Utilization and life cycle assessment of low activity solid waste as cementitious materials: A case study of titanium slag and granulated blast furnace slag

Tao, Ming; Dao-ming, LU; Shi, Ying; Wu, Chengqing

doi:10.1016/j.scitotenv.2022.157797

Cited by 24 publications

(2 citation statements)

References 45 publications

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“…In recent years, some by-products from other industries which are regarded as wastes have been widely used in the construction sector. These industrial wastes are used as cement replacement materials in concrete [25,26]. Among them, fly ash (FA), blast furnace slag (BFS) and limestone powder (LP) are favored by researchers due to their unique characteristics [27].…”

Section: Introductionmentioning

confidence: 99%

Assessment of self-healing performance of cement-based materials incorporating ion chelator and industrial wastes

Wang,

Yu,

Liu

et al. 2024

Smart Mater. Struct.

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Ion chelator can enhance the self-healing of cracks and pores in concrete. To further improve the self-healing capability of cement-based materials, different industrial wastes (i.e., fly ash, limestone powder and blast furnace slag) and ion chelator were mixed into mortar. The crack closure index, water permeability, water absorption, impermeability, compressive strength recovery and healing products of mortar were studied. The results showed that the mortar mixed with blast furnace slag (BFS) and ion chelator possessed the best repair ability on cracks, the crack with a maximum width of 0.55 mm can be closed within 14 d. Meanwhile, the water permeability and water absorption of mortar incorporating ion chelator and BFS were obviously smaller than that of control mortar. After curing for 56 d, the chloride diffusion coefficient of mortar containing ion chelator and BFS was reduced by 73.7% compared with control mortar. The compressive strength recovery ratio of mortar containing ion chelator and BFS was 63.7% greater than that of control mortar after pre-loading 80% of the failure strength. In addition, scanning electron microscopy and energy dispersive spectroscopy displayed a large number of calcites at the edge of crack section in mortar containing ion chelator and BFS, the inside of crack was mainly repaired by the combined effect of calcium carbonate precipitation and hydration product.

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Section: Introductionmentioning

confidence: 99%

Assessment of self-healing performance of cement-based materials incorporating ion chelator and industrial wastes

Wang,

Yu,

Liu

et al. 2024

Smart Mater. Struct.

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“…It is common to produce structural materials using solid wastes [ 5 , 6 , 7 ]. Due to the high chlorine ion content in TETS, the chloride binding capacity of the gelling has become the focus of attention when it is applied as a resource, but there is rarely any study on the binding of chloride ions in TETS until now.…”

Section: Introductionmentioning

confidence: 99%

Influences of Friedel’s Salt Produced by CaO-Activated Titanium-Extracted Tailing Slag on Chloride Binding

et al. 2023

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Titanium-extracted tailing slag (TETS) has high activity, but the content of chloride ions is high. To effectively bind the chloride ions, CaO was used to activate the TETS, and the solidified cementitious material of CaO-activated TETS was prepared. The effects of CaO content and curing age on the strength of solidified samples, chloride binding capacity, and chloride binding mechanism were studied. By means of XRD, FTIR, SEM, and EDS, the hydration reaction products, microstructure, morphology, and micro-components of the solidified sample were characterized. The results show that the chloride ions can be effectively bound by using CaO to activate TETS with higher mechanical strength. When the CaO content is 10 wt%, the strength of the 28-day-cured body can reach more than 20 MPa, the chloride ion binding amount is 38.93 mg/g, and the chloride binding rate is as high as 68%. The new product phases of the solidified sample are mainly Friedel’s salt (FS) and calcite, in which the amount of FS production and the degree of crystal development are affected by the CaO content and curing age. The chloride binding ions in the solidified sample are mainly the chemical binding by FS. The FS diffraction peak strength increases with the increase of CaO content and curing age, but the calcite diffraction peak strength is less affected by them. FS mainly accumulates and grows in the pores of the solidified sample. It can optimize the pore structure of the solidified sample and improve the strength of the solidified sample while binding chloride ions. The results can provide useful information for the resource utilization of chlorine-containing TETS, the improvement of durability of Marine concrete, and the application of sea sand in concrete.

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Carbon emissions mitigation methods for cement industry using a systems dynamics model

Ige,

Von Kallon,

Desai

2024

Clean Techn Environ Policy

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Cement production contributes significantly to anthropogenic greenhouse gas emissions (GHG), a major contributor to global carbon emissions. The environmental impacts of cement production have grown in recent years and it is urgent to reduce its carbon footprint. Systems dynamics (SD) is a simulation method used to understand the nonlinear behavior of complex systems over time. It is commonly used in various sectors to predict emissions and conduct policy experiments. Due to the poor implementation of carbon mitigation strategies within the cement industry, enhancing policymaking by employing more advanced decision-support tools is necessary. This paper reviews previous studies that use the SD approach to assess and compare different mitigation strategies proposed and implemented to reduce carbon emissions in the cement industry. These strategies encompass technological advancements and process improvements, including using alternative fuels and raw materials (adopting low-carbon cementitious materials), energy efficiency improvements, carbon capture and storage and waste heat recovery. The review examines the papers' scope, model descriptions, validation method and mitigation methods highlighted in each study, providing valuable insights for decision makers in the cement industry. Furthermore, the paper discusses the limitations and gaps related to SD modeling, highlighting important factors such as stakeholder engagement in designing effective carbon mitigation strategies. The reviewed studies constantly emphasized technical strategies for mitigating carbon emissions from the cement industry, as stated by the International Energy Agency (IEA) classification. Innovative and emerging technologies, such as WHR, depends on adequate funding, motivation and research and development. However, they frequently neglected to address the barriers hindering their implementation or provide detailed policy measures to overcome them using SD. Additional research is required to assess the practicality and costs of implementing these strategies. Graphical abstract Navigating the way to sustainability in the cement industry: Exploring mitigation strategies through systems dynamics model

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Utilization and life cycle assessment of low activity solid waste as cementitious materials: A case study of titanium slag and granulated blast furnace slag

Cited by 24 publications

References 45 publications

Assessment of self-healing performance of cement-based materials incorporating ion chelator and industrial wastes

Assessment of self-healing performance of cement-based materials incorporating ion chelator and industrial wastes

Influences of Friedel’s Salt Produced by CaO-Activated Titanium-Extracted Tailing Slag on Chloride Binding

Carbon emissions mitigation methods for cement industry using a systems dynamics model

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