Utilization of fuel oil ash in injection solutions

Abstract

Injection solutions are used to fix the soil in the underground constructions, which requires significant cement expenditure. The study has found that cement can be substituted with up to 40 % of ash from the high-sulphur fuel oil combustion by putting it into injection solutions. During the solution preparation, the ash releases up to 90% of sulphur. The sulphur in the alkaline solution undergoes disproportionation with the production of nanoparticles that fill the cavities in the crystallizing cement stone. This gives cement strength while its amount in the mixture is reduced. The modifier-ash solution ensures ecological safety, which has been proved by measuring phytotoxicity on the radish seeds Raphanus sativus germination.