Carbonated Concrete Slurry Waste as Supplementary Cementitious Material

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-08-23 DOI:10.3151/jact.22.485
Frank Winnefeld, Johannes Tiefenthaler, Andreas Leemann
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Abstract

Concrete slurry waste is generated at concrete plants and generally re-used in new batches of concretes. Due to the presence of hydrated cement paste it has the potential to be carbonated prior to re-use in order not only to store CO2, but also to enhance its reactivity in blends with cement. In this study, a concrete slurry waste obtained at a ready-mix concrete plant was investigated. For accelerated carbonation, a wet process was used at laboratory scale. The carbonated product was dried afterwards, characterized and used as supplementary cementitious material. When carbonated, the hydrate phases of the concrete slurry waste decomposed to calcite, gypsum and a silica-alumina gel. When blended with Portland cement (30% replacement by mass) early hydration kinetics was accelerated by the carbonated concrete slurry waste. The pozzolanic reaction of the silica-alumina gel consumed a significant part of the portlandite and showed a slightly positive contribution to compressive strength compared to inert quartz powder and to the uncarbonated concrete slurry. This offers the use of carbonated concrete slurry waste to store CO2 in concrete with the additional benefit of reducing the cement content.

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作为补充胶凝材料的碳化混凝土浆废料
混凝土工厂会产生混凝土浆废料,通常会在新批次的混凝土中重复使用。由于水化水泥浆的存在,它有可能在重新使用前被碳化,这样不仅可以储存二氧化碳,还可以提高其与水泥混合的反应能力。本研究对一家预拌混凝土厂产生的混凝土浆废料进行了调查。为了加速碳化,我们在实验室采用了湿法工艺。碳化后的产品经过干燥、表征并用作胶凝补充材料。碳化后,混凝土浆料废料中的水合物相分解为方解石、石膏和硅铝凝胶。当与波特兰水泥(30% 替代质量)混合时,碳化混凝土浆废料加速了早期水化动力学。二氧化硅-氧化铝凝胶的水胶化反应消耗了大量的波特兰石,与惰性石英粉和未碳化的混凝土浆相比,对抗压强度的贡献略微增加。这为利用碳化混凝土浆废料在混凝土中储存二氧化碳提供了可能,同时还能降低水泥含量。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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