Durability of Hydrostab; a field investigation and prognosis
2005
Boels, D. | Bril, J. | Hummelink, E.W.J. | Boersma, O.H.
Eight years after installation on a test site, the enclosing properties of Hydrostab are undiminished and satisfy the requirements of the Dutch Decree on Soil Protection for Disposal to Landfill (“Stortbesluit” 1993). Also no change was found in the moisture content. Analysis of the processes and components that determine the characteristics of Hydrostab shows that C-S-H- and C-A-H-gels form from fly ash which subsequently fall apart and produce silica gels. In this process the capillary pore space initially decreases. Only after transformation of all C-S-H and C-A-H into silica-gel the amount of gel in the soil pores decreases slowly, producing the final end product quartz. In this process the capillary pore space increases. When the value of the capillary pore space increases above 0.18, the sealing properties of Hydrostab decrease. This moment in time can therefore be marked as the end of the functional lifetime of the Hydrostab. Dependent on model parameterization this moment is 180 - 500 years in the future
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