For the reinstatement of large areas of concrete
pavements and floors to avoid the total replacement
of bays. The product is alkaline in nature and will
protect embedded steel reinforcement. It may be
used internally and externally.
For emergency patching of small areas of concrete
pavements and floors, the use of SpECtop RSR is
recommended.
. Rapid strength gain will generally accept
pedestrian traffic at 12 hours, significantly
reducing down-time.
. High strength, abrasion and weather resistance.
. Single component product eliminates site
batching and requires only the site addition of
clean water.
. Excellent bond to the concrete substrate.
. Shrinkage compensated.
. Contains no chloride admixtures.
Notes
To avoid possible reflective cracking in the SpECtop
CRM repair, it is essential that live cracks and
existing joint details in the substrate be given proper
attention. Live cracks should be treated by an
approved method. For further information, contact
SpEC Technical Department.
Preparation
Saw cut or cut back the extremities of the repair
locations to a depth of at least 12mm. Break out
the complete repair area to a minimum depth of
12mm up to the sawn edge.
The surface should be clean and free from
contamination. Where breaking out is not required,
roughen the surface and remove any laitance by light
scabbling or grit-blasting.
Oil and grease deposits should be removed by
steam cleaning or detergent scrubbing and the
effectiveness of decontamination assessed by a
pull-off test.
Expose fully any corroded steel in the repair area
and remove all loose scale and corrosion deposits.
Steel should be cleaned to a bright condition paying
particular attention to the back of exposed steel
bars. Grit-blasting is recommended.
Where corrosion has occurred due to the presence of
chlorides, the steel should be high pressure washed
with clean water immediately after grit blasting.
The prepared area should be blown clean with
oil-free compressed air and allowed to dry
completely.
Priming
Reinforcing Steel
Apply one coat of SpECcoat Zn25 to all exposed
reinforcing steel and allow to dry before continuing.
If any doubt exists about having achieved an
unbroken coating, a second application should be
made and, again, allowed to dry before continuing.
Substrate
Prime using SpECbuild Primer E1.
Both of the components should be briefly stirred
to ensure that any settlement products are fully
suspended.
The entire contents of the curing agent should be
emptied into the base component, ensuring that the
sides of the curing agent tin are carefully scraped to
remove all the material.
The combined materials should then be mixed using
a suitable slow-speed drill and mixing paddle for 2
minutes until uniform. The sides of the tin should
then be scraped and mixing should continue for a
further 2 minutes. The mixed product may be
applied by brush at a theoretical consumption rate of
5 m²/litre/coat.
Mixing
SpECtop CRM is a ready to use blend of dry
powders.
Care should be taken to ensure the SpECtop
CRM is thoroughly mixed. A forced action mixer
is essential. Mix in a suitably sized drum using a
SpECbuild Mixing Paddle in a slow speed (400/500
rpm) heavy-duty drill. Free- fall mixers must not
be used. Mixing of part bags should never be
attempted.
Place 2.3 litres of water
into the mixing vessel
and with machine mixing,
slowly add the bag of
SpECtop CRM and mix
for 3 minutes until fully
homogeneous. Do not mix
for longer than this period
as the heat developed will seriously reduce the pot
life of the mixed product. Note that powder must
always be added to water.
Application
While the SpECbuild Primer E1 is still tacky,
apply SpECtop CRM evenly by trowel and tamp in
place with a wood float to ensure full compaction.
Thoroughly compact the mortar around any exposed
steel reinforcement. SpECtop CRM can be applied
up to 50mm thickness in single
applications.
Note: The minimum applied thickness of SpECtop
CRM is 12mm.
SpECtop CRM is supplied in 25 kg bags yielding
approximately 11.5 litres (0.9m² at 12mm
thickness).
Contact us for more info.
