Reactivity of aqueous carbonated cement pastes: Effect of chemical composition and carbonation conditions

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY Journal of CO2 Utilization Pub Date : 2024-11-01 DOI:10.1016/j.jcou.2024.102970
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Abstract

Aqueous carbonation of end-of-life concrete fines is a promising method to alleviate greenhouse gas emissions by CO2 sequestration from point-source emitters. This produces a valuable material that can be utilized in new cement formulations. This study investigates effects of the composition of cement pastes and of the carbonation conditions on the reactivity and phase assemblage for aqueous carbonated Portland cement pastes incorporating silica fume, fly ash, and blast furnace slag. Results from 27Al and 29Si NMR show that hydration of the carbonated pastes under reactivity test conditions lead to phase assemblages dominated by a C-(A)-S-H phase, with reduced Al/Si ratio, as well as by ettringite and hemi/monocarbonate AFm phases. The results from the reactivity tests demonstrate that the carbonated blended cement pastes exhibit superior reactivity compared to carbonated neat Portland cement paste because of their increased fraction of reactive alumina and silica species. The variations in carbonation conditions (i.e., temperature, CO2 gas concentration, and solution composition) do not alter significantly the reactivity of the carbonated pastes. These findings demonstrate the robustness of aqueous carbonation of concrete fines and support its wider application as a mean to reduce CO2 emissions and enhance circularity of cement-based materials.
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水性碳化水泥浆的反应性:化学成分和碳化条件的影响
对报废混凝土细料进行水碳化是一种很有前景的方法,可通过对点源排放者的二氧化碳进行封存来减少温室气体排放。这种方法产生的宝贵材料可用于新的水泥配方。本研究调查了水泥浆的成分和碳化条件对掺入硅灰、粉煤灰和高炉矿渣的水性碳化波特兰水泥浆的反应性和相组合的影响。27Al 和 29Si NMR 的结果表明,碳化浆料在反应性试验条件下进行水化,会产生以 C-(A)-S-H 相(铝/硅比率降低)为主的相组合,以及埃特林岩相和半碳酸盐/单碳酸盐 AFm 相。反应性测试结果表明,碳化混合水泥浆的反应性优于碳化纯波特兰水泥浆,这是因为它们的反应性氧化铝和二氧化硅种类的比例增加了。碳化条件(即温度、二氧化碳气体浓度和溶液成分)的变化不会显著改变碳化浆料的反应性。这些发现证明了混凝土细料水溶液碳化的稳健性,并支持将其作为减少二氧化碳排放和提高水泥基材料循环性的一种手段加以广泛应用。
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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
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