Nitobond EP(
Epoxy resin concrete bonding agent) by FOSROC
Uses
For bonding fresh wet cementitious materials to existing
cementitious surfaces. For use on horizontal surfaces or on
vertical surfaces where mortar or concrete can be supported
by formwork. The long ‘open’ life makes it suitable for use
with formwork or where additional steel reinforcement has to
be fitted. The product is ideal for roads, bridges, pavements,
loading bays and factories, and for bonded or granolithic floor
toppings. Nitobond EP is equally suited to internal and external
applications.
Nitobond EP may also be used as part of a repair system
where a substrate/repair barrier is required or where the
substrate is likely to remain permanently damp or wet.
n Can be applied on to dry or damp substrates
n Exhibits high mechanical strength
n Positive adhesion - exceeds that of the tensile strength
of the host concrete
n Slow cure allows time to erect steel reinforcement and
formwork
n Solvent-free - can be used in enclosed locations
Description
Nitobond EP is based on solvent-free epoxy resins containing
pigments and fine fillers. It is supplied as a two-component
material in pre-weighed quantities ready for on-site mixing
and use. The ‘base’ component is white and the ‘hardener’
component is green, providing visual evidence that adequate
mixing has been achieved.
Standards compliance
ASTM C881: Type I, II, III, IV and V, grade 2 class E & F.
Specification
Epoxy bonding agent
The bonding agent shall be Nitobond EP, a two-component
solvent-free epoxy resin. The two components shall be
differentially pigmented in order to ensure visually that correct
mixing has taken place prior to the application. The product
shall achieve 70 N/mm2 compressive strength, 36 N/mm2
tensile strength, 30% elongation, 14 N/mm2 bond strength
and water absorption of 0.05%, when tested in accordance
to ASTM C881: Type I, II, III, IV and V, grade 2 class E & F.
Properties
Test method Typical result
Compressive strength : 70 N/mm2
(ASTM D695)
Tensile strength : 36 N/mm2
(ASTM D638)
Elongation : 31%
(ASTM D638)
Slant Shear Strength : 38 N/mm²
(BS 6319, Part 4)
Thermal Compatibility : Passed
(ASTM C884)
Bond strength : 14 N/mm²
(ASTM C882)
Pull off strength : 2.82 N/mm²
(BS 1881: Part 207)
Water Absorption : 0.05%
(ASTM D570)
Gel time : >10 hours @ 20ºC
(ASTM C881, Cl 11.2) 5 hours @ 40ºC
Viscosity : 64 Poise
(ASTM D2393)
Full cure : 5 days @ 35ºC
4 days @ 45ºC
Maximum overlay time : 12 hours @ 35ºC
5 hours @ 45ºC
Minimum overlay time : 1 hour @ all temps
Design criteria
Nitobond EP is designed with an overlay time of 12 hours at
35ºC and 5 hours at 45ºC, making it more suitable for use
where additional steel reinforcement and formwork has to be
fitted or where temperatures are high. The minimum
application temperature for Nitobond EP is 5ºC. Consult the
local Fosroc office for further information.
Instructions for use
Preparation
Clean all surfaces and remove any dust, unsound material,
plaster, oil, paint, grease, corrosion deposits or algae.
Roughen the surfaces, remove any laitance and expose the
aggregate by light scabbling or grit-blasting.
Oil and grease deposits should be removed by steam cleaning,
detergent scrubbing or the use of a proprietary degreaser.
The effectiveness of decontamination and soundness of the
substrate should then be assessed by a pull-off test.
Mixing
Any steel reinforcement and formwork should be prepared,
cut to size and shape, and made ready for assembly before
mixing commences.
Care should be taken to ensure that Nitobond EP is thoroughly
mixed. The ‘hardener’ and ‘base’ components should be
stirred separately before mixing to disperse any settlement.
The entire contents of the ‘hardener’ tin should then be poured
into the ‘base’ tin and the two materials thoroughly mixed
using a suitable slow-speed drill and mixing paddle for 2
minutes until a fully uniform colour is obtained. The sides of
the tin should then be scraped and mixing should continue
for a further 2 minutes.
Application
Nitobond EP should be applied as soon as the mixing process
has been completed. It should be brush or spray-applied to
the prepared surfaces, being sure to achieve an unbroken
coating across the entire substrate.
The coated substrate should be left for a minimum of one
hour before the new concrete, screed or mortar is placed.
The maximum overlay times (see Properties) should also be
carefully observed. Failure to apply the new concrete, screed
or mortar within the maximum overcoating time will result in
Nitobond EP becoming ‘hard’, thus creating a slip plane rather
than a bonding action.
If the maximum overlay time is missed, then the Nitobond
EP must be mechanically removed and a fresh application
made. The concrete, screed or mortar should then be applied
in accordance with the overcoating minimum and maximum
stated above.
As soon as the Nitobond EP has been applied, any required
steel reinforcement and/or formwork should be erected and
fixed securely in place.
Cleaning
Nitobond EP should be removed from tools, equipment and
mixers with Fosroc Solvent 102 immediately after use.
Hardened material can only be removed mechanically.
High temperature working
Whilst the performance properties of Nitobond EP at elevated
temperatures are assured, application under such conditions
can sometimes be difficult. It is therefore suggested that, for
temperatures above 35ºC, the following guidelines are adopted
as a prudent working regime:
(i) Store unmixed materials in a cool (preferably temperature
controlled) environment, avoiding exposure to direct
sunlight.
(ii) Keep mixing and placing equipment cool, arranging shade
protection if necessary. It is especially important to keep
cool those surfaces of the equipment which will come into
direct contact with the material itself.
(iii) Try to eliminate application in the middle of the day, and
certainly avoid application in direct sunlight.
(iv) Have a ready supply of Fosroc Solvent 102 available for
immediate cleaning of tools after use.
Estimating
Supply
Nitobond EP : 1 and 4 litre packs
Fosroc Solvent 102 : 5 litre cans
Coverage
Nitobond EP : 3.5 - 4.0 m2/litre
Note: The coverage figures for Nitobond EP products are
theoretical - due to wastage factors and the variety
and nature of possible substrates, practical coverage
figures will be reduced.
Nitobond EP 'fast set' suitable for cold weather working can
be made available when specifically requested.
Storage
Shelf life
Nitobond EP has a shelf life of 12 months. Fosroc Solvent
102 has a shelf life of 24 months if kept in a dry store in the
original unopened packs.
Storage conditions
Store in dry conditions in the original unopened packs. If stored
at high temperatures, the shelf life may be reduced.
Limitations
- Nitobond EP should not be applied when the temperature
is below 5ºC or is 5ºC and falling. If any doubts arise
concerning temperature or substrate conditions, consult
the local Fosroc office.
Precautions
Health and safety
Nitobond EP and Fosroc Solvent 102 should not come in
contact with skin or eyes, or be swallowed. Ensure adequate
ventilation and avoid inhalation of vapours. Some people are
sensitive to resins, hardeners and solvents. Wear suitable
protective clothing, gloves and eye protection. If working in
confined areas, suitable respiratory protective equipment must
be used. The use of barrier creams provide additional skin
protection. In case of contact with skin, remove immediately
with resin removing cream followed by washing with soap
and water.
Do not use solvent. In case of contact with eyes, rinse
immediately with plenty of clean water and seek medical
advice. If swallowed, seek medical attention immediately -
do not induce vomiting.
Fire
Nitobond EP is non-flammable.
Fosroc Solvent 102 is flammable. Keep away from sources of
ignition. No smoking. In the event of fire, extinguish with CO2
or foam. Do not use a water jet.
Flash points
Fosroc Solvent 102 : 33ºC
For further information, refer to the Product Material Safety
Data Sheet.
Additional Information
Fosroc manufactures a wide range of complementary products
which include :
n waterproofing membranes & waterstops
n joint sealants & filler boards
n cementitious & epoxy grouts
n specialised flooring materials
Fosroc additionally offers a comprehensive package of
products specifically designed for the repair and refurbishment
of damaged concrete. Fosroc’s ‘Systematic Approach’ to
concrete repair features the following :
n hand-placed repair mortars
n spray grade repair mortars
n fluid micro-concretes
n chemically resistant epoxy mortars
n anti-carbonation/anti-chloride protective coatings
n chemical and abrasion resistant coatings
For more information log on to http://www.fosroc.com/Default.aspx
