- Environmental Science; toxikanty; prostředí; solidifikace; Poutants; Environment; Solidification
The influence of organic plasticizers based on Mg lignin-sulphonates (LS), naphthalene derivatives (NF) and melamine-formaldehyde polycondensates (PC) on the parameters of solidified FBC-P (fluidised bed combustion product) was tested. Water-reducing effectiveness of the additives tested increases in the following order: NF, PC, LS. All additives cause a marked increase in compressive strength of solidified specimens prepared from suspension of constant workability and reduced amount of mixing water. The compressive strength increases predominantly with the volume weight of specimens and the time of hardening. The conductivity of leachate of modified specimens has tendency to decrease with the dose of additives and to increase with the time of leaching up to about 100 days of leaching and afterwards it decreases. UV spectral analysis showed that the content of LS and PC molecules in the leachate after 24 hours of leaching is very low, near to the detection limits of the method used.