Journal of CO2 Utilization最新文献

{"title":"Simultaneously comparing various CO2-mineralized steelmaking slags as supplementary cementitious materials via high gravity carbonation","authors":"Tse-Lun Chen ,&nbsp;Bo-Kai Shu ,&nbsp;Yi-Hung Chen ,&nbsp;Pen-Chi Chiang","doi":"10.1016/j.jcou.2024.102985","DOIUrl":"10.1016/j.jcou.2024.102985","url":null,"abstract":"<div><div>The integration of accelerated carbonation with the utilization of steelmaking slags presents a vital strategy for CO₂ mineralization towards net-zero scheme. This study simultaneously evaluates basic oxygen furnace slag (BOFS), refining slag (RFS), and electric arc furnace reducing (EAFRS) and oxidizing slags (EAFOS) as potential partial replacements for ordinary Portland cement, at substitution levels ranging from 5 % to 15 % as supplementary cementitious materials (SCMs). These slags were pretreated through aqueous accelerated carbonation in a high-gravity rotating packed bed. We assessed several parameters, including carbonation conversion, CO₂ capture capacity, workability, strength, and durability. The results demonstrated that EAFRS achieved the highest CO₂ capture capacity, reaching 0.193 kg-CO₂/kg-slag with a maximum carbonation conversion of 46 % under 197 times high-gravity conditions and a liquid-to-solid ratio of 20. While the incorporation of carbonated slags had minimal impact on the setting properties of cement pastes, higher substitution ratios necessitated increased water demand. The strength of blended cement containing 5 %, 10 %, and 15 % of carbonated BOFS, RFS, and EAFRS met standard requirements at 28th day. Additionally, a mathematical model was developed to predict the mechanical strength of cement mortars. The introduction of carbonated BOFS, RFS, and EAFRS facilitated hydration due to the formation of calcium carbonates, although it resulted in slower strength development kinetics. Notably, the replacement of cement with carbonated EAFOS exhibited a higher expansion rate, likely due to its elevated silicon dioxide and alkaline species content, which may lead to alkali-aggregate reactions, resulting in expansion and cracking.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102985"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effects of curing conditions on the performance and carbon dioxide emissions of fly ash-magnesium phosphate cement repair materials for pavement maintenance","authors":"Ying Su ,&nbsp;Yelin Qian ,&nbsp;Ming Sun ,&nbsp;Changchun Li ,&nbsp;Chunmei Liu ,&nbsp;Dan Zhang ,&nbsp;Xiaodong Zhang ,&nbsp;Jun Yang ,&nbsp;Yan Zhao ,&nbsp;Rui Tao ,&nbsp;Fengxia Xu","doi":"10.1016/j.jcou.2024.102998","DOIUrl":"10.1016/j.jcou.2024.102998","url":null,"abstract":"<div><div>Magnesium phosphate cement (MPC) is a new type of repair material that is fast-setting, resistant to acids and alkalis, and environmentally friendly. Compared to commonly used repair materials and protective coatings, such as sulphoaluminate cement, epoxy resin, and zinc phosphate, MPC significantly reduces carbon dioxide emissions throughout its entire lifecycle (from raw material extraction to application, service, and waste disposal). Additionally, its advantages of fast curing, early strength, and excellent adhesion make it suitable for rapid repair of damaged roads and bridges. Furthermore, incorporating industrial by-products such as fly ash (FA) into MPC results in a cement that combines the advantageous properties of FA, offering excellent workability and durability. The substitution of FA for raw materials in MPC reduces the reliance on dead-burned MgO, contributing to a further reduction in CO₂ emissions and lessening the impact on the natural environment. Studies have shown that MPC exhibits a decrease in strength under high humidity and water-curing conditions, and the addition of FA can help improve this phenomenon. However, the research lacks investigations on the effect of FA on the performance of MPC under different curing methods, with the same mix ratios and experimental conditions. This paper investigates the effects of FA content on MPC under standard curing conditions by measuring setting time, fluidity, and mechanical properties, as well as conducting microstructural characterization using XRD, FT-IR, and SEM. The results indicate that the addition of FA prolongs the setting time and decreases fluidity. Under standard curing conditions, the flexural strength after curing is higher than that under air curing, due to the formation of more gel-like products, which contribute to a denser microstructure favorable for the development of flexural strength. Moreover, standard curing conditions also promote the improvement of bonding strength. The bonding strength with the old substrate is higher than the flexural strength of FA-MPC itself, indicating that this material meets the requirements for the repair of highways and bridges. However, SEM analysis reveals that the moisture-rich curing environment may lead to cracking and damage in the hydration products of MPC, resulting in a reduction in compressive strength. The incorporation of FA enhances the mechanical properties of MPC through both the filling effect and pozzolanic activity, partially replacing MgO. Moreover, the addition of FA lowers the global warming potential (GWP) of MPC, reduces carbon emissions, and promotes more sustainable development.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102998"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Imidazolium bromide substituted magnesium phthalocyanine polymers: New promising materials for CO2 conversion” [J. CO2 Util. 85 (2024) 102875–102886]","authors":"Benedetto Taormina ,&nbsp;Rémy Jouclas ,&nbsp;Vittorio Marsala ,&nbsp;Michelangelo Gruttadauria ,&nbsp;Francesco Giacalone ,&nbsp;Carmela Aprile","doi":"10.1016/j.jcou.2024.102982","DOIUrl":"10.1016/j.jcou.2024.102982","url":null,"abstract":"","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102982"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanistic investigation of CO2 hydrogenation to methanol on W-doped Cu surfaces","authors":"Hamideh Khodabandeh,&nbsp;Ali Nakhaei Pour ,&nbsp;Ali Mohammadi","doi":"10.1016/j.jcou.2024.102997","DOIUrl":"10.1016/j.jcou.2024.102997","url":null,"abstract":"<div><div>Density functional theory (DFT) computations were applied to study the adsorption of intermediates, the thermodynamic and kinetic mechanism of the conversion of CO₂ to methanol upon the W-doped Cu surface, and the effect of W-doping on the decomposition and selectivity of methanol. For this reason, the adsorption structures and energies for the most stable structures were calculated. The outcomes displayed that the adsorption of intermediates over the surface of Cu-W is more powerful than the surface of Cu due to strain and ligand effect. Two reaction pathways of methanol synthesis (formate and carboxyl routs) were studied. The transition situation configurations and the potential energy profiles associated with each primary stage upon the surfaces of Cu (111) and Cu-W (111) were explored. The relevant activation barrier, rate constant, reaction energy, and Gibbs free energy for each primary stage were computed and the rate-limiting stages were determined. The Brønsted-Evans-Polanyi (BEP) relationships were used to study which pathway of conversion of CO₂ to methanol is better. The outcomes indicated that W weakens the performance of the catalyst and the carboxyl route is more suitable than the formate route due to the low activation barrier for most of its primary stages. Also, the outcomes indicated that W-doping increased the methanol decomposition and reduced the selectivity of methanol.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102997"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-modal imaging of the cementitious carbonation front: Evidence for pore refinement","authors":"Sudharsan Rathnakumar,&nbsp;Nishant Garg","doi":"10.1016/j.jcou.2024.102993","DOIUrl":"10.1016/j.jcou.2024.102993","url":null,"abstract":"<div><div>Cementitious carbonation is an important phenomenon considering its dual implications on durability (carbonation-induced steel corrosion) and sustainability (CO₂ mineralization in carbonatable binders). Currently, there is strong interest in understanding the nature of the carbonation front and resolving microstructural changes that happen upon carbonation. In this study, we shed light on these issues by adopting a multi-modal imaging approach wherein we deploy three complementary methods on the same specimen that has undergone carbonation: laser profilometry, contact angle goniometry, and Raman imaging. Firstly, we find that irrespective of the technique deployed, the carbonation front is non-planar, and its width can be on the order of a few millimeters. Secondly, the intersection region of calcite and portlandite mineral maps roughly correlates with the front as mapped from imaging methods. Thirdly, and finally, the carbonated region of hydrated cement samples seems to have undergone measurable pore refinement. Thus, we demonstrate the efficacy of multi-modal imaging in improving our understanding of cementitious carbonation front.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102993"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Techno-economic and life cycle environmental assessments of CO2 utilization for value-added precipitated calcium carbonate and ammonium sulfate fertilizer co-production","authors":"Feyza Kazanç,&nbsp;Peng Zhang,&nbsp;Partha Saha,&nbsp;Yongqi Lu","doi":"10.1016/j.jcou.2024.102992","DOIUrl":"10.1016/j.jcou.2024.102992","url":null,"abstract":"<div><div>An advanced CO₂ mineralization technology using Flue Gas Desulfurization (FGD) byproduct gypsum, which coproduces value-added precipitated calcium carbonate (precipitated CaCO₃, PCC) and ammonium sulfate [(NH₄)₂SO₄, AS] fertilizer, is being developed to address the technical challenges of achieving simultaneous CO₂ capture and utilization, high CO₂ and calcium conversion, and enhanced energy efficiency. This study aimed to conduct a techno-economic analysis (TEA) and a life cycle assessment (LCA) for this technology. In the TEA, mass and energy balances for CO₂ mineralization integrated with a power plant to utilize all FGD gypsum and approximately 51,000 tonne/year of CO₂ in flue gas were developed through modeling. Major equipment was selected and sized, followed by capital and operating cost analyses. Energy efficiency was improved through the integrated use of both low-grade steam and vacuum from the power plant steam cycle. TEA results revealed that this process was profitable, with a levelized net profit of $328.4 per tonne of CO₂ utilized. The LCA was performed as a cradle-to-gate study for comparative assessments of global warming potential (GWP) and other environmental impacts between the CO₂ mineralization system (i.e., Proposed Production System or PPS) and the conventional processes (i.e., Comparison Production System or CPS). The PPS resulted in a GWP impact of 0.85 kg CO₂-Eq per 1 kg of primary PCC production and 1.32 kg of byproduct AS production, approximately 64 % lower than that of the CPS. The LCA results for other environmental impacts also consistently showed impacts 35–88 % lower for the PPS compared to the CPS.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102992"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A sintered Ni-YSZ catalytic reactor for highly efficient synthesis of green CH4","authors":"Zheng Zhang ,&nbsp;Junkang Sang ,&nbsp;Mingzhong Shen ,&nbsp;Anqi Wu ,&nbsp;Kailiang Wang ,&nbsp;Junhua Su ,&nbsp;Fei Wang ,&nbsp;Yingying Han ,&nbsp;Wanbing Guan","doi":"10.1016/j.jcou.2024.102991","DOIUrl":"10.1016/j.jcou.2024.102991","url":null,"abstract":"<div><div>Methane synthesis from CO₂ is an important process for transforming and storing renewable electrical energy, and one of the main issues facing methanation catalysts is stability. Herein, a plate-and-tube structured porous metal-ceramic Ni-YSZ reactor with high-temperature sintering was designed to produce CH₄ from CO₂ at atmospheric pressure and 325°C. The reactor was steadily operated for 1000 hours. The results showed that both the CO₂ conversion and the CH₄ selectivity continuously stayed over 90 % and 99.9 %, respectively. The results of <em>in situ</em> infrared and <em>in situ</em> programmed warming characterizations demonstrated that the hydrogenation of oxygen vacancies on the surface of Ni-O-Zr was the main pathway by which CO₂ was converted to CH₄ in this reactor. Moreover, the strongly basic adsorbed HCOO* and CO* intermediates facilitated further hydrogenation. This reactor structure decreases the reduction in reaction activity associated with catalyst sintering, coalescence, and carbon accumulation. Moreover, it provides a novel approach to reactor design for the stable operation of CO₂-derived methane at high temperatures.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102991"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mitigation of coal spontaneous combustion and enhanced coalbed methane recovery using liquid CO₂: Mechanisms, field applications, and implications for mines","authors":"Xiaojiao Cheng ,&nbsp;Jinsuo Song ,&nbsp;Hu Wen ,&nbsp;Shixing Fan ,&nbsp;Mingyang Liu ,&nbsp;Wansheng Mi ,&nbsp;Zhijin Yu ,&nbsp;Yin Liu ,&nbsp;Rijun Li","doi":"10.1016/j.jcou.2024.102987","DOIUrl":"10.1016/j.jcou.2024.102987","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Spontaneous gas and coal combustion represent primary disasters threatening the safety of underground coal mines. Achieving the collaborative governance of the two disasters and enhancing the ability to prevent and mitigate mine disasters are technical challenges faced by high-gas/outburst mines. CO&lt;sub&gt;2&lt;/sub&gt; has become the primary choice for collaborative disaster governance because of its efficient control of the oxidation process of residual coal in goaf, enhanced coalbed methane (ECBM) recovery, and the goal of “2030 carbon peak and 2060 carbon neutralisation”. Therefore, this study adopted summary and engineering verification methods. Firstly, the basic physical and chemical properties of CO&lt;sub&gt;2&lt;/sub&gt; were analysed, and the three mechanisms of action of liquid CO&lt;sub&gt;2&lt;/sub&gt; for preventing coal spontaneous combustion (CSC), namely, “CO&lt;sub&gt;2&lt;/sub&gt; adsorbed and hindered oxidation reactions, absorbs ambient heat and reduces ambient temperature, and reduce the oxygen concentration in the goaf and inhibiting gas explosion”, and the six mechanisms of action of liquid CO&lt;sub&gt;2&lt;/sub&gt; ECBM recovery, namely, “pressure fracturing, low-temperature frostbite, physical extraction and chemical corrosion, low-viscosity permeability, phase change pressurisation, and competitive adsorption”, were summarised. Second, the effect was verified by the field application of liquid CO&lt;sub&gt;2&lt;/sub&gt; CSC emergency prevention and control at the Qinggangping Coal Mine and the engineering test of liquid CO&lt;sub&gt;2&lt;/sub&gt; ECBM recovery in the Shuanglong Coal Mine. Finally, based on the application status of liquid CO&lt;sub&gt;2&lt;/sub&gt; in coal mines, a new model of “liquid CO&lt;sub&gt;2&lt;/sub&gt; prevention and control of CSC and enhancing coalbed methane recovery comprehensive disaster reduction technology” is proposed. The results of the emergency prevention and control of liquid CO&lt;sub&gt;2&lt;/sub&gt; CSC show that CO&lt;sub&gt;2&lt;/sub&gt; sinking drives CH&lt;sub&gt;4&lt;/sub&gt; out of the roadway, avoids the accumulation of CH&lt;sub&gt;4&lt;/sub&gt; near the fire area, and achieves explosion suppression. The concentrations of C&lt;sub&gt;2&lt;/sub&gt;H&lt;sub&gt;2&lt;/sub&gt; and C&lt;sub&gt;2&lt;/sub&gt;H&lt;sub&gt;4&lt;/sub&gt; in the mine decreased rapidly to 0. No open fire or severe combustion occurred in the mine, and the fire area was effectively controlled. After the ventilation of the mine was restored, the isolated and closed 42108 working face was injected with liquid CO&lt;sub&gt;2&lt;/sub&gt; again. The CO concentration of the inlet and return air along the channel gradually decreased to zero, and the fire area of the working face was further controlled. The engineering test of liquid CO&lt;sub&gt;2&lt;/sub&gt;-ECBM recovery showed that the dominant seepage range was 12&lt;img&gt;15 m from the injection hole, and the dominant diffusion range was 25&lt;img&gt;30 m from the injection hole. The average CH&lt;sub&gt;4&lt;/sub&gt; flow rate in the field extraction test was more than three times that of the original area. Through two field cases, long-distance liquid CO&lt;sub&gt;2&lt;/sub&gt; prevention and con","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102987"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ionic quaternary ammonium-triazole polymers as efficient single-component catalysts for CO2 conversion","authors":"Pobporn Promchan ,&nbsp;Atthapon Srifa ,&nbsp;Bunyarat Rungtaweevoranit ,&nbsp;Puttipong Pananusorn ,&nbsp;Khamphee Phomphrai ,&nbsp;Preeyanuch Sangtrirutnugul","doi":"10.1016/j.jcou.2024.102989","DOIUrl":"10.1016/j.jcou.2024.102989","url":null,"abstract":"<div><div>Ionic organic polymers with halide counterions have been investigated as effective and reusable single-component, heterogeneous catalysts for the cycloaddition of CO₂ and epoxides to form cyclic carbonates. In this study, we synthesized three new ionic polymers featuring quaternary ammonium-triazole functional groups with iodide counterions. Copper-catalyzed azide-alkyne cycloaddition (CuAAC) between tetrapropargylammonium bromide and various diazide compounds (N₃–Ar–N₃), where Ar represents 1,4-xylene, 1,5-naphthalene, and 4,4′-phenylbenzamide followed by halide exchange, afforded the organic polymers <strong>QAP1</strong>–<strong>3</strong>, respectively. The formation of triazole moieties and the disappearance of azide functional groups were confirmed by ¹³C CP/MAS NMR and FT-IR spectroscopy, respectively. CO₂ sorption studies showed reduced adsorption capacities compared to neutral amine analogs. The xylene-linked polymer (<strong>QAP1</strong>) exhibited the highest catalytic efficiency for CO₂/epoxide cycloaddition, achieving high conversion and selectivity under 10 atm CO₂ at 120 °C. Reusability study showed that <strong>QAP1</strong> could be reused for four cycles with minimal loss in activity, though some thermal decomposition of quaternary ammonium groups was observed in solution.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102989"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Natural fibre-enhanced CO2 transport and uptake in cement pastes subjected to enforced carbonation","authors":"Yixiu Zhuge,&nbsp;Pei B. Ong,&nbsp;Hong S. Wong,&nbsp;Rupert J. Myers","doi":"10.1016/j.jcou.2024.102983","DOIUrl":"10.1016/j.jcou.2024.102983","url":null,"abstract":"<div><div>Mineral carbonation is an effective CO₂ sequestration approach and can be applied to cement-based materials through enforced carbonation curing. To accelerate this process, this study investigated the use of natural fibres (hemp, jute, cotton, and wool) to enhance CO₂ transport in cement composites. Spun fibre yarns were added to cement pastes and subjected to enforced carbonation (20 vol% CO₂) at 25 °C and 1 atm for 24–168 hours. Carbonation profiles were evaluated using two methods: phenolphthalein indicator coupled with image analysis, and thermogravimetric analysis (TGA). A novel image analysis method, based on colour deconvolution of phenolphthalein-stained images, was developed. Results from this method were consistent with those from TGA, offering a reliable and rapid technique for quantitatively assessing carbonation profiles of cement-based materials. The results confirmed that the natural fibre yarns created preferential CO₂ transport pathways to facilitate CO₂ uptake. Hemp yarns led to the most significant acceleration of CO₂ transport, with carbonation fronts reaching 50 mm depths within 24 hours. Samples without fibres only showed superficial carbonation at the exposure surface. The findings of this study indicate the feasibility of using natural fibres to improve CO₂ sequestration in cement-based materials.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"90 ","pages":"Article 102983"},"PeriodicalIF":7.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}