Home / Journals / JRM / Vol.8, No.2, 2020
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  • Open Access

    ARTICLE

    Experimental Research on Structural Behaviors of Glulam I-Beam with a Special-Shaped Section

    Ruyuan Yang1, Chaokun Hong2, Xiaofeng Zhang1, Quan Yuan3, Youfu Sun1,*
    Journal of Renewable Materials, Vol.8, No.2, pp. 113-132, 2020, DOI:10.32604/jrm.2020.08190
    (This article belongs to this Special Issue: Bio-composite Materials and Structures)
    Abstract In order to enhance the bearing capacity of structural components, save materials, and reduce cost, a glued laminated timber (glulam) I-beam that is theoretically suitable for engineering application was proposed. In this study, 18 glulam specimens were fabricated using larch dimension lumber and resorcinol– formaldehyde resin. Four-point bending tests were carried out to compare the ultimate bearing capacity, strain, and deflection of various specimens. The results showed that: (1) The typical failure mode at bending is the web shear failure parallel to grain. Before the failure, cracks and sounds appear at the beam web, which represent the sudden brittle failure.… More >

  • Open Access

    ARTICLE

    Self-Supported Nanoporous Gold with Gradient Tin Oxide for Sustainable and Efficient Hydrogen Evolution in Neutral Media

    Xianglong Lu1, Tianshui Yu1, Hailing Wang1, Ruichun Luo2, Pan Liu2, Songliu Yuan1, Lihua Qian1,*
    Journal of Renewable Materials, Vol.8, No.2, pp. 133-151, 2020, DOI:10.32604/jrm.2020.08650
    Abstract Hydrogen evolution reaction (HER) in neutral medium suffers from slow kinetics as compared to that in alkaline or acidic conditions, owing to larger Ohmic loss and low proton concentration. Here we report that a self-supported nanoporous Au-SnOx (NP Au-SnOx) catalyst with gradient tin oxide surface could significantly enhance HER activity in neutral buffer solution (0.2 M PBS). The NP Au-SnOx catalyst exhibits a low onset overpotential of 38 mV and a small Tafel slope of 79 mV dec−1 . The current density of 10 mA cm−2 is manifested at an overpotential as low as 148 mV, representing the comparable performance… More >

  • Open Access

    ARTICLE

    Experimental Study of Waste Tire Rubber, Wood-Plastic Particles and Shale Ceramsite on the Performance of Self-Compacting Concrete

    Lei Tian, Liuchao Qiu*, Jingjun Li, Yongsen Yang
    Journal of Renewable Materials, Vol.8, No.2, pp. 154-170, 2020, DOI:10.32604/jrm.2020.08701
    (This article belongs to this Special Issue: Renewable materials for sustainable development)
    Abstract In recent decades, the utilization of waste tires, plastic and artificial shale ceramsite as alternative fine aggregate to make self-compacting concrete (SCC) has been recognized as an eco-friendly and sustainable method to manufacture renewable construction materials. In this study, three kinds of recycled aggregates: recycled tire rubber particles, wood-plastic particles, artificial shale ceramsite were used to replace the sand by different volume (5%, 10%, 20% and 30%), and their effects on the fresh and hardened properties of SCC were investigated. The slump flow and V-funnel tests were conducted to evaluate the fresh properties of modified-SCC mixtures. The hardened properties include… More >

  • Open Access

    ARTICLE

    Mycogenic Silver Nanoparticles From Endophytic Trichoderma atroviride with Antimicrobial Activity

    Ahmed Abdel-Azeem1,*, Amr A. Nada2,3, Anthonia O’Donovan4, Vijay Kumar Thakur5, Amr Elkelish6
    Journal of Renewable Materials, Vol.8, No.2, pp. 171-185, 2020, DOI:10.32604/jrm.2020.08960
    (This article belongs to this Special Issue: Polymer and Nanomaterials)
    Abstract There is an increasing interest in developing nanoparticles with diverse biologic activities. To this end, we prepared 10 to 15 nm silver nanoparticles (AgNP) from native isolates of Trichoderma atroviride. Within this study, endophytic fungi hosted four medicinal plants in Saint Katherine Protectorate, South Sinai, Egypt have been isolated by surface sterilization technique on four isolation media. Ten species, based on their frequency of occurrence, out of twenty recovered taxa were tested for their capability to synthesize extracellular AgNPs. Trichoderma atroviride hosted Chiliadenus montanus was found to be the best candidate for the production of mycogenic AgNPs among all examined… More >

  • Open Access

    ARTICLE

    Isolation of Thermally Stable Cellulose Nanocrystals from Spent Coffee Grounds via Phosphoric Acid Hydrolysis

    Brody A. Frost, E. Johan Foster*
    Journal of Renewable Materials, Vol.8, No.2, pp. 187-203, 2020, DOI:10.32604/jrm.2020.07940
    (This article belongs to this Special Issue: Renewable Polymer Materials and Their Application)
    Abstract As the world's population exponentially grows, so does the need for the production of food, with cereal production growing annually from an estimated 1.0 billion to 2.5 billion tons within the last few decades. This rapid growth in food production results in an ever increasing amount of agricultural wastes, of which already occupies nearly 50% of the total landfill area. For example, is the billions of dry tons of cellulose-containing spent coffee grounds disposed in landfills annually. This paper seeks to provide a method for isolating cellulose nanocrystals (CNCs) from spent coffee grounds, in order to recycle and utilize the… More >

  • Open Access

    ARTICLE

    Orientation on the Mechanistics of Electron-Transfer on Oxidation of Chondroitin-4-Sulfate as Sustainable Sulfated Polysaccharide by Permanganate Ion in Aqueous Perchlorate Solutions

    Refat Hassan1,*, Hideo Takagi2, Samia Ibrahim3
    Journal of Renewable Materials, Vol.8, No.2, pp. 205-218, 2020, DOI:10.32604/jrm.2020.08530
    (This article belongs to this Special Issue: Polymer and Nanomaterials)
    Abstract A spectrophotometric investigation of oxidation of chondroitin-4-sulfate (CS) as a sustainable and biodegradable sulfated macromolecule by oxyanion permanganate ion as multi-equivalent oxidant in acid perchlorate solutions at a constant ionic strength of 2.0 mol dm-3 has been studied. The experimental results on the influence of the concentration of the reactants the reaction rates revealed first-order dependence in MnO4 , fractional second-order in [CS] and fractional first-order with respect to the hydrogen ion concentration. The hydrogen acid concentration dependence of the rate constants indicated that the oxidation rates were increased with increasing the acid concentration which means that the oxidation reaction… More >

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