Zhiyong Yang¹, Jiacheng Zhang¹, Henglin Xiao^1,2, Zhi Chen^1,*, Tian Bao¹, Yin Liu¹

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.9, pp. 2267-2288, 2023, DOI:10.32604/fdmp.2023.028652

Abstract The use of carbon-fiber heating cables (CFHC) to achieve effective melting of snow and ice deposited on roads is a method used worldwide. In this study, tensile and compressive tests have been conducted to analyze the mechanical properties of the CFHC and assess whether the maximum tensile and compressive strengths can meet the pavement design specifications. In order to study the aging produced by multiple cycles of heating and cooling, in particular, the CFHC was repeatedly heated in a cold chamber with an ambient temperature ranging between −20°C and +40°C. Moreover, to evaluate how the strength of the pavement is… More > Graphic Abstract

Wei Chen^1,*, Weijie Shan¹, Yue Liang¹, Frederic Skoczylas²

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.3, pp. 679-696, 2023, DOI:10.32604/fdmp.2022.021249

Abstract This study deals with the analysis of the detrimental effects of a “sulfate attack” on cement mortar for different dry-wet cycles. The mass loss, tensile strength, and gas permeability coefficient were determined and analyzed under different exposure conditions. At the same time, nitrogen adsorption (NAD), scanning electron microscopy (SEM), and X-ray diffraction (XRD) techniques were used to analyze the corresponding variations in the microstructure and the corrosion products. The results show that certain properties of the cement mortar evolve differently according to the durations of the dry-wet cycles and that some damage is caused to the mortars in aqueous solution.… More >

Yunxia Zhou¹, Hisham Essawy², Ai Liu¹, Chenyu Yang¹, Defa Hou¹, Xiaojian Zhou^1,*, Guanben Du¹, Jun Zhang^1,*

Journal of Renewable Materials, Vol.11, No.2, pp. 837-852, 2023, DOI:10.32604/jrm.2022.022792

Abstract This study presents an easily prepared film based on alkaline starch-polyvinyl alcohol hybrid and lignin fiber as an additive (SPL film). The SPL film was prepared under acidic conditions through a polycondensation reaction of PVA and a mixture incorporating alkaline starch and lignin fiber from agriculture or forest source. The examination using scanning electron microscopy (SEM) showed that the surface of SPL film was smooth and the lignin fiber had good compatibility within the film hybrid. Electrospray ionization mass spectroscopy (ESI-MS) and fourier transform infrared (FTIR) investigations indicated that alkaline starch and lignin fiber reacted with PVA under acidic conditions… More > Graphic Abstract

Sihan Wang, Reza Masoodi^*, Janet Brady, Brian R. George

Journal of Renewable Materials, Vol.1, No.4, pp. 279-288, 2013, DOI:10.7569/JRM.2013.634122

Abstract Recycled natural fi bers and biopolymers with sustainable, eco-friendly, and biodegradable properties are receiving increased attention. The moisture absorption and swelling of natural fi ber composites adversely infl uence their mechanical properties and applications. In this research, bio-based epoxy polymers that are reinforced with recycled woven jute fabrics were subjected to water immersion tests in order to study the effect of water absorption on their mechanical and geometrical properties. For comparison, petroleum-based epoxy polymers that are reinforced with new woven jute fabrics were also subjected to the same tests. The effect of fi ber percentage on water absorption, thickness swelling,… More >

Pronob Gogoi, Dhaneswar Das, Shyamalima Sharma, Swapan K. Dolui^*

Journal of Renewable Materials, Vol.3, No.2, pp. 151-159, 2015, DOI:10.7569/JRM.2014.634129

Abstract Alkyd resins based on Jatropha curcas oil with different molar ratios of phthalic anhydride (PA) and maleic anhydride (MA) were prepared by alcoholysis followed by polyesterifi cation reaction. The progress of the reaction was traced by the determination of acid value at regular time intervals. From the kinetic study the extent of the reaction was found in the range of 52.4–61.2%. The prepared resins were blended with a commercially available fast-curing epoxy resin in order to improve the properties like curing time, chemical resistance, tensile strength, and thermal stability. The morphology study of the blends showed good compatibility of alkyd… More >

Qiang Su, Jinming Xu^*

Journal of Renewable Materials, Vol.11, No.1, pp. 233-244, 2023, DOI:10.32604/jrm.2023.020573

Abstract To enhance the sulfate attack resistance performance of concrete, Sulfate erosion test was carried out on basalt fiber concrete with different contents, selecting a concentration of 5% sulfate solution and using a dry−wet cycle mechanism attack of basalt fiber-reinforced concrete (BFRC). Every 15 dry−wet cycles, the mass, compressive strength, splitting tensile strength, and relative dynamic elastic modulus of BFRC were tested, and the SO₄²⁻ concentration was measured. This work demonstrates that the mass, relative dynamic elastic modulus, compressive and splitting tensile strength of BFRC reveal a trend of climb up and then decline with the process of the dry−wet cycle.… More >

Jianhua Lyu^1,2,#, Jialei Wang^1,2,#, Ziqiang Chen³, Ming Chen^1,2,*

Journal of Renewable Materials, Vol.11, No.1, pp. 309-319, 2023, DOI:10.32604/jrm.2022.021478

Abstract The traditional tenon and mortise joint has low processing efficiency and a weak theoretical basis, making the structure easy to deform and damage, reducing the safety, and increasing waste of resources. This study aims to determine the optimum dowel center spacing parameter for chamfered-joint components and the maximum value of the strength of joints loaded into bending strength and tensile strength. In this study, an integrated optimization method combining the single-factor test and one-way ANOVA analysis was proposed to study the influence of the dowel center spacing on the bending strength and the tensile strength of chamfered-joint components made by… More >

Junlong Yao^1,2, Wei Nie¹, Zhengguang Sun², Huan Yang^1,3,*, Yu Guan¹, Lin Gao⁴, Xueliang Jiang¹, Mujie Guo¹, Chuanxi Xiong^5,*

Journal of Renewable Materials, Vol.10, No.9, pp. 2355-2364, 2022, DOI:10.32604/jrm.2022.019339

Abstract In general, self-healing dielectric composites are mainly composed of polar hydrogen bonds, which have high hydrophilicity and are unsuitable for humid environment. Dielectric composite with Diels-Alder (D-A) bond contains covalent bonds, it can be adopted as an efficient self-healing material. Here, we construct self-healing barium titanate (BT)/polyurethane (PU) dielectric composites by adopting PU with D-A bond as matrix (BT/ PU-DA). The prepared 10% BT/PU-DA composite exhibits superior self-healing ability than that of PU-DA. Moreover, its dielectric constant can reach 9.3 with a loss of only 0.04 at 1000 Hz and maintain 93% repair effi- ciency of tensile strength. The experimental… More >

Biqing Shu^1,2, Lu Hong³, Suxia Li^1,4, Yupeng Tao², Jianxin Cui¹, Naiqiang Fu², Junbao Yu², Chen Li², Xiaoning Lu^1,*

Journal of Renewable Materials, Vol.10, No.8, pp. 2203-2216, 2022, DOI:10.32604/jrm.2022.019882

Abstract In this work, we used tensile tests to analyze the tangential failure forms of raw bamboo and determine a relationship between tangential tensile strength, elastic modulus, position, density, and moisture content. We found that the tangential mechanical properties of the culm wall were mainly dependent on the mechanical properties of the basic structure of the thin wall. Formulas for calculating the tangential tensile strength of moso bamboo and adjusting the moisture content were also determined. The tangential tensile strength and the tangential tensile modulus of elasticity (TTMOE) followed: outer > middle > inner, and diaphragm > bamboo node > culm… More >

Ismail Shah^1,2, Jing Li^1,2,*, Shengyuan Yang¹, Yubo Zhang¹, Aftab Anwar^1,2

Journal of Renewable Materials, Vol.10, No.5, pp. 1307-1320, 2022, DOI:10.32604/jrm.2022.017513

Abstract Recently, addition of various natural fibers to high strength concrete has aroused great interest in the field of building materials. This is because natural fibers are much cheaper and locally available, as compare to synthetic fibers. Keeping in view, this current research conducted mainly focuses on the static properties of hybridized (sisal/coir), sisal and coir fiber-reinforced concrete. Two types of natural fibers sisal and coir were used in the experiment with different lengths of 10, 20 and 30 mm and various natural fiber concentrations of 0.5%, 1.0%, and 1.5% by mass of cement, to investigate the static properties of sisal… More > Graphic Abstract