Article
Construction & Building Technology
Yuke Wang, Zhenhai Wang, Yuyuan Chen, Tiancai Cao, Xiang Yu, Pang Rui
Summary: As the Yellow River has the highest silt content in the world, it is annually dredged for flood control. However, the dredged silt cannot be directly used as construction filling material due to its low strength and stability. This study proposes the use of soybean urease induced calcium carbonate precipitation (SICP) method to solidify the Yellow River silt and improve its mechanical properties. The optimum bio-treatment recipe is determined through various tests, and the effectiveness of the solidification is verified by microscopic analysis. This method provides a technical approach for the resource utilization of Yellow River silt.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Luyang Xu, Shuomang Shi, Fei Yan, Ying Huang, Yi Bao
Summary: This study investigates the combined effect of mechanical loads and corrosion using designed polytetrafluoroethylene tube-packaged fiber Bragg grating sensors. A simplified model for strain measurement based on long-gauge fiber Bragg grating was proposed, and a systematic corrosion assessment strategy was developed. Experimental tests on steel specimens embedded with fiber Bragg grating sensors revealed more severe corrosion damage under combined conditions, with higher mass loss and faster pit depth development compared to individual corrosion conditions. The average corrosion rate was also significantly higher under combined conditions.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Energy & Fuels
Xin Zhang, Jiyun Tang, Juan Chen, Zhanlong Song, Yong Dong
Summary: During the co-pyrolysis of waste tires (WT) and waste plastic (PVC), volatile ZnCl2 is produced due to the presence of ZnO in WT and Cl in PVC. The addition of PVC reduces the relative enrichment of Zn in the solid product by 42.4% at 850 degrees C. CaO and Al2O3 facilitate Zn release, while MgO and Fe2O3 have enrichment effects on Zn. The adsorption mechanisms of metal oxides to ZnCl2 were investigated using density functional theory, revealing that ZnCl2 is physisorbed by Al2O3 and chemisorbed by CaO, Fe2O3, and MgO.
Article
Engineering, Environmental
Matteo Calosi, Marco Renon, Giada Belletti, Valentina Mazzanti, Francesco Mollica, Alessandro Massi, Monica Bertoldo
Summary: This study focuses on the depolymerization of rigid semi-Interpenetrated Polymer Network (semi-IPN) foam based on poly(vinyl chloride) (PVC) and cross-linked polyurea/isocyanurate, aiming to separate and reuse the individual components. By optimizing the glycolysis conditions, the researchers successfully depolymerized the crosslinked portion and recovered PVC with minimal degradation.
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Engineering, Environmental
Dan Akesson, Gauthaman Kuzhanthaivelu, Martin Bohlen
Summary: The study found that contaminating conventional plastics with biopolymers significantly affects their mechanical and thermal properties, with a reduction in elongation at break for HDPE and PP, and a loss of impact strength for PET even at 1% contamination.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Polymer Science
Mohammad Ali Tavanaie, Amir Hossein Ghahari
Summary: The research found that PP/TPS granules can be extruded up to four times with slight changes on the fifth repetition; blending single-extruded granules with virgin material can reach a 50:50% composition without significant variation.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Vincenzo Titone, Maria Chiara Mistretta, Luigi Botta, Francesco Paolo La Mantia
Summary: This study focuses on the impact of mechanical recycling of biodegradable materials on the properties of monopolymer blends. The results show that the concentration of recycled material has a minor effect on the properties of the blends, while multiple extrusions can change the mechanical properties of the polymer.
Article
Polymer Science
Yang Yang, Caili Zhang, Yu Han, Yunxuan Weng
Summary: Poly(vinyl chloride) (PVC) is a widely used plastic that requires the use of plasticizers to improve its processability. In this study, alternatives to commonly used toxic phthalate-based plasticizers were proposed, based on epoxidized soybean oil (ESO) and epoxidized cardanol esters (ECEs). It was found that epoxidized cardanol-myristate (ECD-MA) showed the best plasticizing effect. Furthermore, PVC/30ESO/5ECD-MA polymer exhibited high thermal stability and mechanical properties.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Review
Polymer Science
Krzysztof Lewandowski, Katarzyna Skorczewska
Summary: This article provides a literature review on the recycling of PVC, including mechanical recycling and feedstock recycling methods. It also introduces the characteristics of PVC and its potential in the circular economy.
Article
Thermodynamics
Guoqiang Chai, Guoqing Zhu, Jinju Zhou, Yunji Gao, Ying Zhou, Yang Wang
Summary: The experimentation on PVC fabric membrane revealed its softening and melting temperature, as well as critical temperature, while also confirming the feasibility of using Fire Dynamics Simulation to study membrane structure fires.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Shin Komatsu, Satoru Kawasaki
Summary: The addition of wastepaper fiber has a significant impact on the sand treated by microbially-induced carbonate precipitation, improving the ductility and strength of the material, but a high content can lead to rapid deterioration of the samples in freeze-thaw cycles.
Article
Engineering, Mechanical
Claudia Sergi, Fabrizio Sarasini, Pietro Russo, Libera Vitiello, Enrique Barbero, Sonia Sanchez-Saez, Jacopo Tirillo
Summary: This study aims to provide a thorough understanding of the impact behavior of agglomerated cork and the resulting sandwich structures. The results show that agglomerated cork, when used as core material, can improve its impact resistance and approach the performance of polyvinyl chloride foam.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Yufeng Ma, Zhimin Kou, Puyou Jia, Jing Zhou
Summary: This study synthesized two bio-based plasticizers, IPE and OPE, and investigated their effects on the performance of PVC films. It was found that IPE played a significant role in the tensile strength of PVC films, while OPE had a noticeable effect on the tensile strain. OPE showed a more efficient plasticizing effect on PVC compared to IPE, with the highest tensile strain achieved in OPE-plasticized PVC films.
Article
Materials Science, Composites
Somanath Ojha, Himanshu Bisaria, Smita Mohanty, Krishnan Kanny
Summary: This research investigates the chemical, thermal, mechanical, thermo-mechanical properties, and fractography of sandwich composites made from E-glass-reinforced isophthalic polyester with PVC foam as a core by hand. The results show that the sandwich composite with double layers of E-glass exhibits superior mechanical and thermal properties. Examination of the fractured surfaces reveals the structure characteristics of the composites.
POLYMER COMPOSITES
(2023)
