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  • Open Access


    A Primary Study on Mechanical Properties of Heat-Treated Wood via in-situ Synthesis of Calcium Carbonate

    Dianen Liang1, Zhenhao Ding1, Qilin Yan1, Redžo Hasanagić2, Leila Fathi3, Zi Yang1, Longhao Li1, Jianbo Wang1, Houhua Luo1, Qian Wang1, Demiao Chu1,*

    Journal of Renewable Materials, Vol.11, No.1, pp. 435-451, 2023, DOI:10.32604/jrm.2022.023214

    Abstract This study aims to improve the value of fast-growing wood and extend the heat-treated wood utilization using inorganic calcium carbonate (CaCO3) crystals via an in-situ synthesis method. CaCl2 and Na2CO3 solutions with a concentration ratio of 1:1 were successively introduced into the thermally modified poplar wood obtained by steam heat treatment (HT) at 200°C for 1.5 and 3 h, resulting in the in-situ synthesis of CaCO3 crystals inside the heat-treated wood. The filling effect was best at the concentration of 1.2 mol/L. CaCO3 was uniformly distributed in the cell cavities of the heat-treated wood, and some of the crystals were… More > Graphic Abstract

    A Primary Study on Mechanical Properties of Heat-Treated Wood via <i>in-situ</i> Synthesis of Calcium Carbonate

  • Open Access


    Effects of Strain Rate and Fiber Content on the Dynamic Mechanical Properties of Sisal Fiber Cement-Based Composites

    Yubo Zhang, Ping Lei, Lina Wang, Jiqing Yang*

    Journal of Renewable Materials, Vol.11, No.1, pp. 393-410, 2023, DOI:10.32604/jrm.2022.022659

    Abstract In this paper, a split Hopkinson pressure bar (SHPB) was used to investigate the dynamic impact mechanical behavior of sisal fiber-reinforced cement-based composites (SFRCCs), and the microscopic damage evolution of the composites was analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDS). The results show that the addition of sisal fibers improves the impact resistance of cement-based composite materials. Compared with ordinary cement-based composites (OCCs), the SFRCCs demonstrate higher post-peak strength, ductility, and energy absorption capacity with higher fiber content. Moreover, the SFRCCs are strain rate sensitive materials, and their peak stress, ultimate strain, and energy integrals all… More >

  • Open Access


    A Comparison of Shale Gas Fracturing Based on Deep and Shallow Shale Reservoirs in the United States and China

    Qixing Zhang1,2, Bing Hou1,2,*, Huiwen Pang1,2, Shan Liu1,2, Yue Zeng1,2

    CMES-Computer Modeling in Engineering & Sciences, Vol.133, No.3, pp. 471-507, 2022, DOI:10.32604/cmes.2022.020831

    Abstract China began to build its national shale gas demonstration area in 2012. The central exploration, drilling, and development technologies for medium and shallow marine shale reservoirs with less than 3,500 m of buried depth in Changning-Weiyuan, Zhaotong, and other regions had matured. In this study, we macroscopically investigated the development history of shale gas in the United States and China and compared the physical and mechanical conditions of deep and shallow reservoirs. The comparative results revealed that the main reasons for the order-ofmagnitude difference between China’s annual shale gas output and the United States could be attributed to three aspects:… More >

  • Open Access


    Physical and Mechanical Properties of Catalpa bungei Clones and Estimation of the Properties by Near-Infrared Spectroscopy

    Rui Wang, Lanlan Shi, Yurong Wang*

    Journal of Renewable Materials, Vol.10, No.12, pp. 3285-3302, 2022, DOI:10.32604/jrm.2022.020546

    Abstract Air-dry density, modulus of rupture (MOR), modulus of elasticity (MOE), compressive strength parallel to grain, and hardness of Catalpa bungei clones were investigated in this study with feasibility of predicting these properties by near-infrared (NIR) spectroscopy. The best candidate ‘Luoqiu 3’ has been selected from three clones based on wood physical and mechanical property indices. Lower values of wood physical and mechanical properties have been found in the corewood compared to the outerwood. There were significant positive correlations between the air-dry density and mechanical properties. Information from cross section for air-dry density, compressive strength parallel to grain, and hardness yielded… More >

  • Open Access


    Mechanical Properties and Evolution of Microstructure of Cement Stabilized Loess

    Kangze Yuan1, Kui Liu1,2,*, Guoyang Yi3, Bowen Yang2

    Journal of Renewable Materials, Vol.10, No.12, pp. 3611-3627, 2022, DOI:10.32604/jrm.2022.022458

    Abstract Cement Stabilized Loess (CSL) sample has a long history as a method of improving building foundations. In this paper, the main physical (specific gravity, consistency limit, optimum moisture content, and maximum dry density) and mechanical properties (Unconfined Compressive Strength (UCS) and shear strength parameters) of CSL samples with different cement content were investigated, and the change reasons were explored by mean of SEM test. Meanwhile, quantitative analysis software Image-Pro Plus (IPP) 6.0 was used to characterize the microstructural evolution of pores in compacted loess and CSL sample. As the cement content increased, the specific gravity and optimum water content in… More > Graphic Abstract

    Mechanical Properties and Evolution of Microstructure of Cement Stabilized Loess

  • Open Access


    Mechanical Properties, Biocompatibility and Anti-Bacterial Adhesion Property Evaluation of Silicone-Containing Resin Composite with Different Formulae

    Muzi Liao1,2,#, Hui Tong1,2,#, Xiangya Huang1,2, Fang Liu3, Jingwei He3,*, Sui Mai1,2,*

    Journal of Renewable Materials, Vol.10, No.12, pp. 3201-3215, 2022, DOI:10.32604/jrm.2022.022090

    Abstract Novel branched silicone methacrylate was developed. The mechanical and biological properties of the resin system were investigated to select the formula proportion with the best overall performance. The novel silicone-containing monomers were combined with an incremental sequence of glass filler concentrations in commonly used Bis-GMA/TEGDMA (50/50, wt./wt.) dental resin systems. Physicochemical properties, surface properties, antibacterial adhesion effect, anti-biofilm effect, protein adsorption, and cytotoxicity were evaluated. The results showed that BSMs did not affect the double bond conversion of dental resin, but could reduce volumetric shrinkage (p < 0.05). The BSM containing resins can resist protein and bacteria adhesion (S. Mutans)… More >

  • Open Access


    Study on the Structural Characteristics and Physical and Mechanical Properties of Phoebe bournei Thinning Wood

    Jiabiao Wu, Jiayin Liang, Muyang Chen, Siqi Zheng, Jianying Xu*

    Journal of Renewable Materials, Vol.10, No.11, pp. 3025-3039, 2022, DOI:10.32604/jrm.2022.019989

    Abstract The artificial afforestation of precious Phoebe bournei has been carried out in China. During the cultivation process, thinning wood will be produced. The properties of thinning wood might vary greatly with matured wood and require evaluation for better utilization. The objective of the present study aims to determine the wood structure, fiber morphology, and physical and mechanical properties of the Phoebe bournei thinning wood to help us understand the wood properties and improve its utility value. Three 14-year-old Phoebe bournei were cut from Jindong Forestry Farm of Hunan Province, China. The wood structure and fiber morphology were observed and analyzed… More > Graphic Abstract

    Study on the Structural Characteristics and Physical and Mechanical Properties of <i>Phoebe bournei</i> Thinning Wood

  • Open Access


    Mechanical Properties of Soil-Rock Mixture Filling in Fault Zone Based on Mesostructure

    Mei Tao1, Qingwen Ren1,*, Hanbing Bian2, Maosen Cao1, Yun Jia3

    CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.2, pp. 681-705, 2022, DOI:10.32604/cmes.2022.019522

    Abstract Soil-rock mixture (SRM) filling in fault zone is an inhomogeneous geomaterial, which is composed of soil and rock block. It controls the deformation and stability of the abutment and dam foundation, and threatens the long-term safety of high arch dams. To study the macroscopic and mesoscopic mechanical properties of SRM, the development of a viable mesoscopic numerical simulation method with a mesoscopic model generation technology, and a reasonable parametric model is crucially desired to overcome the limitations of experimental conditions, specimen dimensions, and experiment fund. To this end, this study presents a mesoscopic numerical method for simulating the mechanical behavior… More >

  • Open Access


    Characterization of Mechanical Properties of Waste Slurry Modified by Recycled Sand and Cement

    Beifeng Lv, Na Li*, Haibo Kang, Yanting Wu, Ben Li, Wei Wang

    Journal of Renewable Materials, Vol.10, No.10, pp. 2669-2683, 2022, DOI:10.32604/jrm.2022.019418

    Abstract In order to study the modification effect of recycled sand on cement reinforced waste slurry (CWS), triaxial test, scanning electron microscope test and X-ray diffraction test were carried out. The mechanical test of recycled sand and cement reinforced waste slurry (RCWS) shows that the deviatoric stress–strain curve of RCWS samples changes from hardening type to softening type with the increase of recycled sand content; the peak stress increases with the increase of recycled sand content; recycled sand can enhance the shear strength of CWS by increasing both cohesion and internal friction angle. The microscopic test shows that recycled sand can… More >

  • Open Access


    Effect of Waste Marble Powder on Physical and Mechanical Properties of Concrete

    Yumei Wang1,3, Jianzhuang Xiao1,*, Jintuan Zhang1,2,4,*

    Journal of Renewable Materials, Vol.10, No.10, pp. 2623-2637, 2022, DOI:10.32604/jrm.2022.019381

    Abstract The emission of greenhouse gases from cement production is an obstacle for sustainable development of construction industry. The use of waste materials in constructions instead of cement could be a feasible solution to green construction. Waste marble powder with good cementing property can be used in concrete partially replace cement. In this research, the effects of using waste marble powder on the physical and mechanical properties of concrete have been studied. Three groups of particle size and five levels of replacement ratio (5%, 10%, 15%, 20%, 25%) for each group have been designed. During the different stage of hydration process,… More >

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