Quantitative influence of conditions on CO2-activation quality in recycled cement paste powder: content, morphology and chemical reactivity of target product and CO2 sequestration capacity

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-05-12 DOI:10.1016/j.cemconcomp.2025.106120

Yaogang Tian, Jing Jiang, Kuo Ji, Jin Tian, Junpeng Yang, Kan Jia, Xin Lu

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引用次数: 0

Abstract

Cement clinker production is a major contributor to CO₂-intensive emissions and high energy consumption in the cement industry, necessitating urgent development of sustainable alternatives. In this study, thus, a CO₂-activation recycled cement paste powder (ca-RCPP) with pozzolanic activity and aragonite whisker was synthesized by enhancing recycled cement paste powder (RCPP) through CO₂. Meantime, the change rule of CO₂-activation quality of ca-RCPP was quantitatively investigated and the related effect mechanism was elucidated under different CO₂-activation conditions. The results showed that ca-RCPP was dominated by calcite under high CO₂ dissolution conditions. Increasing the concentration of crystal modifier (MgCl₂·6H₂O), CO₂-activation temperature and rotation speed promoted a moderate reduction in CO₃²⁻ saturation, which enhanced both the content and length-diameter ratio (L/D) of aragonite, thereby improving the chemical reactivity of ca-RCPP with 3CaO·Al₂O₃. However, excessively low CO₃²⁻ saturation levels were proved counterproductive. Concurrently, silica gel content and CO₂ sequestration efficiency (β) always decreased under these conditions. Prolonged CO₂-activation time increased aragonite content, β, silica gel content and pozzolanic activity of ca-RCPP, but shortened the L/D of aragonite. Elevated gas flux of CO₂ similarly enhanced β and silica gel content, but diminished both the content and L/D of aragonite. Correlation analysis demonstrated an overall synergistic relationship between these evaluation indexes of CO₂-activation quality under the influence of most CO₂-activation conditions. Additionally, the concentration of crystal modifier, CO₂-activation time and CO₂-activation temperature exerted greater influence on the CO₂-activation quality of ca-RCPP than gas flux of CO₂ or rotation speed.

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条件对再生水泥浆粉中CO2活化质量的定量影响：目标产物的含量、形态和化学反应性以及CO2固存能力

水泥熟料生产是水泥行业二氧化碳密集型排放和高能耗的主要来源，迫切需要开发可持续的替代品。因此，本研究通过对再生水泥浆粉（RCPP）进行CO2强化，合成了具有火山灰活性和文石晶须的CO2活化再生水泥浆粉（ca-RCPP）。同时，定量研究了ca-RCPP在不同co2活化条件下co2活化质量的变化规律，并阐明了其作用机理。结果表明：在高CO2溶解条件下，ca-RCPP以方解石为主；提高晶体改性剂MgCl2·6H2O的浓度、co2活化温度和转速，可使CO32-饱和度适度降低，从而提高文石的含量和长径比（L/D），从而提高ca-RCPP与3CaO·Al2O3的化学反应活性。然而，过低的CO32饱和水平被证明是适得其反的。同时，在此条件下，硅胶含量和CO2固存效率（β）不断降低。延长co2活化时间可提高ca-RCPP的文石含量、β、硅胶含量和火山灰活性，但降低文石的L/D。CO2气体通量的增加同样提高了β和硅胶含量，但降低了文石含量和L/D。相关分析表明，在大多数co2活化条件的影响下，这些co2活化质量评价指标之间存在整体协同关系。此外，晶体改性剂浓度、CO2活化时间和CO2活化温度对ca-RCPP CO2活化质量的影响大于CO2气体通量和转速。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.