Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Zhang, Tong; Chen, Meng; Wang, Yuting; Zhang, Mingzhong

doi:10.1016/j.cemconcomp.2023.104994

Cited by 67 publications

(10 citation statements)

References 173 publications

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“…Firstly, the heterogeneity of the wastes introduces unpredictability in the carbonation process and the performance of the resulting products, making their utilisation a considerable challenge. Variations in the properties of carbonated wastes and subsequently the cement properties incorporating them have been extensively discussed in various review articles 58,59 . Secondly, much of the research is conducted under aggressive conditions with pure CO 2 gases to accelerate the carbonation rate.…”

Section: Toward Large-scale Ccus Of Alkaline Wastes In Sustainable Ce...mentioning

confidence: 99%

Maximising the benefits of calcium carbonate in sustainable cements: opportunities and challenges associated with alkaline waste carbonation

Jin,

Zhao,

et al. 2024

npj Mater. Sustain.

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Cement production significantly contributes to global climate change and implementation of carbon capture, utilisation and storage (CCUS) in construction materials is considered a crucial step toward achieving net-zero emissions. Substituting Portland cement (PC) clinker with limestone has been demonstrated to effectively reduce CO2 emissions while enhancing the properties of cement and concrete. Beyond limestone extraction, quarrying, and crushing, various types of alkaline waste materials generated from industrial processes can serve as valuable resources for producing diverse forms of calcium carbonate, simultaneously capturing a substantial amount of CO2. In this context, we contend that due to the distinct characteristics of various calcium carbonate forms, there exists the substantial potential to maximise their technical, economic, and environmental advantages in the production of sustainable cements. We reviewed existing studies of the effects of different calcium carbonate forms on cement properties and underscored the viability of utilising various alkaline wastes to produce different calcium carbonate products. As a promising approach for CO2 reduction, waste management, and resource recovery, we addressed the opportunities and challenges associated with advancing CCUS through the utilisation of carbonated alkaline wastes in sustainable cements. To achieve real-world impacts, we emphasised the necessity for interdisciplinary research collaborations, active involvement from industry stakeholders, regulatory bodies, and governmental support to facilitate the large-scale adoption of these innovative practices.

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Section: Toward Large-scale Ccus Of Alkaline Wastes In Sustainable Ce...mentioning

confidence: 99%

Maximising the benefits of calcium carbonate in sustainable cements: opportunities and challenges associated with alkaline waste carbonation

Jin,

Zhao,

et al. 2024

npj Mater. Sustain.

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“…Furthermore, the production process of recycled aggregates is typically more energy efficient and emission reducing compared to the production process of natural aggregates, significantly reducing the carbon emissions associated with concrete. T. Zhang et al [66] mentioned that the use of carbonized solid waste in mortar and concrete can significantly reduce CO 2 emissions, and 2035.4 Mt CO 2 emissions can be reduced in one year in the Asia-Pacific region alone. The data of typical countries are shown in Table 1.…”

Section: Sustainabilitymentioning

confidence: 99%

“…Table 1. The CO 2 emissions reductions from the use of carbonized solid waste in mortar and concrete in typical countries [66].…”

Section: Sustainabilitymentioning

confidence: 99%

Modification of Recycled Concrete Aggregate and Its Use in Concrete: An Overview of Research Progress

Su,

Yao,

Wang

et al. 2023

Materials

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The differences in physical properties, chemical properties, and mechanical properties between reclaimed concrete aggregate and natural aggregate are discussed in this paper. In this paper, the commonly used improvement techniques of recycled concrete aggregate are reviewed. Physical modification involves peeling the attached mortar layer using mechanical and thermodynamic means, including mechanical grinding and shaping, heat treatment, and microwave or electric pulse treatment. Chemical modification is based on the chemical reaction of some materials with recycled aggregate attached mortar, including acid treatment removal, water glass strengthening, carbonation strengthening, inorganic slurry strengthening, and polymer strengthening. Microbial modification is mainly based on the metabolic activity of specific microorganisms that induce carbon deposition modification. The results show that the reinforced technology of recycled aggregate has made some progress in improving the performance of recycled aggregate, but there are still some problems, such as inconsistent strengthening effects and the unstable compatibility of composite materials. In this paper, future research directions, such as the development of new strengthening materials and the integration of multi-functional strengthening technology, are described in order to provide some theoretical support for the utilization of recycled concrete aggregate.

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“…Specifically, the carbonation process is influenced by the characteristics of the parent material of recycled aggregates, including particle size, porosity, moisture content, and the carbonation method and conditions, such as CO2 concentration, gas pressure, carbonation reaction time, relative humidity, and temperature. The carbonation mechanism of recycled aggregates can be described by the diffusion-dissolution-carbonation reaction process, as shown in Figure 6 [27]. The carbonate layer can fill the pores and microcracks on the surface of particles, improving the compactness and strength of recycled aggregates.…”

Section: Carbonation Reinforcement Of Adhesive Mortarmentioning

confidence: 99%

Modification of Recycled Concrete Aggregate: An Overview of Research Progress

Su,

Yao,

Wang

et al. 2023

Preprint

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The performance of recycled aggregate concrete deteriorates due to the defects of adhesive mortar, pores and cracks on the surface of recycled aggregate. It is of great engineering significance to modify the reclaimed aggregate to improve its performance and adaptability. In this paper, the physical and chemical properties of waste concrete recycled aggregate are reviewed. Then, the existing modification methods and technologies of recycled aggregate, including physical, chemical and biological methods, are reviewed. Finally, the existing problems of the current modification technology are summarized, and the future research direction is proposed. It is expected to provide a new idea and method for the modification of waste concrete recycled aggregate.

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Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Cited by 67 publications

References 173 publications

Maximising the benefits of calcium carbonate in sustainable cements: opportunities and challenges associated with alkaline waste carbonation

Maximising the benefits of calcium carbonate in sustainable cements: opportunities and challenges associated with alkaline waste carbonation

Modification of Recycled Concrete Aggregate and Its Use in Concrete: An Overview of Research Progress

Modification of Recycled Concrete Aggregate: An Overview of Research Progress

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