Carbonation-induced properties of alkali-activated cement exposed to saturated and supercritical CO2

Samarakoon, M.H.; Ranjith, P.G.; Xiao, Fei; Isaka, B.L. Avanthi; Gajanayake, Shashika

doi:10.1016/j.ijggc.2021.103429

Cited by 17 publications

(8 citation statements)

References 57 publications

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“…As shown in Figure , the SCSE values of CSAC at 0.3 and 0.1 MPa CO 2 pressure are 2.75 and 2.74 MPa –1 h –1 , respectively, indicating that 2.75 and 2.74% CO 2 are absorbed for each unit strength gain and CO 2 curing duration, about an order of magnitude higher when compared with other reported results. ,,, …”

Section: Resultsmentioning

confidence: 59%

“…As shown in Figure 16, the SCSE values of CSAC at 0.3 and 0.1 MPa CO 2 pressure are 2.75 and 2.74 MPa −1 h −1 , respectively, indicating that 2.75 and 2.74% CO 2 are absorbed for each unit strength gain and CO 2 curing duration, about an order of magnitude higher when compared with other reported results. 15,25,48,49 The ecological advantages associated with the utilization of CSAC is assessed by the LCA methodology based on the International Organization for Standards (ISO) 14040 50 using the commercially available LCA software SimaPro 8.5. 51 The evaluation methods of various environmental impact indicators are shown in Table 3.…”

Section: Methodsmentioning

confidence: 99%

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Development of a Sustainable CO₂ Solidified Aerated Concrete

Lei

Deng

Liu

et al. 2022

ACS Sustainable Chem. Eng.

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This study reports a CO 2 solidified aerated concrete (CSAC) with γ-C 2 S as the primary carbonatable binder. Several experiments were performed to test CSAC for its physical and mechanical properties. With the coupling positive effects of high carbonation reactivity of γ-C 2 S and the addition of cellulous fibers, CSAC is characterized with high compressive strength, high and uniform carbonation degree, prominent strength-based CO 2 absorption efficiency, and low energy consumption with a short CO 2 curing duration. The uniquely wrinkled texture of cellulous fibers facilitates the inward diffusion of CO 2 which explains the high degree of reaction and CO 2 absorption. The results show that CSAC has a compressive strength of 4.5 MPa and a carbonation degree of 65.8% when the carbonation duration is only 2 h at 60% CO 2 concentration, and the amount of solidified CO 2 normalized with respect to the compressive strength and curing time of a mix (CO 2 solidification efficiency) can reach 2.74 MPa −1 h −1 . The research provides a promising method for preparing aerated concrete with large-scale CO 2 utilization to induce a sustainable stance for the concrete industry as it fulfills mandates for a lower carbon footprint.

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Section: Resultsmentioning

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Development of a Sustainable CO₂ Solidified Aerated Concrete

Lei

Deng

Liu

et al. 2022

ACS Sustainable Chem. Eng.

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“…While there are many research reports on concrete carbonation using supercritical CO 2 , most studies focused on the changes in the mechanical properties and microstructure attributed to the supercritical CO 2 carbonation of concrete [ 32 , 33 , 34 ]. Conversely, this study investigated a method for reducing industrial CO 2 emissions and realizing net-zero emissions by developing a carbon utilization and sequestration technology that utilizes the CSW generated during concrete production as a new CO 2 sink using the supercritical CO 2 reaction.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Concrete Slurry Waste Ratio on Supercritical CO2 Sequestration

Sim

Ryu

2023

Materials

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To prevent drastic climate changes due to global warming, it is necessary to transition to a carbon-neutral society by reducing greenhouse gas emissions in all industrial sectors. This study aimed to develop carbon utilization sequestration technology that uses the concrete slurry water generated during the production of concrete as a new CO2 sink to reduce CO2 emissions from the cement industry. This was achieved by performing supercritical CO2 carbonation by varying the concrete slurry waste (CSW) ratio. The study’s results confirmed that, according to the CSW ratio (5 to 25%), complete carbonation occurred within only 10 min of the reaction at 40 °C and 100 bar.

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“…Due to its high silica content and amorphous nature, waste glass, especially when supplemented with alumina-rich materials such as fly ash, metakaolin, and calcium aluminate cement, can be used as a precursor for GP production. While some studies suggest that glass-based GPs could even be composed without additional alumina, improved durability and higher compressive strengths reported for GPs synthesized from a combination of glass and alumina-rich materials do highlight the vital role of alumina content in GP strength development and durability. − Noteworthy is that recent studies exhibited that waste glasses, especially when treated with solutions of NaOH/Na 2 CO 3 , can act as proper alkaline activators which can induce the same impacts as silicon in water glasses. − …”

Section: Gp Systemsmentioning

confidence: 99%

“…However, instead of being purely a deleterious effect, the carbonation of GPs could also lead to improvement of GP properties in certain applications. The solid carbonates precipitated during the carbonation process can act as pore filling materials that improve the compactness of the matrix and reduce the permeability (and thus the diffusion depth of CO 2 ), strengthening the binder against further CO 2 ingress . Pouhet and Cyr observed a rapid increase in compressive strength of metakaolin-based GPs experiencing accelerated degrees of carbonation, which was accompanied by a sharp decrease in pH values.…”

Section: Factors Affecting the Properties Of Gpsmentioning

confidence: 99%

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives

et al. 2023

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Wellbores used in underground production and storage activities, including carbon capture and storage (CCS), are typically sealed using sealants based on Ordinary Portland Cement (OPC). However, leakage along these seals or through them during CCS operations can pose a significant threat to long-term storage integrity. In this review paper, we explore the potential of geopolymer (GP) systems as alternative sealants in wells exposed to CO 2 during CCS. First, we discuss how key parameters control the mechanical properties, permeability, and chemical durability of GPs based on different starting materials as well as their optimum values. These parameters include the chemical and mineralogical composition, particle size, and particle shape of the precursor materials; the composition of the hardener; the chemistry of the full system (particularly the Si/Al, Si/(Na+K), Si/Ca, Si/Mg, and Si/Fe ratios); the water content of the mix; and the conditions under which curing occurs. Next, we review existing knowledge on the use of GPs as wellbore sealants to identify key knowledge gaps and challenges and the research needed to address these challenges. Our review shows the great potential of GPs as alternative wellbore sealant materials in CCS (as well as other applications) due to their high corrosion durability, low matrix permeability, and good mechanical properties. However, important challenges are identified that require further research, such as mix optimization, taking into account curing and exposure conditions and available starting materials; the development of optimalization workflows, along with building larger data sets on how the identified parameters affect GP properties, can streamline this optimization for future applications.

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Carbonation-induced properties of alkali-activated cement exposed to saturated and supercritical CO2

Cited by 17 publications

References 57 publications

Development of a Sustainable CO₂ Solidified Aerated Concrete

Development of a Sustainable CO₂ Solidified Aerated Concrete

Effect of the Concrete Slurry Waste Ratio on Supercritical CO2 Sequestration

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives

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Carbonation-induced properties of alkali-activated cement exposed to saturated and supercritical CO2

Cited by 17 publications

References 57 publications

Development of a Sustainable CO2 Solidified Aerated Concrete

Development of a Sustainable CO2 Solidified Aerated Concrete

Effect of the Concrete Slurry Waste Ratio on Supercritical CO2 Sequestration

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO2 Exposure and Perspectives

Contact Info

Product

Resources

About

Development of a Sustainable CO₂ Solidified Aerated Concrete

Development of a Sustainable CO₂ Solidified Aerated Concrete

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives