Stabilization of river dredged sediments by means of alkali activation technology

IF 2.8 3区农林科学 Q3 ENVIRONMENTAL SCIENCES Journal of Soils and Sediments Pub Date : 2024-08-21 DOI:10.1007/s11368-024-03872-0

Karmen Fifer Bizjak, Lea Žibret, Mojca Božič, Boštjan Gregorc, Vilma Ducman

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Abstract

Purpose

Alkali activation process has been applied to fresh river clay-rich sediments in order to increase their mechanical properties and make them suitable for soil stabilization.

Materials and methods

Dredged sediments were mixed with up to 30 mass percent (ma%) of fly ash (FA) or ladle slag (LS) and after curing for 3 days at 60 °C, the bending and compressive strength have been determined. The mixtures which exhibited the highest strengths were further optimized for being used in soil stabilization. For this purpose, the sediment was stabilized with 4 ma% of quicklime (QL) and after 1 h 30 ma% of FA with alkali activator was added and cured for 1, 7 and 28 days.

Results

The stabilized sediment has a significantely better geomechanical performance in comparison with the sediment alone. Stabilizing the dredged sediment using alkali activation technology provides high enough strengths to eventually make it suitable for anti-flood embankments.

Conclusions

The results confirmed the suitability of the investigated technology for soil stabilization.

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利用碱活化技术稳定河道疏浚沉积物

材料和方法将挖出的沉积物与高达 30 质量百分数（ma%）的粉煤灰（FA）或钢包炉渣（LS）混合，在 60 °C 下固化 3 天后，测定其抗弯强度和抗压强度。强度最高的混合物经进一步优化后可用于土壤稳定。为此，用 4 ma% 的生石灰（QL）稳定沉积物，1 小时后加入 30 ma% 的含碱活化剂的 FA，并固化 1、7 和 28 天。使用碱活化技术稳定疏浚沉积物可提供足够高的强度，最终使其适用于抗洪堤坝。

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

Journal of Soils and Sediments 环境科学-土壤科学

CiteScore

7.00

自引率

5.60%

发文量

256

审稿时长

3.5 months

期刊介绍： The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.