Carbonation potential of concrete debris fines and its valorisation through mineral carbonation

Nedunuri, Aparna Sai Surya Sree; Mohammed, Asfand yar; Muhammad, Salman

doi:10.1016/j.conbuildmat.2021.125162

Cited by 18 publications

(8 citation statements)

References 42 publications

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“…The carbonation degrees close to the full carbonation potential are reached only in a few hours at normal temperature and pressure [146,178]. However, the other studies report significantly lower carbonation degrees in the range of 40 to 50% [178,179,182,183]. The possible high reaction degree is associated with the fast dissolution rate of the cement clinker and hydrates under the action of CO 2 [54,171].…”

Section: Direct Carbonation Methods Of Recycled Concrete Pastementioning

confidence: 91%

“…In these methods, the high CO 2 pressure was used to extract calcium and accelerate the carbonation process. These pioneering works were later on followed by the carbonation experiments at normal conditions and other research groups [54,146,171,172,[178][179][180][181][182][183][184]. At ambient conditions, the carbonation reaction proceeds via a gas-liquid-solid pathway [55,185].…”

Section: Direct Carbonation Methods Of Recycled Concrete Pastementioning

confidence: 99%

“…In general, the direct aqueous carbonation of the cement paste is conducted at normal pressure and temperature. The CO 2 gas concentration used varies between 10 and 100%, while the solid-liquid ratio varies between 10 and 100 [54,146,171,[178][179][180]182,183]. Additionally, the literature reports experiments conducted at higher pressures of 10 to 20 bars [189,190].…”

Section: Direct Carbonation Methods Of Recycled Concrete Pastementioning

confidence: 99%

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CO2 Mineralization Methods in Cement and Concrete Industry

et al. 2022

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Production of Portland clinker is inherently associated with CO2 emissions originating from limestone decomposition, the irreplaceable large-scale source of calcium oxide needed. Besides carbon capture and storage, CO2 mineralization is the only lever left to reduce these process emissions. CO2 mineralization is a reversal reaction to clinker production—CO2 is bound into stable carbonates in an exothermic process. It can be applied in several environmentally and economically favorable ways at different stages of clinker, cement and concrete life cycle. These possibilities are assessed and discussed in this contribution. The results demonstrate that when combined with concrete recycling, the complete circularity of all its constituents, including the process CO2 emissions from the clinker, can be achieved and the overall related CO2 intensity significantly reduced.

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Section: Direct Carbonation Methods Of Recycled Concrete Pastementioning

confidence: 91%

Section: Direct Carbonation Methods Of Recycled Concrete Pastementioning

confidence: 99%

Section: Direct Carbonation Methods Of Recycled Concrete Pastementioning

confidence: 99%

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CO2 Mineralization Methods in Cement and Concrete Industry

et al. 2022

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“…In general, the carbonation of concrete is limited to a relatively thin layer near the exposed surface due to the fact that the carbonated layer reduces CO 2 diffusion. Therefore, CO 2 uptake of concrete during service life calculations, previously mentioned, indicate that it still presents high carbonation potential when it is demolished [36,[68][69][70]. The crushed CDW presents a large source of non-carbonated old concrete, which contributes to the increase in carbonate minerals.…”

Section: Carbonation Of Recycled Aggregatesmentioning

confidence: 97%

Carbonation Potential of Cementitious Structures in Service and Post-Demolition: A Review

Pederneiras¹,

Farinha²,

Veiga

2022

CivilEng

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The construction sector is responsible for a great environmental impact. The cement industry, which is included in this sector, emits about 650 to 800 kg of CO2 per each tonne of cement produced, being one of the most polluting industries in terms of greenhouse gas emissions. The cement manufacturing process releases about 7% of the total worldwide CO2 emissions. However, concrete and cement-based materials present CO2 uptake potential during their service life and post-demolition through carbonation processes. The carbonation reactions rate depends on several factors, namely type and content of cement, porosity of concrete, temperature, relative humidity and exposure conditions area. Therefore, to estimate the CO2 capture of concrete during its life cycle is not a straightforward calculation. Some studies have been developed using different methodologies in order to evaluate the CO2 potential of cementitious elements in service and post-demolition. This paper reviews the documented approaches that quantify the CO2 uptake of concrete over time, summarizing the assumptions adopted for each previous work. Overall, it was concluded that part of the CO2 emissions released during cement production are reabsorbed by concrete products during their life cycle, which partially offsets the environmental impact and reduces the CO2 footprint of the cement industry.

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“…However, the natural CO 2 absorption of concrete structures is still inadequate, and the associated reaction occurs at a slow rate over geological timescales; hence, accelerated carbonation methods have been used to assess carbonation under natural conditions (Auroy et al 2018). One such method is the novel CO 2 sequestration process accomplished by extracting minerals from concrete waste through wet carbonation (Nedunuri et al 2021). Recent studies have indicated that the wet carbonation process can aid in the fast carbonation of concrete fines (Iizuka et al 2004;Skocek et al 2020;Zajac et al 2021c), and it has several advantages such as lower costs and lower chemical consumption rates compared to indirect carbonation (Fernández Bertos et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Wet-carbonation-based Mineral Extraction and CO<sub>2</sub> Sequestration Using Concrete Waste Fines at a Low Temperature

Bui

Kurihara

Wang

et al. 2023

ACT

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This study investigates the wet carbonation of concrete fines with CO 2 and natural air gas bubbling in a carbonation system at low temperatures. After the air-and CO 2 -wet carbonations, the properties of a solution and hydrated cement paste powder are determined. In the air and CO 2 -wet carbonations, more Ca is extracted into the solution at a low temperature of 5°C. This high Ca concentration in the solution through air-wet carbonation primarily originates from the portlandite and unhydrated phases of the cement paste. Even in solutions with high pH values, the rehydration process and C-S-H decomposition occur simultaneously in air-wet carbonation. Moreover, CO 2 -wet carbonation indicates that the decalcification of C-S-H occurs rapidly, even in the presence of portlandite. Air-wet carbonation presents a potential method for the direct air capture of CO 2 using concrete waste fines in a short period.

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Carbonation potential of concrete debris fines and its valorisation through mineral carbonation

Cited by 18 publications

References 42 publications

CO2 Mineralization Methods in Cement and Concrete Industry

CO2 Mineralization Methods in Cement and Concrete Industry

Carbonation Potential of Cementitious Structures in Service and Post-Demolition: A Review

Wet-carbonation-based Mineral Extraction and CO<sub>2</sub> Sequestration Using Concrete Waste Fines at a Low Temperature

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