| Concrete Lends itself
to a variety of innovative designs as a result of its
many desirable properties. Not only can it be cast in
diverse shapes but it also possesses high compressive
strength, stiffness, low thermal and electrical conductivity
and low combustibility and toxicity. Two characteristics
however have limited its use; it is brittle and weak
in tension and develops cracks during curing & due
to Thermal expansion/contraction over a period of time.
Recently, however the development of Fibre-Reinforced
Concrete (FRC) in various fields has provided a technical
basis for improving these deficiencies. |
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This describes the general properties and application of RECRON
3s fibre reinforced concrete used in construction. The thinner
and stronger elements spread across entire section, when used
in low dosage arrests cracking.
Role of RECRON 3s
Controls Cracking:
RECRON 3s prevents the shrinkage cracks developed during curing
making the structure/plaster/component inherently stronger.
Further when the loads imposed on concrete approach that for
failure, cracks will propagate, sometimes rapidly. Addition
of RECRON 3s in concrete and plaster prevents/arrests cracking
caused by volume change (expansion & contraction).
Reduces Water Permeability:
A cement structure free from such micro cracks prevents water
or moisture from entering and migrating throughout the concrete.
This in turn helps prevent the corrosion of steel used for
primary reinforcement in the structure. This in turn improves
longevity of the structure.
Reduces Rebound In Concrete - Brings
Direct Saving &Gain:
RECRON 3s fibres reduce rebound "splattering" of
concrete and shotcrete. The raw material wastage reduces &
results in direct saving in terms of raw material. More importantly
it saves a great deal of labour employed for the job, which
could be completed earlier.
Increases Flexibility:
The modulus of elasticity of RECRON 3s is high with respect
to the modulus of elasticity of the concrete or mortar binder.
The RECRON 3s fibres help increase flexural strength.
Safe And Easy To Use:
RECRON 3s fibres are environmental friendly and non hazardous.
They easily disperse and separate in the mix.
Economical:
Only 0.2-0.4% by cement RECRON 3s is sufficient for getting
the above advantages. Thus it not only pays for itself,
but results in net gain with reduced labour cost & improved
properties. Leads to faster completion of the job work.
RECRON 3s is a specialty fiber developed after extensive research
at Reliance Technology Centre.
Primary Applications:
· Plain concrete & Wall plastering
· Footings, foundations, walls and tanks
· Pipes, burial vaults, pre-stressed beams
etc.
· Manhole covers & tiles etc.
· Roads & pavements
· Bridges and dams
Field results show that with a dosage of only 125 gms per
bag of cement weighing 50 kgs (0.25%) there is improvement
in
1. Compressive strength Increase by 15 % with 0.5 % fibre
2. Thermal cracks significant reduction.
3. In mortar cubes Without fibres break on their own
With fibres no cracks
4. Thermal crack resistance Excellent with fibres.
5. Rebound loss Reduced by 50% resulting in saving in labour,
Raw material & faster pace of work
Fabrication:
Before mixing the concrete, the fibre
length, amount and design mix variables are adjusted to
prevent the fibres from balling. Fibre-reinforce cement
boards contain no coarse aggregate. These products are usually
made, by spraying mortar and fine cut fibre simultaneously.
Mortar with a high water:cement ratio is used to facilitate
spraying. Other application methods include simple casting,
which is less versatile than spraying, and press moulding
which results in a lower effective water:cement ratio, thus
producing a stronger product. Superplasticizer,
when added to fibre-reinforced concrete, can lower water:cement
ratios, and improve the strength, volumetric stability and
handling characteristics of the wet mix.
Specifications:
| Denier |
1.5d |
| Cut length |
6mm, 12mm….
24mm |
| Tensile Strength |
~ 6000 kg/cm2 |
| Melting point |
> 250ºC |
| Dispersion |
Excellent |
| Acid resistance
|
Excellent |
| Alkali resistance |
Good |
Dosage Rate:
Standard Dosage............................. ~ 125-200gm
per 50kg bag of cement. Optimised as per application.
Direction for use:
It is recommended that the required quantity be soaked for
a minute in water. This water is then added to the cement
batch and batch is mixed as usual to get excellent dispersion.
Conditions:
All information supplied is in good faith as being typical
of the product but no warranty is given or implied.
Application:
- Paper Industry
- Cement Industry
- Battery Industry
- Wer Laid non-wovens
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