TY - JOUR
T1 - Recycling dredged mud slurry using vacuumsolidification combined method with sustainable alkaliactivated binder
AU - Song, Ding Bao
AU - Chen, Wenbo
AU - Yin, Zhenyu
AU - Shi, Xiu Song
AU - Yin, Jianhua
N1 - Funding Information:
This research was supported by the Research Grants Council of Hong Kong Special Administrative Region Government of China (Grant No.: 15209119 , 15210322 and R5037-18 ). The authors also acknowledge the financial supports from grants (CD7A and CD82) from Research Institute for Land and Space of Hong Kong Polytechnic University and financial support from grant (BBEJ) from Research Centre for Resources Engineering towards Carbon Neutrality, and a grant (BD8U) from Hong Kong Polytechnic University .
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/10
Y1 - 2023/10
N2 - Dredged sediments with high water content is difficult to be treated and beneficially reused because of their poor engineering characteristics. To treat those slurry, this paper introduces a novel mechanical-chemical combined method, i.e., vacuum-solidification (VS) combined method, and investigates its performance in dewatering and strength improvement. Corresponding model tests using vacuum-only preloading method and binder-only solidification method, respectively, were conducted. Ground granulated blast-furnace slag, an industrial by-product, activated by hydrated lime, magnesium oxide or carbide slag was used as the binder in the proposed method. The mass of discharged water due to vacuum consolidation was measured during the model test. Soil samples were taken after vacuum preloading for unconfined compression test, permeability test, X-ray diffraction, scanning electron microscopy and mercury intrusion porosimetry to analyze the strength development, hydraulic and microstructural properties of the treated soil. The results indicate that the VS combined method exhibits a remarkable enhancement in both volume reduction efficiency and the strength improvement effectiveness. The type and content of activators have an obvious influence on the performance of the combined method. This study preliminarily revealed the mechanism and effect of using the VS combined method with alkali-activated GGBS as binder to treat high water content dredged mud.
AB - Dredged sediments with high water content is difficult to be treated and beneficially reused because of their poor engineering characteristics. To treat those slurry, this paper introduces a novel mechanical-chemical combined method, i.e., vacuum-solidification (VS) combined method, and investigates its performance in dewatering and strength improvement. Corresponding model tests using vacuum-only preloading method and binder-only solidification method, respectively, were conducted. Ground granulated blast-furnace slag, an industrial by-product, activated by hydrated lime, magnesium oxide or carbide slag was used as the binder in the proposed method. The mass of discharged water due to vacuum consolidation was measured during the model test. Soil samples were taken after vacuum preloading for unconfined compression test, permeability test, X-ray diffraction, scanning electron microscopy and mercury intrusion porosimetry to analyze the strength development, hydraulic and microstructural properties of the treated soil. The results indicate that the VS combined method exhibits a remarkable enhancement in both volume reduction efficiency and the strength improvement effectiveness. The type and content of activators have an obvious influence on the performance of the combined method. This study preliminarily revealed the mechanism and effect of using the VS combined method with alkali-activated GGBS as binder to treat high water content dredged mud.
KW - Alkali-activated GGBS
KW - Dredged sediments
KW - Mechanical properties
KW - Microstructure
KW - Model test
KW - Vacuum preloading
UR - http://www.scopus.com/inward/record.url?scp=85161651390&partnerID=8YFLogxK
U2 - 10.1016/j.geotexmem.2023.05.003
DO - 10.1016/j.geotexmem.2023.05.003
M3 - Journal article
SN - 0266-1144
VL - 51
SP - 104
EP - 119
JO - Geotextiles and Geomembranes
JF - Geotextiles and Geomembranes
IS - 5
ER -