Strength enhancement of Ca(OH)2 activated ground granulated blast furnace slag-stabilized dredged sediments using Na2CO3

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2025-01-04 DOI:10.1007/s11440-024-02470-1

Ning Ma, Hailong Ye, Clarence Edward Choi, Jiaqi Zhang

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Abstract

The efficiency of alkali-activated ground granulated blast furnace slag in stabilizing dredged sediments with high water contents is suboptimal because the activators become diluted. To improve stabilization efficiency, additives such as nano-CaCO₃ are proposed. However, some of the proposed additives may not be practical owing to their high costs. This study experimentally investigates the addition of Na₂CO₃ for the stabilization of dredged sediment with high water contents (i.e., 100%) using Ca(OH)₂-activated slag. Experimental results show the optimal content of Na₂CO₃ to obtain the highest 28-day unconfined compressive strength of stabilized sediments is 0.2% gravimetrically. Below the optimal content, the strength increases with Na₂CO₃ content. Above the optimal content, a decrease in strength is observed. By examining the reaction products and microstructure of the stabilized dredged sediments, it is observed that the coupling mechanism of cation exchange and calcite precipitation promotes the development of finer capillary pores, leading to a reduction in interpore connectivity and lower structural heterogeneity of the fine capillary pores. Experimental evidence from this study broadens the practical applications of sustainable soil stabilization using additives.

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来源期刊

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.