VCAS- Micron HS (vitreous calcium aluminosilicate) pozzolan is a custom
engineered, high performance supplementary cementing material for use in GFRC,
and any mortar or concrete products.
It is manufactured by heating a blend of ground scrap E glass fibers, lime,
and alumina compounds to a molten state which is then solidified by quench
cooling, processed, and ground to a fine white powder with highly-reactive
The whole reason for the development of AR glass fiber was that E glass
fibers, which have been available for many years as a reinforcing fiber for all
types of resins and plastics, could not be used in Portland cement because the
fibers would react with the alkalis in the cement, similar to what pozzolans
do. By grinding up the E glass fibers this increases the reactivity many fold
and makes the fine powder a genuine pozzolan.
VCAS-Micron HS is a white powder and is particularly suitable for use with
white cement. In GFRC It is usually added at the amount of 25% replacement of
the Portland cement. At this level it improves long term properties of GFRC and
also significantly reduces efflorescence.