Superplasticiser EB 821-P
High
Early Strength Concrete Superplasticiser
Conforms to BS 5075 Part 3 and ASTM C494
Types A and F
DESCRIPTION
Superplasticiser
EB 821-P is a high quality chloride-free
superplasticiser containing sodium naphthalene
sulphonate polymer.
It is specifically
formulated for the production of very high early
and ultimate strength concrete, for example,
precast concrete where early demoulding is
essential for time and cost savings.
Superplasticiser
EB 821-P can be dosed into ready-mixed concrete
at site to improve its workability and
flowabilty without causing bleeding and
segregation; and hence enables the concrete to
be placed and compacted even when it is heavily
reinforced and to prevent honeycombing.
Superplasticiser
EB 821-P may reduce the required mixing water by
20 to 25% while achieving very high early and
ultimate strength concrete.
TYPICAL PROPERTIES
Produces very high early strength
concrete which enables precast
concrete units to be demoulded in
10-16 hours by reducing water-cement
ratio.
Provides faster and easier placing
and compacting
of concrete around heavy
reinforcements by improving
workability at given water-cement
ratio.
Enables the production of high
density water-fight concrete, and at
the same time gives better corrosion
protection to the steel
reinforcements.
"Superplasticiser
EB 821-P" should be specified by name and used as
per application instructions below.
APPLICATION PROCEDURES
Dose
Superplasticiser EB 821-P together with gauging
water at the batching plant at the recommended
rate of between 800ml to 1700ml/100kg of cement,
into the concrete mix.
Superplasticiser EB 821-P Maybe dosed at site
into the ready-mixed concrete truck.
Mix thoroughly
to acieve a homogenous mix.
The optimum
dosage of Superplasticiser EB 821-P should be
determined by site trial.
Note: Severe
over-dosage results in the following:
Increases the
normal initial setting time of the concrete;
Leads to
excessive workability of the concrete;
and
Increases air
entrainment in the concrete.
However, the
ultimate strength of the concrete will not be
adversely affected as a result of over-dosage if the
concrete is properly cured and formwork stripping is
properly conducted.
