Biochar for sustainable construction industry

Li, Huanyu; Wang, Lei; Zhang, Yuying; Yang, Jian; Tsang, Daniel C.W.; Mechtcherine, Viktor

doi:10.1016/b978-0-323-91873-2.00015-7

Cited by 10 publications

(4 citation statements)

References 122 publications

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“…However, to ensure mathematical validity, the comparison matrix must exhibit consistency. Saaty [73] introduced a method for analytically assessing the consistency of the matrix, known as the Consistency Index (CI), which is calculated according to Equation (6).…”

Section: • Ahp Methodsmentioning

confidence: 99%

“…Despite its widespread use, the environmental impact of concrete production cannot be ignored, especially concerning one of its key components: the cement. The production of cement is responsible for 5-8% of total CO 2 emissions every year due to the enormous demand for this material in various structures, such as bridges or dams [3][4][5][6]. This has led to a growing emphasis on the sustainability of concrete materials, driven by the urgent need to optimize resource utilization and minimize its environmental footprint.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Analysis of Multi-Criteria Decision Making and Life Cycle Assessment Methods for Sustainable Evaluation of Concrete Mixtures

Moro

2023

Sustainability

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In previous literature, multi-criteria decision-making (MCDM) methods and life cycle assessment (LCA) methods, integrating different properties, have been applied to cementitious materials separately. This study addresses the existing gap in the research by comparing LCA methods with durability parameters integrated and MCDM methods in concrete mixtures. The aim is to assess the differences between these two approaches when assessing the overall sustainability of cementitious materials. Concrete mixtures containing conventional and recycled materials, such as supplementary cementitious materials (SCMs) and recycled concrete aggregate (RCA), are evaluated based on their mechanical properties, durability parameters, environmental impact, and cost. The results highlight the positive impact of SCM usage on concrete performance and emphasizes the importance of reducing cement content for sustainability. Careful RCA utilization is crucial due to the variable outcomes when combined with SCMs. The results also exhibit that various MCDM methods show acceptable differences when ranking concrete mixtures, offering flexibility in property weighting for concrete applications. In contrast, different LCA methods with durability integrated yield higher differences, emphasizing the superior consistency of MCDM methods. The sensitivity analysis highlights the significance of weight methods and concrete parameters. Standardizing procedures for specific concrete applications is recommended to ensure the reliability and relevance of results.

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Section: • Ahp Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Multi-Criteria Decision Making and Life Cycle Assessment Methods for Sustainable Evaluation of Concrete Mixtures

Moro

2023

Sustainability

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“…Cement and concrete composites are crucial materials in the construction of modern society, since they are extensively used in numerous engineered structures such as bridges, roads, ports, dams, tunnels, and large and high-rise residential buildings [1][2][3]. In 2019, the worldwide production of cement is estimated to reach nearly 4.1 Gt [4,5], making it the second most widely used material on earth after water [6].…”

Section: Introductionmentioning

confidence: 99%

Influence of electrophoretic deposition of micro- or nanosized silica particles on the microstructure of carbon fibers and their bond behavior with cementitious matrices

Li,

Liebscher,

Yang

et al. 2024

Mater Struct

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The application of carbon fiber (CF) reinforced cementitious composites is often restricted by the poor load transfer between the components. In this study, two reactive coating materials—nano-silica and micro-silica—are utilized to modify the CF surfaces via an electrophoretic deposition approach. These negatively charged particles are able to be electrosorbed onto the fiber surfaces under a constant electrical field according to the zeta and cyclic voltammetry measurements. After surface treatment, XRD analysis of CFs showed an increase in graphite crystallite thickness and decrement in interlayer spacing $${d}_{002}$$ d 002 , significantly affecting the fiber diameters. Additionally, the lengths of crystallites were reduced, which can impair the fiber strength and their temperature stability. Single fiber pullout tests exhibited that the interfacial bonding can be clearly enhanced by both reactive coatings. Microscopic observation revealed that C–S–H gel and calcite structures can be formed near the fiber surfaces after immersion in cement pore solution owing to pozzolanic reaction and nucleation effect, tremendously heightening both chemical and mechanical interaction between fiber and cement. Finally, based on a detailed micromechanical analysis, the reinforcing mechanisms between the differently modified fibers and the cementitious matrix were elaborated and discussed. Graphical abstract

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“…Cement production is a major emitter of greenhouse gas (GHG) emissions and is responsible for about 5-8% of all CO 2 emissions worldwide (Schneider, 2019, IEA, 2018. This substantial environmental impact is attributable to the widespread use of cement, particularly in infrastructure projects like buildings, bridges and dams (Andrew, 2018, Turner and Collins, 2013, Li et al, 2023. It primarily releases GHGs like CO 2 and NO x, as burning coal is a major contributor to these GHG emissions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Ranking of Cement Alternatives in South Africa Using Combine Life Cycle Assessment and Multi- criteria Decision-Making Methods

Ige,

Von Kallon,

Desai

2024

Preprint

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Choosing the most suitable alternatives can be challenging in process engineering. Typically, there is a need to evaluate and rank alternatives using various criteria, such as environmental impact, when making decisions. This paper employs a novel integration of Life Cycle Assessment (LCA) and Multi-Criteria Decision-Making (MCDM) methods to evaluate the sustainability of different cement alternatives in South Africa. The LCA assesses the environmental impact, considering 18 midpoint categories, while Complex Proportional Assessment (COPRAS) and Additive Ratio Assessment (ARAS) methods were used as MCDA methods to rank and select the best alternatives. Across 18 impact categories, including global warming, ozone depletion, ecotoxicity, and resource scarcity, CEM I cement exhibited notable global warming emissions, ranking fourth. COPRAS and ARAS methods systematically ranked alternatives based on impact categories, consistently identifying CEM II/B-V cement as the most preferred alternative. This top ranking was attributed to its low environmental impact and high utility score. Notably, CEM III/A cement, despite low global warming emissions, ranked least preferred due to concerns about raw material-related environmental impacts. The paper highlights environmental hotspots for each cement type and underscores the importance of sustainable fuel and raw material selection in production. The results emphasize the necessity of reducing clinker content, exploring alternative fuels and raw materials, and adopting interventions like carbon capture and storage to enhance sustainability in cement production. The paper concludes that the integrated LCA and MCDM approach provides valuable insights for decision-makers in the cement industry, aiding the pursuit of more sustainable practices and calling for further research on the environmental impact of specific raw materials and fuels.

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Biochar for sustainable construction industry

Cited by 10 publications

References 122 publications

Comparative Analysis of Multi-Criteria Decision Making and Life Cycle Assessment Methods for Sustainable Evaluation of Concrete Mixtures

Comparative Analysis of Multi-Criteria Decision Making and Life Cycle Assessment Methods for Sustainable Evaluation of Concrete Mixtures

Influence of electrophoretic deposition of micro- or nanosized silica particles on the microstructure of carbon fibers and their bond behavior with cementitious matrices

Evaluation and Ranking of Cement Alternatives in South Africa Using Combine Life Cycle Assessment and Multi- criteria Decision-Making Methods

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