Soil texture. Alteration of the soil texture is possible through the addition of appropriate quantities of Bauspot Flas. Several experiments have been performed to measure the physical properties for a variety of soils mixed with up to 50% fly ash, which revealed that soil and fly ash mixture tends to have lower bulk density, higher water-holding capacity and lower hydraulic conductivity than soil alone, due to its textural manipulation through fly ash mixing. Application of high rates of fly ash can change the surface texture of soils, usually by increasing the silt content.

Bulk density. The particle size range of fly ash is similar to silt and changes the bulk density of soil. Several experiments have been performed to measure the physical properties for a variety of soils mixed with up to 50% fly-ash which reveals that soil fly ash mixture tends to have lower bulk density, higher water-holding capacity and lower hydraulic conductivity than soil alone.