SpECbuild SG15 is designed to provide a
structural grade repair mortar particularly in
situations where abrasion resistance and low
permeability are required, such as:
· Repairs to structural concrete elements,
e.g. reinforced beams and columns
· Highly trafficked surfaces, particularly transition
strips adjacent to mechanical bridge joints
· Repairs in marine environments or other
situations where concrete is in contact with
chloride or sulphate solutions
· High bond strength to concrete substances.
· Good abrasion resistance.
· High compressive strength.
· Coefficient of thermal expansion similar to
host concrete.
· Compensated for plastic and long-term
shrinkage
· Low permeability providing protection against
the ingress of chlorides and carbon dioxide
Preparation
It is essential that adequate preparation is carried
out prior to the application of SpECbuild SG15.
This preparation should ensure the removal of all
grease, oil and loose material.
The area to be reinstated using SpECbuild SG15
should be cut back to a depth of at least 10mm.
To avoid “feather edging”, it is advisable to neatly
delineate the repair boundary by saw cutting to a
depth of 10mm.
All corroded steel should be completely exposed
including the rear of the bar to enable thorough
cleaning. It is recommended that grit blasting be
used to clean the reinforcing steel and particular
attention should be paid to the rear of the bar to
ensure all corrosion products have been removed.
Once the reinforcing steel has been cleaned it
should be coated immediately with one coat of
SpECcoat Zn25.
Substrate Priming
For most situations, the substrate should be primed
with SpECbuild Primer S1. Initially the surface
should be thoroughly saturated without standing
water prior to the primer being applied by brush,
ensuring intimate contact with the substrate. This is
best achieved by using a circular scrubbing action.
SpECbuild SG15 can be applied as soon as the
primer becomes tacky.
To provide an exceptionally high strength, sealed
bond to the substrate (e.g. to repair chloride
induced corrosion damage), SpECbuild Primer E1
epoxy resin bonding agent may be used. One coat
should be applied and allowed to gel. A second
coat should then be applied and used to provide
the bond.
Where SpECbuild SG15 is applied by spray, then
sharp sand may be broadcast into the surface of
the second coat of SpECbuild Primer E1 and be
allowed to dry.
Mixing
SpECbuild SG15 is a one-part cementitious repair
compound.
For mixing a single bag, a
25 litre steel pail is
suitable, using a slow
speed electric drill
(350/600rpm) fitted with
a SpECbuild Mixing
Paddle. Where larger
quantities of material need to be mixed at one
time a compulsory mixer is required. Do not
attempt to use free-fall mortar mixers as they do
not impart sufficient shear to adequately mix the
repair
compound.
Place 2.25 to 2.75 litres of clean water in the mixing vessel and slowly add the contents of the bag
with the mixer running. The product should be
mixed for a minimum of 5 minutes. Do not attempt
to use the product if it has not been mixed for the
minimum time, as a loss in the performance of the
product is likely which could result in failure of the
repair.
This product cannot be mixed by hand.
Application
The material should be applied by a gloved hand
to ensure thorough compaction around the
reinforcement and against the edges of the
reinstatement area. The repair is then trowel
finished.
The product can be applied up to 15mm in
thickness in vertical, unsupported situations and
up to 40mm in recessed, supported repairs. The
product can be applied in 100mm layers in the
horizontal plane. The material should not be
applied at less than 10mm thick.
Curing
SpECbuild SG15 should be cured using a
SpECcure WE. In extreme drying conditions a
second coat should be applied immediately the first
coat has dried.
Product Packaging
Coverage
SpECbuild SG15 25kg bags 1.1m²@
10mm thick
Contact us for more info.
