Zhongnan Gao^1,2,#, Xiumei Zhong^1,2,#, Qian Wang^1,2,*, Yongqi Su³, Jun Wang^1,2

Journal of Renewable Materials, Vol.10, No.4, pp. 1063-1080, 2022, DOI:10.32604/jrm.2022.017374

Abstract In the seasonal permafrost region with loess distribution, the influence of freeze-thaw cycles on the engineering performance of reinforced loess must be paid attention to. Many studies have shown that the use of fiber materials can improve the engineering performance of soil and its ability to resist freeze-thaw cycles. At the same time, as eco-environmental protection has become the focus, which has been paid more and more attention to, it has become a trend to find new environmentally friendly improved materials that can replace traditional chemical additives. The purpose of this paper uses new environmental-friendly improved materials to reinforce the… More >

Ting Huang, Xin Zhuo^*

Journal of Renewable Materials, Vol.10, No.4, pp. 993-1005, 2022, DOI:10.32604/jrm.2022.017373

Abstract The construction of grouting butt joints of bamboo tubes is simple and efficient. However, when the joint is bent, the low tensile strength of the mortar easily leads to cracking of the mortar prior to the failure of the bamboo tube. In this paper, a comparative test of the bending capacity was performed on grouting butt joints reinforced by nonperforated, fully perforated, and semiperforated steel plates embedded in bamboo tubes to obtain the load-displacement curves and ultimate bearing capacity of various specimens. The strengthening effect of CFRP pasted on bamboo tubes was also studied. The results show that the opening… More > Graphic Abstract

Yingchun Yang^1,*, Liqing Chen¹, Xingdong Sun¹, Yuguang Mao²

Journal of Renewable Materials, Vol.10, No.4, pp. 1007-1023, 2022, DOI:10.32604/jrm.2022.017372

Abstract Herein, micro iron ore tailings (micro-IOTs) were prepared by wet-grinding and applied to improve sulphoaluminate cement (SAC) performance. The physicochemical properties of micro-IOTs were investigated by particle size analysis, XRD, and XPS. The hydrates trait and the hydration mechanism of micro-IOTs-SAC composite were studied by XRD, TGA, MIP, and SEM. The results demonstrated that micro-IOTs with an average grain diameter of 517 nm could be obtained by wet-grinding. The setting time of SAC gradually decreased with increasing micro-IOTs content. By adding 2% micro-IOTs, the compressive strengths of SAC pastes were enhanced about 22% and 10% at 4 h and 28… More >

Caili Yu, Hao Liu, Jintao Shao, Faai Zhang^*

Journal of Renewable Materials, Vol.10, No.4, pp. 1049-1061, 2022, DOI:10.32604/jrm.2022.017315

Abstract Preparation of polymer microspheres from naturally occurring resource is a challenge. Here, a rosin-based polyol (RAG) was used to prepare polyurethane resin (RPU) firstly, and then act as both self-assembled precursor and emulsifier, rosin based polyurethane microspheres (RPUMs) were prepared. In the process of self-emulsification, the RPU formed vesicles by self-assembly. The outer shell of the vesicle consisted of hydrophilic segments, while the inner shell contained the hydrophobic phase. After cross-linking the RPU and removal of the solvent in the core, the porous-hollow microspheres with pH-sensitive were obtained. The microspheres were characterized by optical microscope (OM), scanning electron microscopy (SEM)… More > Graphic Abstract

Xu Yan¹, Changheng Liu², Liang Qiao¹, Kaili Zhu², Hongsheng Tan^1,*, Shuhua Dong¹, Zhitao Lin¹

Journal of Renewable Materials, Vol.10, No.4, pp. 1039-1048, 2022, DOI:10.32604/jrm.2022.017239

Abstract The crystallization behavior, crystal morphology and form, and viscoelastic behavior of poly(butylene succinate) (PBS) and coir fiber/PBS composites (CPB) were investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), X-ray diffraction (XRD) and dynamic mechanical analysis (DMA). The results of DSC measurement show that the crystallization temperature increases with the filling of coir fibers. POM images reveal that the spherulitic size and crystallization behavior of PBS are influenced by the coir fibers in the composites. XRD curves show that the crystal form of pure PBS and CPB are remaining almost identical. In addition, the storage modulus of CPB significantly… More >

Liefei Pei, Xiangyun Zhang, Zizhou Yuan^*

Journal of Renewable Materials, Vol.10, No.4, pp. 955-968, 2022, DOI:10.32604/jrm.2022.016961

Abstract Fe-Si-B amorphous zero-valent iron has attracted wide attention because of its efficient remediation of heavy metals and dye wastewater. In this paper, the remediation effect of amorphous zero-valent iron powder (Fe₇₈Si₉B₁₃^AP) on Ni contaminated soil was investigated. Results show that the immobilization efficiency of nickel in soil by Fe₇₈Si₉B₁₃^AP with low iron content is higher than that by ZVI. The apparent activation energies of the reactions of Fe₇₈Si₉B₁₃^AP with Ni²⁺ ions is 25.31 kJ/mol. After continuing the reaction for 7 days, Ni²⁺ ions is mainly transformed into monoplasmatic nickel (Ni⁰) and nickel combined with iron (hydroxide) oxides. Microstructure investigations show… More >

Xiang Deng¹, Sudong Hua^1,*, Fan Xia², Yanfang Zhang², Dapeng Guo³, Xinxing Zhu³, Defei Zhu³

Journal of Renewable Materials, Vol.10, No.4, pp. 939-953, 2022, DOI:10.32604/jrm.2022.016874

Abstract Recycled powder (RP) is produced as a by-product during the process of recycling construction and demolition (C&D) wastes, presenting a low additional value. Using RP-based solidifying material can not only improve its utilization efficiency, but also reduce the cost of commercial solidifying materials. To date, this is the best solidifying material utilized to dispose the original waterworks sludge (OWS) with high moisture contents (60%), and the product could be used to fabricate non-fired bricks. This has become a new environment-friendly technology of “using waste to treat waste”. In this paper, the influence of different particle sizes and dosages of RP… More >

Song Yang¹, Bing Qi¹, Zubin Ai¹, Zhensheng Cao¹, Shiqin He^2,*, Lijun Li³

Journal of Renewable Materials, Vol.10, No.4, pp. 897-908, 2022, DOI:10.32604/jrm.2022.016653

Abstract It has become a research hotspot to explore raw material substitutes of concrete. It is important to research the mechanical properties of self-compacting concrete (SCC) with slag powder (SP) and rubber particle (RP) replacing cement and coarse aggregate, respectively. 12 kinds of composite modified self-compacting concrete (CMSCC) specimens were prepared by using 10%, 20% and 30% SP and 30%, 40%, 50% and 60% RP. The rheological properties, mechanical properties and microstructure of the CMSCC were investigated. Results indicate that the workability, compressive strength, splitting tensile strength and flexural strength of CMSCC prepared by 20% SP and less than 40% RP… More >

Yong Chen¹, Yinghao Huang^1,2,*, Min Wu¹ and Shuo Wang¹

Journal of Renewable Materials, Vol.10, No.4, pp. 1153-1173, 2022, DOI:10.32604/jrm.2022.018856

Abstract Phase change materials (PCMs) can store large amounts of energy in latent heat and release it during phase changes, which could be used to improve the freeze-thaw performance of soil. The composite phase change material was prepared with paraffin as the PCM and 8% Class C fly ash (CFA) as the supporting material. Laboratory tests were conducted to reveal the influence of phase change paraffin composite Class C fly ash (CFA-PCM) on the thermal properties, volume changes and mechanical properties of expansive soil. The results show that PCM failed to establish a good improvement effect due to leakage. CFA can… More >

Sha Shen¹, Saidi Wang^2,*, Md Zahir Ahmed³, Fatema Akhter Hiramoni⁴, Jingrong Sha¹, Xiangdong Yan⁵, Mary C. Jobe⁶ and Oli Ahmed⁷

International Journal of Mental Health Promotion, Vol.23, No.4, pp. 499-511, 2021, DOI:10.32604/IJMHP.2021.018661

Abstract This study examined the moderating effects of parent-child, same-sex, opposite-sex and teacher-student relationships between sibling status and loneliness during COVID-19. A total of 1,591 adolescents in China completed the study questionnaires which assessed the aforementioned variables. The results showed that same-sex and teacherstudent relationships moderated the association between sibling status and loneliness. The results indicated that among participants with good same-sex relationships during COVID-19, compared to non-only-children participants, the only-children participants were more likely to experience a lower level of loneliness. However, participants with poor same-sex relationships experienced similar level of loneliness regardless of whether they had siblings. These findings… More >