Article
Engineering, Environmental
Wasim Malek, Reza Mortazavi, Catia Cialani, Jonas Nordstrom
Summary: Waste management policies aim to redirect waste to more sustainable methods such as energy recovery and recycling. This study analyzed data from 14 European countries from 1996 to 2018 and found that landfill bans led to a decrease in landfill waste but an increase in incineration, energy recovery, and recycling waste. The landfill tax was associated with an increase in energy recovery waste but a reduction in incineration and recycling waste. The deposit refund scheme was linked to a decrease in landfill waste. Furthermore, both the landfill tax and the deposit refund scheme were correlated with a reduction in total waste generated. These findings contribute to the limited literature on waste management policies and provide valuable insights for policy makers.
Review
Construction & Building Technology
Navdeep Singh, Akhil Singh, Nitin Ankur, Parveen Kumar, Mahesh Kumar, Tarun Singh
Summary: The demand for concrete has increased due to urbanization and development, leading to concerns about the depletion of natural resources. Researchers have been working on innovative materials to replace conventional aggregates without compromising concrete performance. This article critically reviews the literature on the influence of recycled concrete aggregate (RCA) and iron slag (IS) as replacements for natural aggregates. The review provides insights into the properties of concrete and the potential of these alternative materials.
JOURNAL OF BUILDING ENGINEERING
(2022)
Review
Construction & Building Technology
Yunhui Pu, Lang Li, Qingyuan Wang, Xiaoshuang Shi, Chenchen Luan, Guomin Zhang, Ling Fu, Abd El-Fatah Abomohra
Summary: This paper summarizes the reaction processes, influencing factors, and mechanisms of accelerated carbonation for treating RCAs and evaluates the quality of carbonated RCAs and properties of concrete incorporating them. The environmental impacts and economic feasibility of this technique are also analyzed, showing improved mechanical properties and durability of concrete containing carbonated RCAs. This technology is considered environmentally friendly and economically feasible.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Green & Sustainable Science & Technology
Jeonghyun Kim
Summary: Construction and demolition waste in South Korea accounts for half of annual waste, and is expected to increase due to outdated structures and reconstructions. Limited land area and mountainous terrain restrict landfilling, making recycling of construction waste urgent. Stakeholders in South Korea are making efforts to practically use construction waste, which can serve as valuable examples for countries lacking waste management systems.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2021)
Article
Construction & Building Technology
Zhiming Ma, Jiaxin Shen, Changqing Wang, Huixia Wu
Summary: This study proposes an innovative method to crush recycled coarse aggregate into recycled manufactured sand, which can be used to prepare high-quality recycled mortar with high strength and good durability. The recycled manufactured sand has superior properties compared to recycled fine aggregate, and can significantly improve the performance of recycled mortar.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Computer Science, Interdisciplinary Applications
Lingling He, Hongping Yuan
Summary: This paper investigates the impact of value-added tax refund policies on enterprise's cross-regional recycling decisions. Game theory based models are used to analyze optimal decisions. The findings suggest that moderate transportation costs and market capacity differences should encourage cross-regional production, while moderate market capacity and high refund rates promote better outcomes for enterprises in cross-regional production scenarios. Additionally, increasing refund rates may not always be necessary as it can decrease profits in the current region.
COMPUTERS & INDUSTRIAL ENGINEERING
(2022)
Article
Construction & Building Technology
Duy-Hai Vo, Mitiku Damtie Yehualaw, Chao-Lung Hwang, Min-Chih Liao, Khanh-Dung Tran Thi, Yu-Fan Chao
Summary: Blending recycled coarse aggregate following the DMDA method led to an optimal proportion of 40% RCA content, which exhibited the highest strength and durability among the mixtures tested. The RAC mixtures with low cement consumption showed good strength development and durability up to 120 days of curing.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Marta Roig-Flores, Lucia Reig, Vicente Albero, David Hernandez-Figueirido, Antonio Melchor-Eixea, Angel M. Pitarch, Ana Piquer
Summary: This study focuses on reusing ceramic tile waste in concrete to promote sustainable construction practices and circular economy by reducing natural resource consumption.
Article
Construction & Building Technology
Sanchit Gupta, Harshit Agrawal, Sandeep Chaudhary
Summary: This study investigates the effects of thermo-mechanical treatment on mixed recycled aggregates (MRA). By heating MRA between 300°C and 800°C, followed by 100 abrasion cycles, six treated aggregates were prepared. The thermomechanical treatment leads to loss in the adhered mortar and improves the aggregate's crushing, impact, and abrasion values up to 700°C. Concrete prepared with MRA treated at 700°C exhibits higher workability (166.67%) and comparable mechanical strength (compressive: 93.72%, flexural: 99.94%, split tensile: 97.87%) compared to natural aggregates. Sustainability assessment shows that treating MRA with renewable energy can achieve lower economic costs (89.36%) and carbon emissions (58.05%) compared to manufacturing natural aggregates.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Junhui Zhang, Cheng Li, Le Ding, Jian Li
Summary: This study experimentally investigated the performance of cement-stabilized recycled mixture, revealing that the mechanical properties of cement-stabilized mixtures change with the proportion of recycled aggregate. The conclusion suggests that in road construction, the amount of recycled aggregate should not exceed 50%, and the ratio of crushed brick to recycled concrete aggregate should not exceed 3:7.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Bruno Wenzel, Marion Bustamante, Pedro Munoz, Jose Marcos Ortega, Estefania Loyola, Viviana Letelier
Summary: Many countries are using recycled concrete aggregates (RCA) as an alternative to reduce the use of natural resources. However, the quality of the old mortar on the RCA limits its use as a replacement for natural aggregates (NA) in concrete. This study investigates the use of RCA coated with recycled binder paste (RBP) to strengthen weak adhered mortar and improve the properties of the RCA. The results show that the coated RCA performs better in terms of mechanical and physical properties compared to the untreated RCA.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Xue-Fei Chen, Chu-Jie Jiao
Summary: This study examines the properties of nano-silica improved recycled aggregates (NS-RAs) and concrete containing these aggregates. The results show that soaking RAs in a 2% concentration of nano-silica can effectively reduce their crushing index and increase the compressive strength of concrete.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Monthian Setkit, Satjapan Leelatanon, Thanongsak Imjai, Reyes Garcia, Suchart Limkatanyu
Summary: This article experimentally and analytically studied the shear strength of reinforced recycled aggregate concrete beams without stirrups. It was found that the shear stresses of RAC beams with certain replacement percentage and longitudinal reinforcement ratio were similar to those of NAC counterparts. It was proposed to apply a reduction factor of 0.75 to the current ACI code equation for an RCA replacement ratio of between 50% and 100% to account for physical variations of RCA.
Article
Materials Science, Multidisciplinary
Yasin Onuralp Ozkilic, Ali Ihsan Celik, Ufuk Tunc, Memduh Karalar, Ahmed Deifalla, Thamer Alomayri, Fadi Althoey
Summary: The influence of waste glass aggregate (WGA) with fly ash in certain proportions on geopolymer concrete (GPC) was studied by varying the molarity and WGA proportion. Tests on workability, setting time, compression strength (CS), splitting tensile (ST), and flexural strength (FS) were performed, and the results showed that slump values increased with higher molarity and lower WG percentages. CS, ST, and FS tended to decrease with increasing proportion, but increased with higher NaOH molarity. An equation was derived to predict the compressive strength of the geopolymer mixture used in this study.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Khaldoun N. Rahal, Khalad Elsayed
Summary: The study investigated the shear behavior of concrete beams containing recycled coarse aggregates (RCA), finding that the use of RCA did not change the mode of failure or directly affect critical diagonal failure cracks. The recycled aggregate concrete (RAC) beams had higher normalized shear strength compared to natural aggregates concrete (NAC) beams, with a limited difference in strength amongst the various percentages of replacement (PR). Calculated strengths based on various codes were found to be conservative for the RAC beams.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)