, sisal fibers (SF) reinforced cellulose acetate composites were prepared using twin-screw extrusion followed by hot-press moulding technology. Both the mechanical properties and the biodegradable rate of the composite were investigated in terms of effect of initial length and mass content percentage of sisal fiber on. The results showed that the fibers tended to be shorter and thinner during the processing of twin-screw blending and the tensile and flexure strength of composites were enhanced, with the content or initial length of sisal fibers increasing. Furthermore, the biodegradation rate of the composite was forward at first, and gradually became slow in later period and then leveled off finally. In addition, Micro-morphologies of the fracture surface of the composite were visualized by scanning electron microscopy (SEM) to analyze the effect of initial length and content of sisal fibers on interfacial adhesion and the distribution of sisal fibers in the composites.

Effect of Heat Treated Sisal Fiber on Physical Properties of Polypropylene Composites

2010 ◽  
Vol 123-125 ◽  
pp. 1123-1126 ◽  
Author(s):  
Sulawan Kaewkuk ◽  
Wimonlak Sutapun ◽  
Kasama Jarukumjorn
Keyword(s):  
Atmospheric Pressure ◽  
Mechanical Tests ◽  
Sisal Fiber ◽  
Molding Machine ◽  
Polypropylene Composite ◽  
Polypropylene Composites ◽  
Heat Treated ◽  
Effect Of Treatment ◽  
Sisal Fibers ◽  
Internal Mixer

Sisal fiber reinforced polypropylene composites were prepared using an internal mixer. Heat treatred sisal fibers were performed by heating the fibers in an oven at 150, 170, and 200°C under an atmospheric pressure and a presence of air. The composites prepared at a fiber content of 20 wt% were molded by an injection molding machine for mechanical tests including tensile and impact properties. Morphologies of the composites were examined using a scanning electron microscope (SEM). Viscosity at various shear rate of the composites were also investigated. Tensile strength and impact strength of heat treated sisal fiber/polypropylene composites were slightly higher than that of the untreated sisal fiber/polypropylene composite. However, no remakable effect of treatment temperatures on the mechanical and rheological properties of the composites was observed. SEM micrographs revealed that the heat treatment improved adhsion between the fiber and PP matrix.

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