Article
Chemistry, Physical
Maria Borrachero, Jordi Paya, Santiago Brito, Yasna Pamela Segura, Lourdes Soriano, Mauro M. Tashima, Jose Maria Monzo
Summary: Construction and demolition waste can be recycled and utilized by alkali-activated cement to improve sustainability and recovery. In this study, the physical and chemical characteristics of construction and demolition waste in Valencia were described, with the main components being CaO, SiO2, and Al2O3. The alkali activation of blends of this waste and blast furnace slag resulted in mortars with high compressive strength. The research concludes that new sustainable binders can be made without the use of Portland cement.
Article
Chemistry, Multidisciplinary
David Suescum-Morales, Lorenzo Salas-Morera, Jose Ramon Jimenez, Laura Garcia-Hernandez
Summary: This article introduces a novel method using artificial neural network model to predict the compressive strength of recycled aggregate concrete, demonstrating its efficiency in dealing with heterogeneous and noisy data through different training methods and a large dataset of concrete mixes.
APPLIED SCIENCES-BASEL
(2021)
Article
Green & Sustainable Science & Technology
Sami W. Tabsh, Yazan Alhoubi
Summary: This study investigated the potential of using locally produced recycled fine aggregate in new concrete mixes to replace sand. Results showed that the recycled fine aggregate has cementitious properties and can match or exceed the compressive and tensile strength of concrete made with virgin aggregate in certain cases.
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
Green & Sustainable Science & Technology
Yunpeng Zhao, Dimitrios Goulias, Luca Tefa, Marco Bassani
Summary: The study aims to quantitatively assess the life cycle economic and environmental benefits of using alternative stabilized-CDW aggregates in pavement construction. The results indicate that using CDW aggregate stabilized with CKD can lead to cost savings and environmental benefits, encouraging wider adoption in roadway construction. The analysis approach in this study can be applied to assess the benefits of recycled materials in roadway infrastructure in other locations.
Article
Chemistry, Multidisciplinary
Vitor Sousa, Jose Alexandre Bogas, Sofia Real, Ines Meireles, Ana Carrico
Summary: The concrete industry is committed to reducing its excessive carbon footprint, specifically through reducing clinker production. Recycled cement (RC) from the thermoactivation of hardened cement waste at low temperature shows great potential in reducing the clinker factor, reusing construction and demolition waste, and minimizing natural resource consumption. This study models the energy consumption and carbon emissions of RC production using a newly patented separation method. Results indicate that the air method (AM) and dry method (DM) significantly reduce energy consumption compared to the wet method (WM). Adopting AM or DM can lower RC's energy consumption by 30%-40% compared to clinker production, resulting in estimated carbon emission savings up to 80%.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Construction & Building Technology
S. Tejas, Dinakar Pasla
Summary: The decade from 2014 to 2024 is the sustainable decade, which requires the development of eco-friendly building materials and the adoption of sustainable construction practices. The use of more industrial by-products reduces the environmental carbon footprint of cement manufacturing. As the demand for natural aggregates increases, recycled aggregates or recycled concrete coarse aggregates are being used as alternatives. However, there is a lack of research on the use of composite cement and 100% recycled concrete aggregates. This study developed composite cement-based, recycled aggregate concrete and evaluated its mechanical and durability properties.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Anil Kul, Behlul Furkan Ozel, Emircan Ozcelikci, Muhammed Faruk Gunal, Huseyin Ulugol, Gurkan Yildirim, Mustafa Sahmaran
Summary: The study aims to develop a fast, cost-effective, and eco-friendly solution for recycling construction and demolition waste (CDW) into building materials suitable for accelerated construction and housing in developing countries and disaster-prone areas. The feasibility of including recycled concrete aggregate (RCA) in geopolymer mortars entirely made from CDW was investigated. Mechanical performance and environmental impact of the geopolymer mortars were evaluated, showing that CDW-based geopolymer mortars provide the same compressive strength with reduced CO2 emissions and energy consumption compared to Portland cement-based mortars.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Jeonghyun Kim, Nader Nciri, Alena Sicakova, Namho Kim
Summary: The physical and chemical characteristics of recycled concrete powders (RCP) generated by repeated recycling of concrete were investigated, and their application as a partial replacement for cement in mortar was discussed. The study found that RCP became more porous, rough, and less dense with an increasing number of concrete recycling. The properties of mortar containing RCP decreased as a function of replacement ratio and the number of concrete recycling.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Huseyin Ulugol, Anil Kul, Gurkan Yildirim, Mustafa Sahmaran, Alper Aldemir, Diogo Figueira, Ashraf Ashour
Summary: Geopolymers are mainly produced using mainstream precursors like fly ash and slag. This study focuses on developing geopolymers with construction and demolition waste-based precursors, such as masonry units and glass, by testing different curing conditions and Na concentrations. The results show that hollow brick is the most successful precursor in terms of compressive strength, while geopolymers with glass precursor have lower strength performance.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Cheetirala Govardhan, Venkataraman Gayathri
Summary: This study examines the effects of incorporating recycled concrete aggregate (RCA), slag cement, alccofine, and glass fibers into concrete mixtures. The results demonstrate that the addition of RCA improves the mechanical properties of concrete, while the addition of glass fibers enhances the tensile and flexural performance. This study introduces a novel concept for the utilization of sustainable and high-performance components in concrete mixtures.
Article
Environmental Sciences
Manuel Contreras Llanes, Maximina Romero Perez, Manuel Jesus Gazquez Gonzalez, Juan Pedro Bolivar Raya
Summary: The study showed that using up to 50% of recycled aggregates from construction and demolition waste is feasible for manufacturing eco-friendly concrete, and can also be used to produce paving blocks that meet industrial standards. By reducing cement incorporation, production costs were saved and environmental impact minimized.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Jeonghyun Kim, Anna M. Grabiec, Andrzej Ubysz
Summary: This study evaluates the effects of different recycled concrete materials on the mechanical properties of concrete. The results show that the concrete properties deteriorate with increasing replacement ratio of recycled materials.
Article
Construction & Building Technology
Cuizhen Xue, Hongxia Qiao, Hui Cao, Qiong Feng, Qiong Li
Summary: The characteristics of brick powder particles have a significant impact on the strength of cement mortar, with the strength of mortar being significantly dependent on specific surface area and the fraction of particles smaller than 20 μm. Proper content of brick powder can increase the 28-day strength of cement mortar.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Suresh Palla, Prateek Sharma, M. V. Ramachandra Rao, S. Ramakrishna, Suresh Vanguri, B. N. Mohapatra
Summary: Gypsum is a key component in cement for controlling setting behavior, and chemical treatment of gypsum can improve cement setting performance, resulting in shorter setting time.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Aparna Harichandran, Benny Raphael, Abhijit Mukherjee
Summary: An hierarchical machine learning framework is proposed to improve the accuracy of identification of Automated Construction System (ACS) operations. The framework is tested on a laboratory prototype and outperforms the conventional approach, especially when identifying fine levels of operations. The versatility and noise tolerance of the hierarchical framework are also reported.
JOURNAL OF INFORMATION TECHNOLOGY IN CONSTRUCTION
(2021)
Article
Materials Science, Multidisciplinary
Asha Latha Ramachandran, Abhijit Mukherjee, Navdeep K. Dhami
Summary: Bacterial biopolymers produced extracellularly have gained significant interest in engineering applications. This study quantifies the mechanical properties of in-situ bacterial biopolymer dextran and reveals their cementation mechanism. The macro-mechanical properties of soils stabilized by bacterially produced biopolymers are comparable to commercial biopolymers. This research provides novel testing methods and applications for in-situ polymers.
FRONTIERS IN MATERIALS
(2022)
Article
Engineering, Environmental
Anant Aishwarya Dubey, Raja Murugan, K. Ravi, Abhijit Mukherjee, Navdeep K. Dhami
Summary: Biomediated soil improvement has emerged as a promising solution for enhancing soil engineering properties in the past decade. The efficacy of biocementation depends largely on the material properties of the precipitated crystals, which are influenced by the concentration of cementation reagents. In this study, specific microbes were investigated for their biocementation potential at different concentrations of cementation media (CM). The soil strength improvement was evaluated through a needle penetration test, and the biochemical properties of the microbes were analyzed to understand the reasons behind the variation in penetration resistance. The findings suggest that the concentration of CM plays a significant role in the response of microbes, and the morphology, texture, and quantity of precipitated CaCO3 crystals are important factors influencing the strength of the biocemented soil.
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE
(2022)
Article
Computer Science, Interdisciplinary Applications
Aparna Harichandran, Benny Raphael, Abhijit Mukherjee
Summary: This study proposes a framework called hybrid unsupervised and supervised machine learning (HUS-ML) for equipment activity recognition and fault detection. The framework identifies normal operations and known faulty conditions through supervised learning, and utilizes an anomaly detection algorithm to spot unseen faulty conditions. Experimental results demonstrate the superiority of HUS-ML in activity recognition and fault detection, with successful identification of known and unseen faulty operations.
COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Mechanical
Atri Nath, Sudhirkumar Barai, Kalyan Kumar Ray
Summary: This study examines a methodology that combines Chaboche's CIKH model and genetic algorithm optimization technique to simulate the cyclic-plastic response of materials exhibiting cyclic hardening or softening behavior. The results demonstrate the accuracy of this approach in predicting the experimental results for various materials and its comparability with existing predictions, validating its applicability.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Geological
Anant Aishwarya Dubey, Jack Hooper-Lewis, K. Ravi, Navdeep Kaur Dhami, Abhijit Mukherjee
Summary: The increased occurrence of extreme weather events has raised global concerns about the conservation of riverbanks and coastlines. This study explores the erosion characteristics of soil treated with microbially induced calcite precipitation (MICP) and investigates the effectiveness of biopolymer composite treatment in improving soil resilience against erosion.
Article
Construction & Building Technology
Abhijit Mistri, Navdeep Dhami, Sriman Kumar Bhattacharyya, Sudhirkumar Barai, Abhijit Mukherjee
Summary: Reutilising construction and demolition waste as aggregate in concrete is sustainable and prevents depletion of natural resources. Bio-treatment of recycled coarse aggregate has been shown to improve the drawbacks caused by attached mortar, and is more cost-effective than conventional cement slurry treatment.
MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Priyadarshini Das, Venkata Ravi Sankar Cheela, Abhijit Mistri, Sushanta Chakraborty, Brajesh Dubey, Sudhirkumar V. Barai
Summary: This paper investigates the techno-environmental sustainability of concrete utilizing ferrochrome slag and fly ash. The results show that by adopting an optimized mix design method, concrete with better performance and environmental savings can be achieved. Sensitivity analysis reveals that the studied concrete mix design is not sensitive to transportation distance, mode of transport, and energy mix.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yikuan Wang, Abhijit Mukherjee, Arnaud Castel
Summary: This paper proposes a combined electrochemical and ultrasonic method for monitoring incipient corrosion in reinforced concrete (RC), and experimental corrosion was induced by accelerated chloride. Through the use of four monitoring techniques and the analysis of results, the progression of corrosion and concrete cracking can be successfully identified and traced.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Abhijit Mistri, Navdeep Dhami, Sriman Kumar Bhattacharyya, Sudhirkumar Barai, Abhijit Mukherjee
Summary: The variable quality of recycled coarse aggregate (RCA), especially the attached mortars leading to weak interfaces, is a major drawback. This study investigates the strengthening of RCA using biocement treatment and compares it with conventional cement slurry treatment. The effects of the treatments on water absorption and mechanical properties of the aggregates are recorded. A novel method of fabricating concrete cubes with one aggregate is developed to study the concrete-aggregate interface. Advanced monitoring techniques are used to record damage evolution at the interfaces. Microstructural behavior and elemental composition in the interface are also recorded. The test results show that biocement treatment reduces the water absorption of RCA by about 71%. Microstructural study demonstrates that biocement can penetrate the porous interfacial mortar within RCA and densify it due to its low viscosity. The micromechanical properties using nanoindentation provide more insights into improving interfacial transition zones. The treatment improves the aggregates to a level where they can replace natural aggregates without compromising performance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Abhijit Mistri, Venkata Ravi Sankar Cheela, Brajesh Kumar Dubey, Navdeep Dhami, Sriman Kumar Bhattacharyya, Abhijit Mukherjee, Sudhirkumar Barai
Summary: This article compares the environmental impacts of different treatment methods on recycled coarse aggregate (RCA) and aims to find the most suitable method with minimum impacts.
WASTE MANAGEMENT & RESEARCH
(2023)
Article
Construction & Building Technology
Yikuan Wang, Abhijit Mukherjee, Arnaud Castel
Summary: This study proposes a non-destructive method based on guided ultrasonic waves to monitor corrosion in reinforced concrete with top-bar defect. Through accelerated corrosion experiments and monitoring with guided ultrasonics, the research reveals that top-bar defect significantly influences the corrosion process, and specimens with defects have a significant loss of strength after corrosion exposure.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Nimrat Pal Kaur, Yikuan Wang, Navdeep Kaur Dhami, Abhijit Mukherjee
Summary: Bacterial biocementation has the ability to heal cracks in concrete, but there is a concern about the potential corrosion caused by the materials used. This paper examines the performance of bacterially healed reinforced concrete when exposed to chloride-induced corrosion. Different calcium sources were used for the healing process, and electrochemical techniques and ultrasonic-guided waves were used to assess the state of corrosion. The study found that the presence of electrolytes in the healing fluid affected the electrochemical measurements and gave misleading results, but the ultrasonic-guided waves method provided an accurate assessment of corrosion.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Engineering, Environmental
Yui Kawasaki, Sayaka Nagao-Sato, Misa Shimpo, Kahori Fujisaki, Emi Yoshii, Rie Akamatsu, Petra Warschburger
Summary: This study qualitatively describes sustainable dietary behaviors (SDBs) that Japanese and German adults can implement in their lives, and quantitatively compares the similarities and differences in understanding SDBs between the two samples. The study found that Japanese participants were more focused on food waste prevention, while German participants were more focused on solving environmental problems.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kechun Chen, Yuan Ding, Liming Yang, Zhihao Wang, Haoxuan Yu, Difan Fang, Yufa Feng, Liying Hu, Chenxi Xu, Penghui Shao, Xubiao Luo, Liang Chen
Summary: This study proposes a targeted repair scheme for the recovery of graphite anodes from spent LIBs by systematically characterizing and analyzing the structure and composition of spent graphite (SG). The results show that the repair scheme achieves effective SG repair and the repaired graphite anode displays excellent lithium storage performance.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Takao Ueda, Shigeki Koyanaka, Tatsuya Oki
Summary: Fires caused by accidental crushing of batteries are a serious issue in the e-waste recycling process. A new in-line sorting system that uses X-ray scanning and deep learning has been developed to accurately detect batteries. Through a validation study, the system achieved higher accuracy compared to other existing programs.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Hannes Geist, Frank Balle
Summary: Research on circular economy often lacks empirical data, especially in the theory of circular process design and design for remanufacturing. This study systematically collected and analyzed engineering data on seven remanufacturing processes in the European automotive remanufacturing industry for the first time, providing empirical support for circular engineering challenges, potentials, and solutions.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Xiaojing Li, Fan Lue, Nanlin Liao, Hua Zhang, Na Yang, Pinjing He
Summary: This study assesses and predicts the greenhouse gas emissions on the timeline as waste treatment technologies develop in Shanghai from 1991 to 2025 using the Life Cycle Assessment (LCA) methodology. The findings demonstrate that GHG emission has reached net-zero in 2019 owing to the application of alternative technologies and waste segregation.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Bingchun Liu, Haoyang Wang, Xiaoqin Liang, Yibo Wang, Zijie Feng
Summary: The expansion of the photovoltaic market has resulted in a significant increase in PV waste. Therefore, conducting scientific research to determine the importance of the circular economy for sustainable growth in the PV industry is essential. The study demonstrates that accurate prediction of PV installed capacity and quantifying the importance of recycling in balancing the supply and demand of raw materials can be achieved through a multi-factor installed capacity prediction model and recovery potential prediction.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Review
Engineering, Environmental
Chuanzhen Zhang, Baojing Gu, Xia Liang, Shu Kee Lam, Yi Zhou, Deli Chen
Summary: Reactive nitrogen is crucial for agriculture and human nutrition, but mismanagement can have detrimental effects on human health and ecosystem services, hindering the achievement of the 2030 Sustainable Development Goals. Progress towards nitrogen-related targets varies across countries, highlighting the need for integrated management to achieve overall synergies.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Alessandro Gatto, Marijke Kuiper, Corina van Middelaar, Hans van Meijl
Summary: This study examines the economic and environmental effects of transitioning towards more circular food systems in the European Union (EU27) by feeding animals with low-opportunity-cost feed and better utilizing local feed resources. The results show that providing subsidies for circularity and promoting the use of low-cost feed can increase animal production, but also have negative impacts on land use and emissions. On the other hand, promoting domestic feed sourcing through import tariffs can decrease animal production and greenhouse gas emissions in agriculture. However, complementary policies are needed to mitigate drawbacks and enhance benefits of a more circular agri-food system.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Jinbo Zhang, Liu Chen, Yulei Xie, Pingjian Yang, Zheng Li, Huaicheng Guo, Yang Zhang, Lirong Liu
Summary: This study examines the impact of carbon taxes on low-carbon development and climate change mitigation. By constructing a cross-system bi-layer model, the study finds that reasonable carbon taxes can promote the stability of the energy network, reduce carbon emissions and air pollutants, and optimize production efficiency and the structure of the energy system. This study contributes to a better understanding of the effects and implementation pathways of carbon taxes.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Konstantin Born, Mehmet Metehan Ciftci
Summary: Increasing recycling of metals is important for reducing reliance on mining, but it cannot fully meet future metal demand. Primary production of metals is expected to continue rising, highlighting the need for alternative circular economy strategies such as demand reduction and mitigating harmful impacts of primary metal production.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Yinqiu Ma, Lin Huang, Jiahui Li, Wei Cao, Yumei Cai
Summary: Afforestation and reforestation, such as China's Grain for Green Program, have shown to effectively mitigate greenhouse gas emissions and contribute to carbon sink capacity. This study highlights the significant carbon potential of the program and its potential application in other countries to reduce CO2 in the atmosphere.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Arlind Dervishaj, Kjartan Gudmundsson
Summary: This paper reviews digital tools for supporting the Circular Economy (CE) in the built environment and provides suggestions. The study identifies limitations in the functionalities of current tools, including a lack of representative data for LCA and underdeveloped circularity indicators. Further development is needed in terms of interoperability aspects, integration of more sources of data for LCA and circularity, and possibilities for a comprehensive evaluation of design choices.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Mohamadreza Y. Azarfam, Anuj Maheshwari, Frank D. Blum, Siddhesh Chaudhari, Clinton Switzer, Ranji Vaidyanathan, Jay C. Hanan, Sudheer Bandla
Summary: This study introduces a feasible method for manufacturing recycled composites using post-consumer carpets and recycled resin. The resulting composites have impressive strength and modulus, surpassing commercial thermoplastics and making them suitable for structural applications. This research presents a promising approach to address carpet landfilling and reduce reliance on additives.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Pujiang Shi, Tianle Huang, Hong Kit Lim, Chiew Kei Tan, Jong-Min Lee, Chor Yong Tay
Summary: This study developed a highly porous bioadaptive 3D sponge-like construct from plastic materials in discarded keyboards for advanced in vitro applications. The findings demonstrate the potential of using discarded keyboards as a waste-to-resource feedstock to achieve waste reduction and maximize value-capture.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kuo-Jui Wu, Hailing Qiu, Caiyan Huang, Anthony S. F. Chiu, Ming-Lang Tseng
Summary: Government resource allocation practices for achieving carbon neutrality should be guided by dynamic system theory to identify potential dynamics. Carbon intensity control dynamics have a significant influence on other dynamics.
RESOURCES CONSERVATION AND RECYCLING
(2024)
