Time-resolved direct carbonation of fresh concrete slurry waste for carbon capture and storage based on hydrochemical parameters, mineralogy, and micromorphology
水和パラメータ、鉱物学、微形態に基づくフレッシュコンクリートスラリー廃棄物の時間分解直接炭酸塩化による二酸化炭素回収・貯留 (AI 翻訳)
Svenja Vogt, Felix Brück, Harald Weigand
🤖 gxceed AI 要約
日本語
コンクリートスラリー廃棄物（CSW）をCO2貯留源として活用する炭酸塩化プロセスを研究。電気伝導度の極小値（ECmin）以降も炭酸カルシウム沈殿が継続し、CO2吸収はpH10以下でセメント水和物の炭酸塩化により制御されることを発見。pHとECのオンラインモニタリングが炭酸塩化進行の指標として有効であることを示した。
English
This study investigates carbonation of concrete slurry waste (CSW) as a CO2 sink. Contrary to initial hypothesis, CaCO3 precipitation continues beyond the electrical conductivity minimum (ECmin), with CO2 uptake below pH 10 controlled by carbonation of cement hydration products. Online monitoring of pH and EC provides valuable process indicators for optimizing carbonation.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本ではCCUSがGXの重要施策であり、建設廃棄物の有効活用はカーボンニュートラルに貢献する。本研究成果は廃コンクリートスラリーの炭酸塩化プロセス最適化に寄与するが、日本の実廃棄物での検証が望まれる。
In the global GX context
This paper contributes to global CCUS literature by demonstrating the potential of concrete slurry waste as a CO2 sink. The use of real-time pH and conductivity monitoring offers a simple yet effective method for optimizing carbonation processes, relevant for industrial-scale CCUS applications.
👥 読者別の含意
🔬研究者:Provides mechanistic insights into carbonation of cementitious materials, particularly the role of C-S-H carbonation at low pH.
🏢実務担当者:Offers a practical monitoring approach (pH, EC) to control carbonation of concrete waste, useful for developing CCUS processes in construction.
📄 Abstract（原文）
Concrete slurry waste (CSW), a by-product of concrete processing, is a substantial yet underexploited CO 2 sink. During accelerated carbonation of a model CSW we previously observed a pronounced and reproducible minimum in the electric conductivity (EC min ) shortly after initiating carbonation. With sustained supply of CO 2 and while the pH fell below 10, the EC rebounded. Here, we investigated if this was caused by redissolution of CaCO 3 which would limit the carbonation efficiency. To test this, slurry carbonation experiments were conducted with model slurry and real CSW in a stirred tank carbonation reactor with gas recirculation. Online monitoring of pH, EC, and reactor pressure was complemented by stage-resolved sampling, including the EC min , for analysis of the solid and aqueous phases along the treatment. Other than hypothesized, in both materials CaCO 3 precipitation continued beyond EC min , yet at a lower rate as confirmed by the time-course of reactor pressure and thermogravimetric analysis. The rebounding EC beyond EC min was largely driven by increasing sulfate concentrations. These may date back to interlayer sulfate released upon carbonation of C–S–H and/or to dissolution of ettringite-borne gypsum. Thus, carbonation of cement hydration products likely controlled the CO 2 uptake below pH 10. Our results indicate that online monitoring of the robust process indicators pH and EC provides valuable insight into the carbonation progress and may serve to delineate the appropriate termination point according to specific treatment objectives.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.jcou.2026.103477first seen 2026-06-06 05:01:07
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