Journals / JRM / Vol.7, No.6


    Feasibility of Using Wood Chips to Regulate Relative Humidity Inside a Building: A Numerical Study

    Dimitri Bigot1,*, Cyril Ott1, Stéphane Guichard1, Bruno Malet-Damour1
    Journal of Renewable Materials, Vol.7, No.6, pp. 505-516, 2019, DOI:10.32604/jrm.2019.04019
    Abstract The use of bio-based materials in buildings has become more and more significant last years. In most of the cases, their health properties and natural provenance have made them a great solution to face global climate warming and the new policies to reduce building energy consumption. In many thermal problems, bio-based materials can allow to optimize the building thermal behavior according to its energy consumption and inside comfort conditions. So it is when they are used as an insulation material in the building. However, it is not the case in this paper. In fact, the bio-based matter is rather used… More >


    Extraction and Characterization of Aucoumea klaineana Pierre (Okoume) Extractives

    Engozogho Anris Starlin Peguy1,2, Bikoro Bi Athomo Arsene1,2, Vidal Marcia5, Denaud Louis4, Safou Tchiama Rodrigue2,3, Charrier Bertrand1
    Journal of Renewable Materials, Vol.7, No.6, pp. 517-522, 2019, DOI:10.32604/jrm.2019.04051
    Abstract In order to promote convenient strategies for the utilization of wood wastes from aucoumea klaineana pierre (okoume) timber industry, various chemical analysis were carried out on samples from different origins. Total extractives content of the bark, sapwood and heartwood of okoume were evaluated. thermogravimetric analyses were performed and the stiasny number was calculated. it was found that the bark was richer in fatty acid of high molecular weight while the sapwood was rich in fatty acid of low molecular weight. the condensed tannins content varied according to the origin and the part of the tree. these new findings should be… More >


    Biodegradable Additive for the Construction Industry

    Juan Carlos Torres Lozada*
    Journal of Renewable Materials, Vol.7, No.6, pp. 523-525, 2019, DOI:10.32604/jrm.2019.04053
    Abstract This paper presents the patent of a new additive for the construction industry, which is obtained from the biomass residues of the wood industry. This additive is biodegradable and has fluidifying, foaming, plasticizing and stabilizing properties. When the additive is mixed with cement binder compositions, cement mortar and concrete, lightweight, flame-retardant cellular materials, thermal and acoustic insulators are obtained. More >


    Liquefaction of Kraft Lignin at Atmospheric Pressure

    Silvia Helena Fuentes da Silva1, Patricia Soares Bilhalva dos Santos2, Darci Alberto Gatto3, Maria Angeles Andres1, Itziar Egüés1,*
    Journal of Renewable Materials, Vol.7, No.6, pp. 527-534, 2019, DOI:10.32604/jrm.2019.04291
    Abstract Kraft lignin was liquefied using polyethylene glycol #400 (PEG) and glycerol (G) in a weight ratio of 80/20 (w/w) and sulphuric acid (SA) as catalyst under atmospheric pressure at 160ºC. The three independent variables: reaction time (60, 80 and 100 min), percentage of lignin (15, 20 and 25%, w/w), and catalyst concentration (0, 3 and 6%, w/w), were varied resulting in 27 experimental runs. The effect of these reaction conditions on the properties of the polyols was evaluated. The statistical analysis showed that only “the percentage of lignin” did not influence the properties of the liquefied products, however, reaction time… More >


    Prediction of Thermal Conductivity and Specific Heat of Native Maize Starch and Comparison with HMT Treated Starch

    Aklouche Leila1, Monteau Jean-Yves2, Rezzoug Sid-Ahmed1, Maugard Thierry3, Guihard Luc2, Cohendoz Stephane1, Maache-Rezzoug Zoulikha1,*
    Journal of Renewable Materials, Vol.7, No.6, pp. 535-546, 2019, DOI:10.32604/jrm.2019.04361
    Abstract Specific heat (Cp) and effective thermal conductivity (λ) of native maize starch (NS) were measured by DSC and transient heat transfer method, respectively, at different moisture contents and temperatures. The dependency of temperature (T) and moisture content (W) on the two parameters were investigated. The thermophysical properties of treated starch (TS) by four hydrothermal processes (RP-HMT, IV-HMT, DV-HMT and FV-HMT) were measured and compared to native strach. Hydrothermal treatments were performed at 3 bars (133°C) for 10 min. For Cp and λ measurements, moisture content varied for NS from 5 to 21.5% d.b. and from 8.8 to 25% d.b., respectively,… More >


    Modeling Water Adsorption and Retention of Building Materials From Pore Size Distribution

    Abdelkrim Trabelsi1,*, Zakaria Slimani1, Akli Younsi2, Joseph Virgone1, Rafik Belarbi2
    Journal of Renewable Materials, Vol.7, No.6, pp. 547-556, 2019, DOI:10.32604/jrm.2019.04426
    Abstract Water adsorption and capillarity are key phenomena involved during heat and moisture transfer in porous building materials. They account for interaction between solid matrix, liquid water and moist air. They are considered through Water Vapor Adsorption Isotherm (WVAI) and Retention Curve (RC) functions which are constitutive laws characterizing water activity within a porous medium. The objective of this paper is to present a water vapor adsorption and retention models built from multimodal Pore Size Distribution Function (PSDF) and to see how its parameters modify moisture storage for hygroscopic and near saturation ranges. The microstructure of the porous medium is represented… More >


    Characterization and Influence of Nanofiber Flours of Wood Modified on Fresh State Properties of Cement Based Mortars

    Fadhel Aloulou1,*, Sabrine Alila2
    Journal of Renewable Materials, Vol.7, No.6, pp. 557-566, 2019, DOI:10.32604/jrm.2019.00141
    Abstract Nanofibrillated wood fiber was used as fillers in the partial cement matrix replacing the cement to a content of up to 2% by weight of cement. The nanofibrillated effect of wood fibers on porosity, thermal properties and compressive strength was studied. The results obtained showed an improvement in compressive strength of more than 40% with 1% by weight of wood fiber nanofibrillate. The addition of nanofibrillated wood fiber shows a good pore reduction, and the best result was obtained with emulsion of a mixture incorporating 1% by weight of wood fiber nanofibrillate in the presence of an anionic surfactant (SDBS).… More >


    Chitosan/Nanocrystalline Cellulose Biocomposites Based on Date Palm (Phoenix Dactylifera L.) Sheath Fibers

    Abeer M. Adel1, Amira M. El-Shafei2, Atef A. Ibrahim1, Mona T. Al-Shemy1,*
    Journal of Renewable Materials, Vol.7, No.6, pp. 567-582, 2019, DOI:10.32604/jrm.2019.00034
    Abstract In this study, nanocrystalline celluloses were used to enhance physical, mechanical and water vapor barrier properties of chitosan films for potential food packaging applications. Two different mineral acids (sulfuric and phosphoric) were used to extract nanocrystalline cellulose from date palm sheath fibers. The influence of cellulose I and cellulose II on the properties of the isolated nanocrystalline celluloses (e.g., yield, energy and length of intra- and intermolecular hydrogen bonds, and degree of substitution) were studied too. The characteristics of chitosan biocomposite film with phosphorylated nanocrystalline cellulose were compared to those with sulfated nanocrystalline cellulose. Results showed that besides cellulose polymorphism,… More >

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