Neutralization and CO2 fixation behavior of alkaline recycled soil using column tests with CO2 ventilation

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Su Myat Mon, Aya Sakaguchi, Kimitoshi Hayano, Hiromoto Yamauchi
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Abstract

Column tests were conducted to elucidate the pH neutralization and CO2 fixation behavior of alkaline recycled soils permeated with CO2. The ventilation period required for complete CO2 fixation (tEOF) was estimated from the test results of each column. The maximum amount of CO2 captured per gram of dry soil ((mCO2)max) was determined based on the inflow and outflow of CO2 for each specimen. The investigation into the effects of soil density, specimen height, CO2 gas concentration, and flow rate on tEOF and (mCO2)max revealed that tEOF increased with higher dry density (ρd) or specimen height (H), as a denser and larger specimen consumed more CO2 gas. Conversely, tEOF decreased with a higher CO2 gas concentration (C) or flow volume (Q) because a low C or Q resulted in an insufficient CO2 gas supply to match the consumption induced by the reaction. Lower C and Q tended to yield higher (mCO2)max, whereas higher ρd and H resulted in higher (mCO2)max. Furthermore, (mCO2)max increased with tEOF, with a slight reduction in pH after neutralization with increased tEOF. This phenomenon was attributed to the longer ventilation period enabling more Ca to react with the CO2 gas and maintain the equilibrium state of the reaction. Finally, the evaluation of the CO2 consumption rate (CSR) for each column specimen revealed that a higher C and Q resulted in a lower CSR, whereas a higher H resulted in a higher CSR. Additionally, a longer tEOF was associated with a higher CSR, although some variation was observed.

通过柱试验研究了渗透CO2的碱性再生土的pH中和和CO2固定行为。根据每个塔的测试结果估计完全CO2固定(tEOF)所需的通风时间。每克干土捕获的最大二氧化碳量((mCO2)max)是根据每个样品的CO2流入和流出来确定的。研究了土壤密度、试样高度、CO2气体浓度和流速对tEOF和(mCO2)max的影响,发现tEOF随干密度(ρd)和试样高度(H)的增大而增大,因为试样密度越大、体积越大,消耗的CO2气体越多。相反,tEOF随着CO2气体浓度(C)或流量(Q)的升高而降低,因为低C或低Q导致CO2气体供应不足,无法匹配反应引起的消耗。较低的C和Q倾向于产生较高的(mCO2)max,而较高的ρd和H倾向于产生较高的(mCO2)max。此外,(mCO2)max随tEOF的增加而增加,中和后pH随tEOF的增加而略有降低。这一现象归因于较长的通风时间使更多的Ca与CO2气体反应并保持反应的平衡状态。最后,对每个柱样的CO2消耗率(CSR)的评估表明,较高的C和Q导致较低的CSR,而较高的H导致较高的CSR。此外,较长的tEOF与较高的CSR相关,尽管观察到一些差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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