English
Magnesium Oxide Expansive Agent is a additive primarily composed of active magnesium oxide (MgO), appearing as a greyish-white or white powder.
It produces stable and controllable volume expansion through a unique hydration reaction, primarily used to compensate for the shrinkage of cement-based materials during the hardening process.
Its core value lies in effectively preventing concrete cracking, significantly enhancing the structure’s durability, impermeability, and integrity.
The resulting Magnesium Hydroxide crystals (Brucite) occupy a larger volume, thereby generating gentle expansion pressure from within the concrete.
This expansion pressure precisely offsets the tensile stress generated by concrete due to temperature drop (thermal contraction) and moisture loss (drying shrinkage), fundamentally preventing the formation of shrinkage cracks.
