Article
Construction & Building Technology
Hossein Sasanipour, Farhad Aslani, Javad Taherinezhad
Summary: The study found that using pretreated recycled aggregates significantly improved durability properties of concrete mixes, especially in terms of chloride ion penetration and electrical resistance. SEM images showed that pretreated RCAs had a significant impact on improving the interface transition zone, resulting in lower permeability and higher electrical resistance of specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Muhammad Jawad Ashraf, Maria Idrees, Arslan Akbar
Summary: The utilization of silica fume and carbon fibers can significantly improve the mechanical properties and durability of recycled aggregate concrete. The combined use of these materials leads to increased compressive, split tensile, and flexural strength, as well as reduced mass loss from acid attack. This research is of great importance for the production of environmentally friendly concrete.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Ozgur Cakir, Hasan Dilbas
Summary: This study investigated the effects of optimized Ball Mill Method (oBMM) with silica fume (SF) and/or basalt fiber (BF) on durability of treated recycled aggregate concrete (RAiC), finding that oBMM significantly improved the performance of concrete. TOPSIS method was found to be useful in selecting the best concrete series objectively.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Long Li, Dongxing Xuan, S. H. Chu, Chi Sun Poon
Summary: This study aimed to enhance the mechanical properties and durability of recycled aggregate concrete (RAC) by spraying colloidal nano silica (NS) and silica fume (SF) on the surface of recycled coarse aggregate (RCA), with larger particle sizes of NS showing more significant performance enhancement. The research found that spraying colloidal SF on RCA improved both the new mortar and new interfacial transition zone (ITZ) in RAC, while spraying colloidal NS only enhanced the new ITZ.
MATERIALS AND STRUCTURES
(2021)
Article
Construction & Building Technology
Ali S. Alqarni, Husain Abbas, Khattab M. Al-Shwikh, Yousef A. Al-Salloum
Summary: This study aims to investigate the impact of recycled concrete aggregates (RCA) on concrete performance at different replacement levels and treatment methods. The results show that treated RCA with various methods can significantly improve the fresh and mechanical properties of concrete, especially at higher replacement levels.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Feihu Wang, Danying Gao, Zhi Xu, Tao Zhang
Summary: This study compared the axial compressive properties of steel fiber-reinforced recycled-fine-aggregate concrete (SFRFAC) using prism and cylinder specimens. The effects of factors such as RFA replacement ratio, steel fiber volume fraction, steel fiber type, and silica fume content on the compressive properties of SFRFAC were analyzed. The results showed that the prism specimen had smaller compressive strength and peak strain but larger elastic modulus and compression work compared to the cylinder specimen. The addition of RFA, steel fiber, and silica fume had different effects on the compressive properties of SFRFAC.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tang Yunchao, Chen Zheng, Feng Wanhui, Nong Yumei, Li Cong, Chen Jieming
Summary: The combination of silica fume and nano-silica as additives improves the performance of recycled aggregate concrete in both early and later stages. These additives exhibit good pozzolanic activity, enhancing the secondary hydration reaction with calcium hydroxide to improve the properties of the interface transition zone.
NANOTECHNOLOGY REVIEWS
(2021)
Article
Construction & Building Technology
Lihua Zhu, Qiujun Ning, Wei Han, Leilei Bai
Summary: The mechanical performance of recycled aggregate concrete was significantly improved by incorporating silica fume, which improved the quality of the recycled coarse aggregate and reduced the thickness of the interfacial transition zone.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Huayu Wang, Pinghua Zhu, Xiancui Yan, Hui Liu, Lei Zhu, Xinjie Wang
Summary: This study investigates the effects of silica fume (SF) dosages on the mechanical properties and frost resistance of recycled aggregate concrete (RAC) under freeze-thaw (F-T) environment. The results show that the incorporation of SF effectively improves the mechanical properties and frost resistance of RAC, with an optimal SF dosage around 13%.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Feihu Wang, Danying Gao
Summary: This paper investigated the splitting tensile and axial tensile behaviors of steel fiber recycled fine aggregate concrete (SFRFAC). The effects of RFA replacement ratio, steel fiber volume fraction, steel fiber type and silica fume content on the tensile properties of SFRFAC were studied. The results showed that RFA decreased the splitting tensile strength, axial tensile strength, and axial tensile elastic modulus of SFRFAC, while the addition of steel fiber and silica fume enhanced these properties. The relationship between splitting tensile strength and axial tensile strength, as well as the axial tensile stress-strain relationship of SFRFAC, were proposed.
Review
Materials Science, Multidisciplinary
Mohammad Nadeem Akhtar, Mohammed Jameel, Zainah Ibrahim, N. Muhamad Bunnori
Summary: This review article addresses the issues of river sand mining and CO2 emissions from the construction sector. It examines the impact of recycled aggregates and silica fume on concrete strength and durability. The findings suggest that a certain percentage of recycled aggregates can achieve comparable strength to natural aggregates, and silica fume can improve concrete strength within a specific range of inclusion. Calculations for China indicate that replacing cement with silica fume and river sand with recycled fine aggregate can significantly reduce CO2 emissions and save river sand consumption. The combination of recycled aggregates and silica fume offers an environmentally friendly and sustainable solution for concrete production.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Multidisciplinary
Jason Maximino C. Ongpeng, John Barra, Kristin Carampatana, Christian Sebastian, Julienne James Yu, Kathleen B. Aviso, Raymond R. Tan
Summary: The study focuses on using Recycled PET bottles as reinforcement for rectangular concrete columns, resulting in a significant increase in compressive strength and practicality for construction in rural areas with low skilled workers. Further research is recommended to test long-term durability and scalability of this waste management solution.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2021)
Article
Construction & Building Technology
Davoud Tavakoli, Pouyan Fakharian, Jorge de Brito
Summary: The study investigates the use of waste clay bricks in roller-compacted concrete pavement (RCCP) as a substitute for sand. Silica fume (SF) was utilized to enhance the mechanical properties of the concrete. Results showed that up to 25% substitution of brick waste for sand did not have significant adverse effects on RCCP, but beyond 50%, the properties of concrete were affected. SF improved concrete properties and mitigated the negative effects of using brick waste in RCCP.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
Tao Meng, Song-lin Yu, Huadong Wei, Sheng Zhu
Summary: Recycled concrete has lower mechanical properties compared to natural aggregate concrete, but its compressive strength can be improved by spraying a nanocomposite slurry or mixing with strengthening materials.
ADVANCES IN STRUCTURAL ENGINEERING
(2021)
Article
Construction & Building Technology
Shaolong Guo, Dongjian Zheng, Lihong Zhao, Qun Lu, Xiaoke Liu
Summary: The use of Recycled Plastic Fiber Reinforced Recycled Concrete (RPFRRC) can improve the mechanical properties of concrete and reuse waste. Adding an appropriate amount of recycled plastic fibers can enhance the compressive and flexural tensile strength of RPFRRC. Fiber length, confining pressure, and fiber volume ratio have significant influences on the performance of RPFRRC.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Ngoc Kien Bui, Tomoaki Satomi, Hiroshi Takahashi
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Construction & Building Technology
Ngoc Kien Bui, Tomoaki Satomi, Hiroshi Takahashi
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Green & Sustainable Science & Technology
Ngoc Kien Bui, Tomoaki Satomi, Hiroshi Takahashi
JOURNAL OF CLEANER PRODUCTION
(2019)
Article
Construction & Building Technology
Thu Trang Nguyen, Ngoc Hung Tran, Ngoc Kien Bui, The Thuan Vu, Huy Khang Pham, Xuan Cay Bui
Summary: This paper presents the results of a study on the penetration, softening temperatures, and rheological characteristics of sulphur-bitumen binder (SBB) with different sulphur/bitumen ratios. The study also explores the application of SBB in asphalt concrete and examines its effect on mixing and compaction temperatures. The results show that SBB can significantly reduce the temperatures required for mixing and compaction, while improving the resistance of the pavement to rutting at high temperatures.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Proceedings Paper
Green & Sustainable Science & Technology
Nguyen Thu Trang, Tran Ngoc Hung, Vu The Thuan, Bui Ngoc Kien
Summary: SEAM has been effectively applied in some countries but needs further investigation in Vietnam conditions. Using sulfur in HMA can lower mixing temperature, improve performance parameters, but reduces crack resistance.
CIGOS 2021, EMERGING TECHNOLOGIES AND APPLICATIONS FOR GREEN INFRASTRUCTURE
(2022)
Article
Construction & Building Technology
Ngoc Kien Bui, Tomoaki Satomi, Hiroshi Takahashi
CONSTRUCTION AND BUILDING MATERIALS
(2017)
Article
Engineering, Civil
Ngoc Kien Bui, Tomoaki Satomi, Hiroshi Takahashi
INTERNATIONAL JOURNAL OF GEOMATE
(2018)
Article
Engineering, Environmental
Xiaojian Liu, Bei Wang, Yayun Ma, Xiangyang Zhou, Juan Yang, Yuehui He, Jingjing Tang, Fanyun Su, Wan Yang
Summary: This study proposes a combined process of reduction roasting of herb-medicine residue and oxalic acid leaching to improve the recovery efficiency of lithium from spent lithium-ion batteries. By utilizing the reducing gas produced from the pyrolysis of herb-medicine residue, the layered structure of the cathode powder is destroyed and converted into Li2CO3, Ni, Co, and MnO. Additionally, selective extraction of lithium is achieved using oxalic acid, and the efficiency and kinetics of lithium extraction are improved under the combined action of herb-medicine residue and oxalic acid.
Article
Engineering, Environmental
Muxina Konarova, Nuno Batalha, Gabriel Fraga, Mohamed H. M. Ahmed, Steven Pratt, Bronwyn Laycock
Summary: This study presents a proof of concept for a technology that integrates PET recovery from mixed plastic waste and plastic pyrolysis. By depolymerizing PET into TPA using a low volatility oil as medium, it achieves low-pressure operation and a selective separation and recovery of TPA from the product mix. Full PET conversion and high TPA recovery were achieved, making it an effective solution for processing mixed waste streams and improving the yield and quality of liquid product from thermal pyrolysis compared to untreated feedstock.
Article
Engineering, Environmental
Zhenhua Sun, Jing Li, Xuejiang Wang, Siqing Xia, Jianfu Zhao
Summary: This study investigated the influence of in-situ formed MgFe2O4 on the hydrothermal treatment of swine manure. The results showed that the in-situ formation of MgFe2O4 improved the dehydration and decarboxylation of organic components in swine manure, thereby improving its carbonization degree. Furthermore, it enhanced the stabilization of heavy metals and the retention of phosphorus. MgFe2O4 modified hydrochars exhibited remarkable adsorption capacity for Pb(II) and Cu(II) without any leaching of heavy metals.
Article
Engineering, Environmental
Yijing Jiang, Boyang Leng, Jingxin Xi
Summary: The increased generation of municipal solid waste has had a significant impact on the economy, environment, and public health. The current waste treatment process has limitations. By developing a comprehensive social costing model, this study assesses the impacts of municipal solid waste management throughout its life cycle and provides policymakers with best practices and feasibility information.
Article
Engineering, Environmental
Marina Hernandes de Paula e Silva, Ricardo Coser Mergulha, Jose Geraldo Vidal Vieira, Andrea Brasco Pampanelli, Rodrigo Salvador, Diogo Aparecido Lopes Silva
Summary: This study developed and implemented a self-assessment tool to assist companies in decision-making processes for establishing circular flows based on Lean Manufacturing and Circular Economy principles. The tool utilized a maturity model and was applied to nine companies of varying characteristics. The findings revealed that certain companies showed higher maturity in water-waste and chemical-emissions management, with larger enterprises focusing on these strategies. However, many companies lacked sufficient training and employee awareness prior to seeking cleaner alternatives, and comprehensive actions to manage the product lifecycle were lacking. To address these gaps, the tool provided tailored recommendations for each company to improve their processes, products, and value chain.
Article
Engineering, Environmental
Gamze Dogdu, Turgay Pekdemir, Sanaz Lakestani, Seyda Karabork, Osman Cavus
Summary: This paper presents data on food waste associated with mini size food packaging services, highlighting the difficulties in emptying the food and consumer wastefulness as the main causes. These findings have significant implications for the sustainability of food and relevant packaging.
Article
Engineering, Environmental
Qingxia Li, Xin Kong, Yuxin Chen, Jianan Niu, Jia Jing, Jin Yuan, Yifeng Zhang
Summary: This study investigates how to enhance methane production from food waste after hydrothermal pretreatment. The results demonstrate a significant increase in methane yield when zero-valent iron and magnetite are used together, and high organic loading is favorable for methane production. Microbial diversity analysis further reveals the dominant pathways and metabolic processes involved in methane generation.
Article
Engineering, Environmental
D. H. H. Sim, I. A. W. Tan, L. L. P. Lim, E. T. Lau, B. H. Hameed
Summary: The development of controlled-release fertilizer formulation is important for preventing environmental pollution caused by nutrient leaching and volatilization. This study combined biochar-based fertilizer with encapsulation technology to improve the nutrient release mechanism. Optimal conditions for synthesizing urea-impregnated biochar (UIB) were determined using central composite design, and the release of nitrogen was described by mathematical models. Results showed that encapsulated UIB (EUIB) achieved complete release of nitrogen in water and exhibited improved water retention in sandy-textural soil. Therefore, EUIB derived from peppercorn waste has the potential to be used as a sustainable controlled-release fertilizer for agriculture.
Article
Engineering, Environmental
Yuchuan Wang, Neslihan Akdeniz
Summary: Incorporating biochar into composting systems can increase compost temperatures. This study developed a heat transfer model for a biochar-amended co-composting system and found that biochar increased thermal conductive losses but also enhanced microbial activity, resulting in an overall increase in total heat unit. When biochar was applied on the surface, it mainly functioned as an insulator.
Article
Engineering, Environmental
George Tsalis, Birger Boutrup Jensen, Jessica Aschemann-Witzel
Summary: This paper empirically explores the relationship between retail price promotions and household food waste. The results show that households with a higher proportion of discount food purchases and environmental awareness tend to waste less food, while larger households and those lacking food handling skills tend to waste more food.
Article
Engineering, Environmental
Lukas Friederici, Arne Koch, Patrick Martens, Jana Pantzke, Sebastiano Di Bucchianico, Thorsten Streibel, Christopher P. Rueger, Ralf Zimmermann
Summary: The increasing demand for lightweight materials has led to a rise in fiber-reinforced plastic (FRP) production. However, the properties and compositional range of FRPs pose challenges to recycling strategies. Pyrolysis has emerged as a promising method for separating the fibers from the polymer matrix. This study investigated the pyrolysis process using thermal analysis and high-resolution mass spectrometry, and also assessed the toxicity of the recovered fibers using an in vitro model.
Review
Engineering, Environmental
Devika Kannan, Shakiba Khademolqorani, Nassibeh Janatyan, Somaieh Alavi
Summary: This paper introduces Smart Waste Management (SWM) that applies Industry 4.0 technologies in waste management. A framework called SWM4.0 is developed, which highlights the importance of smart people, smart cities, smart enterprises, and smart factories in achieving successful waste management. The paper also suggests future research directions and managerial implications.