Durability is of decisive importance and sulfate attack is a constantly occurring and challenging phenomenon
This is especially true in the case of production of precast tunnel lining segments for TBM and rock support applied by sprayed concrete. In excavations in which high sulfate attack is anticipated, it is difficult to fulfill all technical requirements unless appropriate measures regarding the concrete mix design are also taken. For sprayed concrete the use of alkali free accelerators is mandatory to achieve adequate sulfate resistance.
Sika® set Accelerator