Mapepoxy BI/BI-IMP
02.12
Injection
PRODUCT DESCRIPTION
Mapepoxy BI is a very low viscosity
solvent free epoxy, cured with a
polyamine (accelerated or retarded)
for injection into cracks and fissures in
concrete. Hairline cracks considerably
finer than a cement slurry can penetrate
can be filled and sealed.
Mapepoxy BI has a higher mechanical
strength than cement and the concrete
is effectively “welded” together again
and regains most of its monolithic
properties.
Mapepoxy BI-IMP has a slightly lower
viscosity than Mapepoxy BI and is well
suited for sealing and injection of
concrete constructions and voids in
floors. Because of its low viscosity a
very low injection pressure can be used .
Mapepoxy BI-IMP is slightly diluted,
which means that it has a lower viscosity
and modulus of elasticity than
Mapepoxy BI. For structural gluing, it is
best to use Mapepoxy BI.
Mapepoxy BI-IMP consists of two
components, comp. A and comp. B.
The hardener (comp. B) is available as
two variants, accelerated or retarded.
DIRECTIONS FOR USE
Evaluation
Before injecting the cause of the cracks
or fissures should be identified. If the
cause is still present, the cracks or
fissures may reappear beside the old
ones. A general picture should be
formed of the crack depth and width,
plus the concrete quality, if the cracks
are contaminated or filled with water.
The purpose of the repair should be
clear: corrosion protection, sealing or
recovery of strength.
Sealing
Injection nipples, copper piping or plastic
hose parts are drilled into or glued along
the crack at 15 – 70 cm intervals .
Use a filler along the crack and round
the nipples or hose parts. The crack must
be sealed on both sides. The epoxy will
take path of least resistance out. In some
Manufacturer:
Mapei AS
Vallsetvegen 6, 2120 Sagstua, Norway
Tlf: +47 62 97 20 00 Fax: +47 62 97 20 99
[email protected]
www.mapei.com
cases, if the concrete is poor or the
injection pressure high it is necessary
to drill holes for the nipples and cut a
V-shaped groove for the filler.
Very fine cracks are easily sealed by
the drill sludge. For the filler use a
rapid setting cement mortar, Rapp or
an epoxy mortar Mapepoxy MS.
Rapp can be injected after ca. 15 min.
hardening, while the epoxy mortar
requires over night hardening.
Mixing
Components A and B should be
between +15 – 20°C during mixing.
Mapepoxy BI mix comp. A (red) and
comp. B (blue) thoroughly for
3 – 5 minutes until the mixture is a
brownish black colour.
Use a slow drill with whisk attachment
for mixing. For large scale work manual
mixing should be avoided, an automatic
mixing pump can be used.
Mix Mapepoxy BI-IMP by shaking
comp. A and comp. B together in the
large bottle for 3 – 5 minutes.
Injection
Always begin with the lowest nipple.
The epoxy is squeezed in under pressure
until it comes out of the next nipple, and
is then injected further from this etc.
In this way the cracks are filled.
The epoxy should be kept under pressure
in the crack for a wh ile. This must be
done after the crack has been filled.
Normal injection pressure is from
1 – 5 bar, however 10 – 30 bar is not
unusual, and in special cases up to
100 bar may be used.
For repair of voids in the floor a series of
holes is drilled into the plaster, followed
by injection holding a tightly closing
conical pipe (mouth piece) down in
the hole, or alternatively an expanding
injection rod. Cracks in the floor or other
surfaces where a compact seal is desired
can be brushed over (painted) with
epoxy. They may be scored, painted over
and then filled.
Mapepoxy BI-IMP can be introduced
directly into cleaned cracks using a spray
bottle.
Pumps
For very small scale work a grease gun
can be used. A simple garden sprayer
where the pump is situated on the
outside can also be used.
A small pressure tank with a tap for
epoxy on the bottom is more reliable.
By using compressed air with an air
pressure regulator a single component
Polyplan pump can be set to give a
suitable injection pressure.
Effectivity
Effective sealing will stop leakages.
Corrosion protection and recovery of
strength are much more difficult to
control. Samples can be bored out,
evaluated visually, strength and elastic
modulus can be determined. It has also
been discovered that using a drilling
hammer as a vibration source on cracked
concrete gives varying results, depending
on where the source of vibration is
placed. An effective repair gives a
constant result
CLEANING
Clean pumps and equipment with
thinner after use.
SAFETY INSTRUCTIONS
For health, safety and environmental
information, see separate safety datasheet at www.mapei.com.
Mapepoxy BI/BI-IMP
NOTE
The technical recommendations and
details given in this description represent
our present knowledge and experience of
the products. All the above information
must nevertheless be treated as advisory
and subject to due consideration.
Any person using the product must satisfy
himself in advance that the product is
suitable for the intended use.
Users will themselves be responsible if
the product is used for other than the
recommended purposes or is used
incorrectly.
All deliveries from Mapei AS are made in
accordance with the sale and delivery
conditions applicable at the time, and
these conditions are taken to be accepted
on placement of an order.
02.12
TECHNICAL SPECIFICATIONS
Mapepoxy BI:
Specific weight:
1.1 g/cm3
Temperature oC:
Viscosity cps:
5oC
600
10oC
400
20oC
190
30oC
100
Colour:
Brown / black (transparent)
Mixing indicator, i.e. comp. A (red) and comp. B (blue).
Pot life:
Pot life, i.e. time from mixing of epoxy until it must be in
place in the crack is very temperature dependant.
The table below shows the curing time necessary to achieve a
shear strenght of 8 MPa for a bonded cement mortar prisms.
(100% failure in the cement mortar).
Temperature oC:
Accellerator %:
Pot life, min.:
Curing time, hr.:
Shear strength MPa:
30oC
0
16
4.5
8
20 oC
0
40
10
8
20 oC
50
15
8
8
10 oC
50
40
18
8
10 oC
100
15
14
8
5 oC
100
50
20
8
Accelerated gives higher viscosity.
Packaging:
Mapepoxy BI is supplied as two ready
to use components, comp. A and
comp. B. which are packed in the
correct mixing ratio.
Sets of 1 kg and 4.2 kg.
Mapepoxy BI-IMP is supplied in two
bottles ready to use. 1 kg sets.
Storage:
Stored frost free and in unopened
original packaging the product has a
minimum shelf life of two years.
Manufacturer:
Mapei AS
Vallsetvegen 6, 2120 Sagstua, Norway
Tlf: +47 62 97 20 00 Fax: +47 62 97 20 99
[email protected]
www.mapei.com
Shrinkage:
Shrinkage i.e. reaction contraction after gelation, when new
material can no longer flow is very low, approx. 0.7%.
This gives the basis for negligible inner stresses. Adhesion
shear strength has been tested on glued cement mortar
prisms (4x4x16 cm) and gives 100% fracture in the cement
mortar. By gluing wet prisms values of the same order are
achieved (7 MPa), with 50% fracture in the adhesive. Long
term water resistance is very good. No sign of reduction in
shear strength for glued cement mortar prisms after 3 years.
One weeks curing at +20oC gives the following strengths:
Flexural strength:
0% accelerator. 90 MPa
100% accelerator. 100 MPa
(ISOR 178)
(ISOR 178)
Compressive strength:
0% accelerator. 69 MPa
100% accelerator. 75 MPa
(ISOR 178)
(ISOR 604)
Mapepoxy BI-IMP:
Specific weight:
1.05 kg/l
BI-IMP
Temperature oC:
Viscosity cps:
10 oC
170
20 oC
180
25 oC
120
35 oC
70
BI-IMP A
Temperature oC:
Viscosity cps:
10 oC
200
20 oC
120
25 oC
80
35 oC
50
Pot life:
At 5oC:
At 20oC:
BI-IMP
30 min.
BI-IMP A
70 min.
10 min.