Chemically and Thermally Treated Vegetable Fibers for Reinforcement of Cement-Based Composites

Arsène, Marie-Ange; Okwo, A.; Bilba, Ketty; Soboyejo, Alfred; Soboyejo, Winston O.

doi:10.1080/10426910601063386

Cited by 73 publications

(52 citation statements)

References 47 publications

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“…0 37·87 37·87 32·77 32·27 43·52 43·52 30·17 30·17 2 54·71 52·64 46·09 43·54 61·78 59·02 44·73 43·65 4 64·29 55·93 51·27 54·40 73·67 66·87 55·13 52·83 6 78·61 70·37 76·16 60·61 79·81 73·23 65·29 65·88 Ternary and CLA identify the matrix; B for untreated fibers and P for pyrolyzed fibers Adding fibers leads to reduced bending strengths of the composites for both matrices, whatever the age and the fiber pretreatment. This behavior has already been observed by Arsène et al 11 in the case of composites prepared with chemically treated (sulfuric acid 5% by mass) bagasse fibers, and they attributed this to the lack of adhesion between the fibers and the matrix and a different void entrapment due to the fiber treatment. In addition, the composite pads were pressed at 0·5 MPa, which is six to ten times lower than the pressure proposed by Savastano et al, 13 leading to the presence of more porosity.…”

Section: Specific Heatsupporting

confidence: 50%

“…In CLA composites, the optimal amounts of fibers leading to high strengths are around 2-4% by mass for raw fibers, while for pyrolyzed fibers, the optimal content is noted for 2 wt%. Arsène 11 have already observed this optimal content for pyrolyzed fibers in a commercial matrix. In the ternary matrix, the decrease in the bending strength is observed for increasing amounts of pyrolyzed fibers; this maybe due to low fiber/matrix adhesion; in this case, crack propagation is faster.…”

Section: Specific Heatmentioning

confidence: 99%

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Thermal and flexural properties of bagasse/cement composites

et al. 2015

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Enhancing the sustainability, circular economy and use of by-products and renewable resources concerns a great number of researchers. Adding value to tropical vegetable resources and proposing a replacement for asbestos are challenges for chemists. Sugar cane bagasse is evaluated both as a mineral replacement and as a reinforcement in cementitious paste. In this matrix, ordinary Portland cement is partly replaced by natural pozzolan and bagasse ashes; a ternary binder is obtained. The pastes reinforced with vegetable fibers are prepared by the incorporation of untreated and pyrolyzed bagasse fibers (2-6 wt%) in this modified matrix. The thermal conductivity and the bending strength of the composite pastes, placed in various environments (curing chamber and water), are evaluated and compared to those of composite pastes made with commercial cement and bagasse fibers, exposed to identical aging conditions. The more relevant results are obtained in the curing chamber: the composite pastes prepared with the ternary matrix conduct less heat than the commercial binder composites at 28 d, and better bending strengths are obtained with the ternary binder composites at 28 and 90 d, particularly with the untreated bagasse fibers. . IntroductionGuadeloupe is a French Caribbean island with a tropical climate (latitude 16°59¢45″ north, longitude 62°04¢03″ west) and where seismicity is high and hurricanes occur frequently, so the choice of construction materials takes an essential place in structure design. As the durability of construction materials is strongly related to the exposure conditions, metallic structure degradation by corrosion is one of the preoccupations of researchers.As shown by various authors, 1-3 a way to prevent structure corrosion is the use of pozzolanic materials during the preparation of pastes, mortars or concretes. These silico-aluminous materials, when they are finely crushed, 4 react with the calcium hydroxide (Ca(OH) 2 ) released during cement hydration, to form products of the same chemical nature as the hydration products of cement. In Guadeloupe, cement is widely used for construction. A way to prevent the corrosion of steel framework in concrete is the partial replacement of cement by natural local pozzolan or ashes prepared from agro-industrial by-products. As indicated by Malhotra and Metha, 5 using pozzolanic materials coming from vegetable, mineral or agro-industrial by-products leads to (a) mechanical and physical-chemical benefits: improved mechanical strength, low permeability and strength against aggressive chemicals and thermal cracking; (b) economic benefits: reduced cost of buildings with the replacement of 20-60% by mass of cement by pozzolanic materials; and (c) ecological benefits: reduction of greenhouse gas (GHG) emission because of the partial replacement of cement in concrete and contribution to sustainability.Moreover, French thermal and acoustic regulations 6 expect autosufficiency and use of 50% renewable power in energy consumption by 2020. These regulations are essentia...

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Section: Specific Heatsupporting

confidence: 50%

Section: Specific Heatmentioning

confidence: 99%

Thermal and flexural properties of bagasse/cement composites

et al. 2015

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“…La cás-cara está formada aproximadamente por 95% de materia orgánica y 5% de minerales presentes en las cenizas (generalmente Si, Ca, Mg, K, Al, P, S, Cl). La bibliografía muestra que la composición química de la cáscara de maní está formada principalmente por celulosa, lignina y hemicelulosa (8). Contiene además otros polisacáridos, lípidos, proteínas, minerales, azúcares libres, resinas (Tabla 6).…”

Section: Agregado: Cáscaras De Maníunclassified

Materiales compuestos de cáscaras de maní y cemento. Influencia de diferentes tratamientos químicos sobre las propiedades mecánicas

Gatani¹,

Arguello²,

Sesín³

2010

Mater. construcc.

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Palabras clave: materiales con cáscaras de maní, uso de residuos agroindustriales, materiales compuestos de cáscaras de maní y cemento, material de bajo costo, propiedades mecánicas. SUMMARYAn abundance of agri-food waste in the area around Cordoba, Argentina, has driven the development of new construction materials. This study explored the applicability of peanut shells as additions in cement blends and the suitability of the properties of the resulting mixes for use in construction materials.The mechanical properties of the specimens were observed to improve when the shells were previously treated with quicklime (CaO) or when sodium silicate and aluminium sulfate were added to the blend.While the resulting materials did not exhibit the same mechanical properties as traditional mortars and concretes, they do appear to be apt for use in lightweight and non-bearing structures.K Ke ey yw wo or rd ds s: : materials containing peanut shells, use of agri-food waste, peanut shell and cement materials, lowcost materials, mechanical properties.(

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“…Fengel and Wegener (1983) have reported that the different alkali solution (KOH, Ca(OH) 2 , NaOH) and its concentration have an effect on the degree of swelling and in the transformation into cellulose-II which affects the quality of the fibers. Also, author researchers reported that treatment with Ca(OH) 2 decreased the tenacity of fibers more than treatment with NaOH (Arsene et al, 2007). The treatment with sodium hydroxide changes the topography of the surface of the fibers, removing the components of the cuticle, the pectin, and partially the lignin and the hemicelluloses (Mwaikambo et al, 1999).…”

Section: Effect Of the Concentration Of Naohmentioning

confidence: 99%

Extraction and characterization of Retama monosperma fibers

Eddine¹,

Meriem²

2015

Afr. J. Biotechnol.

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The aims of this study were to determine the good conditions for fibers extraction from Retama monosperma young stems and their mechanical, physical and chemical characteristics. The fibers were extracted using a range of NaOH concentration from 1 to 16% in a period of treatment of 1 to 24 h, coupled with a physical treatment. For the evaluation of physico-mechanical characteristics, 200 samples were performed in the tensile test. The biochemical composition of the fibers was determined after separation of the parietal compounds. The results show that the best fiber yield was 11.51% obtained by a treatment of 14% NaOH for 8 h, followed by a physical treatment. The fibers biocomposition was 87.3% of cellulose, 7.5% of hemicelluloses and 1% of lignin. The Young's modulus was 13.3 GPa, tensile strength was 110 MPa and a density was 1.3 g/cm 3 . The average fiber length was 155.7 mm. The fibers yield and characteristics showed that R. monosperma plant may in future be suitable source for natural fibers.

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Chemically and Thermally Treated Vegetable Fibers for Reinforcement of Cement-Based Composites

Cited by 73 publications

References 47 publications

Thermal and flexural properties of bagasse/cement composites

Thermal and flexural properties of bagasse/cement composites

Materiales compuestos de cáscaras de maní y cemento. Influencia de diferentes tratamientos químicos sobre las propiedades mecánicas

Extraction and characterization of Retama monosperma fibers

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