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TECHNICAL BULLETIN |
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| 10.200 - FIBERCEMENT PRODUCTS |
High Reactivity Metakaolin (HRM)
Engineered Mineral Admixture for Use with Portland
Cement
PowerPozz™
is a white pozzolanic mineral admixture
that enhances the performance of Portland cement in many types of cement-based
products. It is particularly well suited
for use in Fibercement.
BENDING
STRENGTH of Fibercement based products are
considerably higher when PowerPozz™ is
used:
·
A High Reactivity Metakaolin, PowerPozz™ combines chemically with calcium hydroxide, creating calcium silicate
and calcium aluminate hydrates.
·
With a consistent particle size
distribution, PowerPozz™ is one order
of magnitude smaller than cement particles.
Thus, PowerPozz™ forms a more
densified paste by filling voids that would otherwise be present in plain
cement compositions.
DIMENSIONAL
STABILITY
·
High Reactivity Metakaolin has been
shown to reduce drying shrinkage
versus comparable silica fume enhanced composites.
·
Reduced
overall permeability will greatly reduce the swelling
and shrinkage associated with all types of exposure conditions.
IMPROVED
BOND STRENGTH
The densified paste system, with enhanced
internal cohesion and adhesion, will reduce the incidence of weak fiber/paste
interfacial zones without increased brittleness, thus improving the strength and toughness of the system.
10.200 - FIBERCEMENT PRODUCTS
EFFLORESCENCE
CONTROL
PowerPozz™
is a lime-hungry pozzolan. It has been
shown to combine with more than its weight equivalence in calcium hydroxide,
helping to prevent Primary Efflorescence
during curing. Filling the spaces
between cement grains will limit internal “bleeding”, thus reducing CaCO3
formation and staining.
In hardened, cured products, PowerPozz™ will help prevent Secondary Efflorescence caused by
wet/dry cycles in two ways:
·
The Ca(OH2)
combines chemically with the High Reactivity Metakaolin and renders the lime
unavailable to be leached to the surface air by migrating moisture.
·
The more dense mixture reduces the
ingress and egress of moisture in the cementitious mixture. When moisture is prohibited from penetrating,
the opportunity for efflorescence is eliminated.
COLOR
NEUTRAL
PowerPozz™
is a white pozzolan. It will not darken
existing compositions. In fact, in
colored products, it offers the solution to problems with pozzolan color
variability by providing quality-assured, lot-to-lot consistency.
SCREEN
RETENTION - HATSCHEK PROCESS
PowerPozz™
platelet-shaped particles will benefit in improved screen retention in Hatschek
processes, providing production gains while enhancing output quality. PowerPozz™ has been engineered to
optimize micropacking, surface area, and reactivity without sacrificing
physical handling and production efficiency.
CONSISTENCY
OF SUPPLY
An engineered product, PowerPozz™ is manufactured to exacting
specifications. Consistent in its
properties and performance, PowerPozz™
delivers reliable results.
EASE
OF USE - No special handling equipment required.