High-rise concrete may require high compressive strength, pumpability over long distances and stable workability during placement. Microsilica can improve particle packing and later-age matrix density, which makes it useful in performance-oriented binder systems.
Its fine particles increase water demand and can change rheology. The mixture therefore needs an appropriate high-range water reducer, controlled aggregate grading and trial pumping where the delivery distance is demanding. Designers should also review autogenous shrinkage, heat development and curing.
Before ordering
- Confirm the project standard and target strength age
- Run compatibility trials with the selected cement and admixture
- Specify densified or undensified form for plant handling
- Check moisture, LOI and oversize limits
- Plan enclosed transfer and dust control
Typical grade information is available on the Hyborton microsilica page.