Laboratory test study on the effect of freeze–thaw cycles on strength and hydraulic conductivity of high water content stabilized dredged sediments

Abstract

Dredged sediments with initial water contents between 200% and 400% were treated with single and composite binders. Samples were subjected to open and semi-closed freeze–thaw (f–t) cycles to investigate the impact of f–t cycling on hydraulic conductivity (HC) and unconfined compressive strength (UCS). A grace period (GP) for thaw consolidation is included to assess healing potential of the affected stabilized mass. Findings of this study show that the impact of f–t cycles depends on initially achieved UCS and HC values prior to the f–t cycling and time of testing after f–t cycles. The HC of specimens with an initial UCS value of 87 kPa increased with number of f–t cycles. The UCS values decreased in the range of 50%–80% when specimens were tested directly after the thaw period and values decreased in the range of 14%–60% when specimens were tested at the end of the GP. The HC of specimens with an initial UCS value of 299 kPa remained almost the same. These samples experienced permanent loss in the UCS values, irrespective of time of testing. Detrimental effects of the freezing action on the UCS were greater under semi-closed than open freezing conditions.

Stabilization and solidification of metal and organotin contaminated sediment after electrochemical pretreatment

“…Thus, this indicates that the standard procedure using water with low ionic strength could misjudge the performance of the S/S sediment in eld conditions (Drincic, et al, 2017). Additionally, in a cold climate such as in Sweden, freeze-thaw cycles could affect the strength and leachability of the matrix, as water within the stabilized sample expands during freezing and could cause micro-cracks (Makusa, et al, 2016). Thus, it could be of interest to see how freeze-thaw cycles would in uence the strength and leaching characteristics of the electro and original stabilized sediment, as well as investigate other pretreatment methods to lower TBT and metal content before stabilization.…”

Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications

“…However, most of the experimental evidence dealing with THM soil behaviour is related to radioactive waste disposal problems, and involve much wider temperature ranges, typically from 20 • C to 100 • C (e.g., [23][24][25]). Other geomechanical/geophysical topics where soil THM behaviour is relevant include the analysis of catastrophic landslide collapse (e.g., [187][188][189][190]), rapid slip events in faults (e.g., [191,192]), and the effects of freezing-thawing cycles on soil mechanical properties (e.g., [193][194][195]). However, overall, there is a relative lack of experimental data on soil THM behaviour, although the scientific community has acknowledged the importance of this subject for several engineering applications.…”

Effect of freeze-thaw cycles on water permeability of sand mixtures with nanoclay

“…Промерзание глинистого экрана сопровождается морозным пучением, формированием линз и прослоек льда из влаги, мигрирующей к фронту промерзания. В глине появляются микротрещины, изменяются ее микроструктура и размер пор, что ведет увеличению водопроницаемости экрана после оттаивания [2][3][4][5]. Установлено, что наибольший эффект дает первый цикл промерзанияоттаивания, а после 4-5 циклов значения водопроницаемости практически стабилизируются [2,3,[6][7][8][9].…”