Accelerated carbonation treatment of recycled concrete aggregates using flue gas: A comparative study towards performance improvement

Pu, Yong; Li, Lang; Wang, Hongtao; Shi, Xiaoshuang; Fu, Lei; Zhang, Kevin; Luan, Chenchen; Abomohra, Abd El-Fatah

doi:10.1016/j.jcou.2020.101362

Cited by 65 publications

(19 citation statements)

References 44 publications

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“…It is a process based on the mineralization of industrial gas, especially CO 2 within portlandite and calcium silicate hydrates of RCA cement paste. In laboratory or industrial conditions, gas is in contact with RCA and the carbonation reaction, by the capture of CO 2 , leads to obtaining carbonated recycled concrete aggregates (CRCA) with improved qualities (clogging the porosity) 57–59 . A French National Project (FastCarb), aimed to transpose the accelerated carbonation at an industrial scale at a suitable economic and environmental cost 60 .…”

Section: Environmental Assessmentmentioning

confidence: 99%

“…In laboratory or industrial conditions, gas is in contact with RCA and the carbonation reaction, by the capture of CO 2 , leads to obtaining carbonated recycled concrete aggregates (CRCA) with improved qualities (clogging the porosity). [57][58][59] A French National Project (FastCarb), aimed to transpose the accelerated carbonation at an industrial scale at a suitable economic and environmental cost. 60 In addition to capturing CO 2 , by improving the mechanical properties of recycled aggregates, which are weaker than those of natural aggregates and potentially require the use of more cement in concrete, the environmental impact of concrete could be reduced.…”

Section: Co 2 Uptakementioning

confidence: 99%

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Sustainability assessment of recycled aggregate concrete structures: A critical view on the current state‐of‐knowledge and practice

Marinković

Josa

Braymand

et al. 2023

Structural Concrete

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The environmental impacts of activities such as raw material extraction, construction of infrastructure, and demolition, place construction as one of the sectors that exert the highest pressures on the environment, society, and economy. Some of the major environmental impacts for which the construction industry is responsible are mineral resource depletion, greenhouse gas emissions, and waste generation. Among the different strategies that exist to decrease such impacts, recycling demolition waste into recycled concrete aggregates has been considered a promising alternative. As such, at present, the literature dealing with the impact assessment of recycled aggregate concrete structures is very extensive. Therefore, the objective of this article is to present a critical view of the state-of-the-art in terms of sustainability assessment of recycled aggregate concrete structures, taking a holistic perspective by considering environmental, social, and economic impacts.

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Section: Environmental Assessmentmentioning

confidence: 99%

Section: Co 2 Uptakementioning

confidence: 99%

Sustainability assessment of recycled aggregate concrete structures: A critical view on the current state‐of‐knowledge and practice

Marinković

Josa

Braymand

et al. 2023

Structural Concrete

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“…The average concentration of CO 2 in flue gas is approximately 20%. [27,28] Hence, 20% CO 2 was chosen to understand the accelerated carbonation. A study by Drouet et al shows that the carbonation rate of CEM I increases linearly with temperature between 20 C and 80 C. [29] Further increase in temperature can lead to thermal cracking and decrease in carbonation.…”

Section: Exposure Environmentmentioning

confidence: 99%

Tracking spatiotemporal evolution of cementitious carbonation via Raman imaging

Srivastava

Garg

2022

J Raman Spectroscopy

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Carbonation of cementitious systems is an important phenomenon from both durability (rebar corrosion) and greenhouse emissions (CO2 sequestration) perspectives. Several analytical techniques are well‐established for measuring the kinetics of this dynamic phenomenon, ranging from measuring the pH change to quantifying the calcite content over time. However, the majority of these methods (with the exception of electron imaging) rely on bulk measurements which may miss the fine, microstructural changes that occur during carbonation. In this study, we investigate and evaluate the potential of Raman imaging to follow the spatiotemporal evolution of carbonation in cementitious pastes. By analysing mm‐scale maps (1 mm × 1 mm) at the micron‐scale resolution, we find that nearly ~40% of the sample surface was covered with calcite at the end of a 2‐week carbonation exposure. Simultaneously, the portlandite content declined from ~15% to 5% in the same period, suggesting portlandite consumption for the sake of calcite growth. Finally, the difference between the calcite growth rate and portlandite consumption rate strongly suggests simultaneous carbonation of CSH and ettringite—a finding that is in agreement with recent experimental investigations of carbonation kinetics. Overall, these new results on the spatiotemporal evolution of cementitious microstructure pave the way for utilizing Raman imaging for understanding dynamic phenomena in complex systems.

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“…Hence, for promoting the application of RAC, the quality of RCA should be improved firstly. At present, accelerated carbonation can not only improve the quality of RCA [6], but also can alleviate the greenhouse effect by absorbing CO 2 , therefore it has great application prospects in engineering field.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Compressive Stress-Strain Behaviour of Recycled Aggregate Concrete Prepared With Carbonated Recycled Concrete Aggregate

Wu¹

2022

Ceramics - Silikaty

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The influences of carbonated recycled concrete aggregate (CRCA) on the stress-strain behaviour of recycled aggregate concrete (RAC) were studied. Recycled concrete aggregate (RCA) pre-soaked in limewater was processed by accelerated carbonation for 24 h, whose pressure was 0.30 MPa. Four substitution ratios (0 %, 30 %, 70 %, 100 %) of the aggregate were utilised. RMT-150C rock mechanics test system (frame stiffness of 5 MN/mm, loading rate of 0.005 mm•s -1 ) was used to conduct the tests. The results showed that the failure modes of all specimens were shear failure, but the failure angles of RAC and CRAC (RAC prepared with CRCA) were larger than those of natural aggregate concrete (NAC), which were in the range of 63° -75° and 58° -64° respectively. As the substitution ratio of RCA increasing, the stress-strain curve of RAC gradually flattened, which meant its brittleness decreased. Moreover, its peak stress, elastic modulus, and peak strain decreased continuously, while its ultimate strain increased continuously. Compared with RAC, CRAC showed the similar stress-strain curve, but its brittleness was slightly higher. Furthermore, its peak stress, elastic modulus, and peak strain increased, while its ultimate strain decreased. Finally, based on linear regression analysis and relevant standards, the prediction models of peak stress, elastic modulus, peak strain, and ultimate strain, as well as the stress-strain constitutive models of RAC and CRAC were proposed, which had a good applicability to the test data. In conclusion, the stress-strain behaviour of CRAC were similar to that of RAC.

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Accelerated carbonation treatment of recycled concrete aggregates using flue gas: A comparative study towards performance improvement

Cited by 65 publications

References 44 publications

Sustainability assessment of recycled aggregate concrete structures: A critical view on the current state‐of‐knowledge and practice

Sustainability assessment of recycled aggregate concrete structures: A critical view on the current state‐of‐knowledge and practice

Tracking spatiotemporal evolution of cementitious carbonation via Raman imaging

Uniaxial Compressive Stress-Strain Behaviour of Recycled Aggregate Concrete Prepared With Carbonated Recycled Concrete Aggregate

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