FASSTT LWA used in the experiment was prepared from fly
ash arising from a Sewage Sludge Incineration Plant, located at
the Municipal Wastewater Treatment Plant in Gdynia, Poland. The
physical and chemical properties of fly ash have been reported
elsewhere (Białowiec et al., 2009a). The FASSTT LWA produced
had particle diameter d60 8.2 [mm], d60/d10 2.27, bulk density
0.88 [g/cm3], hydraulic conductivity Kh 0.52 [cm/s], and squeezing
strength 12.6 [N/mm2]