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Anti Fire Crack / Micro Crack Preventer

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Asota is the unique producer of the latest generation of anti fire crack and micro crack Preverter fibers in polypropylene

The latest Generation of Fibers for Fibre Concrete

 

Asota is the unique producer of the latest generation of anti fire crack fibers in polypropylene

AFC

Anti Fire Crack

Reduction of fire damage in concrete

General:

asotaŽ AFC has been developed for adding to concrete. This new fibre generation is a hollow fibre manufactured from polyolefin polymer.

Anti fire crack PP fibers with holes for a better performance in concrete if under fire

As concrete aggregates asotaŽ AFC, as well as asotaŽ MCP lead to the minimization of shrinkage cracks during the hardening phase by means of an optimized hardening process. Clear improvements such as for example ductility and durability after 30 days can be achieved.


Advantage:

The special Plus of asotaŽ AFC shows itself in the case of fire:

The residual humidity in concrete is the cause of explosion type flaking on the surface, triggered by the vapor pressure that builds up.

asotaŽ AFC fibers promote the pressure compensation in hot concrete (up to 200 degree C). asotaŽ AFC liquefies at approx. 170 degr. C. However before that asotaŽ AFC offers sufficient clearance and vapor permeability for pressure compensation. This is achieved in particular by the cavities that are spun in lengthwise.

The polymers used begin to decompose from approx. 250 degr. C. This completely frees the channels near the surface and promotes the pressure balance with deep concrete layers. This reduces explosion type flaking to a minimum.

The photos show the result of a fire behavior test using more than 1200 degr.  C furnace temperature and a test duration of 120 minutes.

Concrete without asotaŽ AFC Concrete with asotaŽ AFC
Concrete without asotaŽ AFC

Fig 2

Concrete with asotaŽ AFC

Fig 3

Fig.3 shows significant better test performance


 

Asota is the unique producer of the latest generation of micro crack preverter MCP fibers in polypropylene

MCP

Micro Crack Preventer

A clear improvement of the concrete quality

asotaŽ MCP (Fig. 4) has also been developed for adding to concrete. It improves all major properties of concrete.

Asota is the unique producer of the latest generation of anti fire crack AFC and micro crack preverter MCP fibers in polypropylene

One major advantage is the reduction of cracks due to shrinkage by up to 99,5% with asotaŽ MCP compared to standard concrete.

asotaŽ MCP is a PP fibre with a round cross section and a standard staple length of 6 and 12 mm 

asotaŽ MCP is the ideal product where no fireproofed concrete qualities are of necessity.

 


Applications:

  • Tunnels

  • Foundations

  • Bridges

  • Cement Floors

  • Roadways

  • Fire Walls

  • Finished Products, (Concrete)

  • Cellars

  • Subways

  • Swimming Pools

  • others

 

Impact strength, ductility:

asotaŽ AFC / MCP gives the composite a certain ductility. The three-dimensional embedded elastic material minimizes the susceptibility to brittle fracture without bringing any disadvantage in relation to the strength of the concrete.

For this reason alone fibres are given preference in the manufacture of pre-fabricated parts. to prevent handling and transport damage.

electron microscope view of the surfaces of fracture of a piece of concrete using anti fire crack AFC and micro crack preverter MCP fibers in polypropylene electron microscope view of the surfaces of fracture of a piece of concrete using anti fire crack AFC and micro crack preverter MCP fibers in polypropylene
Fig 5  Fig 6

The illustrations (Fig. 5 and 6) show an expert opinion carried out using an electron microscope on the surfaces of fracture of a piece of concrete using asotaŽ AFC / MCP

The homogenous distribution of the asotaŽ AFC / MCP - fibres clearly showed the fibres all projected from the hardened cement paste matrix individually.

No cluster formation was recognizable. When assessing the fibre surface using 4000 x  magnification (right hand) illustration it could be seen that close particles of hardened cement paste point to a good bond between the hardened cement paste matrix and asotaŽ AFC / MCP - this is achieved using a special finish from asotaŽ AFC / MCP.


 

Effect in green concrete, in the young concrete:

One problem in concrete components is the formation of micro cracks during the hardening or curing time that subsequently widen out to cracks due to shrinkage. Without the addition of asotaŽ AFC / MCP the relevant after treatment only provides a partial counteraction. asotaŽ AFC / MCP takes up the stresses occurring during the hardening process and provides for a balanced level of humidity in the matrix due to the greater retention ability. Less water thus collects on the surface (anti-bleeding) and one can speak of an "internal after treatment" of the concrete here. Many tests have confirmed the increased early strength that can be made use of above all due to reduced casing periods and faster slip-form construction.

 

Reduction cracks due to shrinkage by up to 99.5%

Tests to represent the crack formation were carried out with and without asotaŽ AFC / MCP.

The Test Set-up (Fig.7):

view of a piece of concrete using anti fire crack AFC and micro crack preverter MCP fibers in polypropylene and of one without this fiber

Fig. 8 Cracking - without asotaŽ AFC                        Fig. 9 Cracking - with asotaŽ AFC


 

Key properties

  • asotaŽ AFC / MCP contributes to a clear improvement of the concrete quality

  • asotaŽ AFC / MCP is harmless from a medical point of view, does not enter the lungs as asbestos for example (Prohibited from 1990)

  • asotaŽ AFC has been especially developed for fireproof concrete qualities (pressure compensation by means of cavities) - at the same time however fulfils the function of asotaŽ MCP (improvement of the concrete properties)

  • asotaŽ AFC is used in tunnel construction (inner shell) and therefore makes a significant contribution to safety in case of a fire. The explosion type flaking and pieces of concrete falling down due to excessive heat can almost be avoided

  • asotaŽ AFC and asotaŽ MCP are also used to prevent cracks in asphalt concrete (road construction). The consequently reduced maintenance expenditure can be offset against slight extra costs (use of fibres)

  • Very good results can also be achieved by adding asotaŽ AFC / MCP in grouting compounds, joint adhesives etc.

  • asotaŽ AFC and asotaŽ MCP is chemical resistant

  • asotaŽ AFC and asotaŽ MCP is environmental friendly, does not rot and is corrosion resistant

 


Technical Data:

 

asotaŽ AFC

Anti Fire Crack

Fibre cross section

round

round

Fibre diameter

45 micron

56 micron

Strength [N/mm˛]

> 250

> 250

Elongation [%]

> 100

> 100

Cut lengths * [mm]

6 / 9 / 12

6 / 9 / 12

Fibre proportion [million/kg]

152 / 101 / 76

98 / 65 / 49

Fibre distribution

excellent

excellent

Density [g/cmł]

0.77

0.77

  *… further cut lengths on request

 

Recommended quantities to use:

2 kg asotaŽ AFC per 1 m3 concrete

 

Tests:

The tests were carried out by the TU Vienna, Institute for the Study of Construction Materials, Building Physics and Fire Protection and FTI Faserbetontechnik GmbH.


 

Technical Data:

 

asotaŽ MCP

Micro Crack Preventer

Fibre cross section

round

Fibre diameter

34

Strength [N/mm˛]

> 275

Elongation [%]

> 80

Cut lengths * [mm]

14

Fibre proportion [million/kg]

89

Fibre distribution

excellent

Density [g/cmł]

0.91

  *… further cut lengths on request

 

Recommended quantities to use:

0.9 kg asotaŽ MCP per 1 m3 concrete

 

Tests:

The tests were carried out by the TU Vienna, Institute for the Study of Construction Materials, Building Physics and Fire Protection and FTI Faserbetontechnik GmbH.

 

 

For more information please visit also this page and see the presentation in this link

 

ADVANTAGES of AFC and MCP Fibers

  • Segregation is reduced
  • Hydration is improved
  • Plastic shrinkage cracking is reduced
  • Reinforcing fibers are anchored
  • Impact and abrasion resistance is increased
  • Permeability is reduced
  • Corrosion is slowed
  • Maximizes Toughness Index
  • Lower Cost

Cement, aggregate, and sand tend to settle to the bottom of the concrete. AFC and MCP fibers hold these heavier materials in place for more uniform density. Bleed water is held in the concrete longer for more effective cement hydration. 

AFC and MCP fibers stop most of the cracks created by plastic shrinkage. AFC and MCP fibers act at tiny springs which absorb the sudden shock of impact. This elasticity of fiber firmly anchored in the concrete results in the large increase in resistance to impact and abrasion. AFC and MCP fibers reduce the permeability, slow the migration to primary steel of corrosive elements such as chloride ions. 

The Toughness Index, the ability to sustain a load after first crack, is maximized by using strong fibers which do not pull out under load. Three dimensional secondary reinforcement replaces wire mesh for a better concrete at a lower cost.

AFC and MCP fibers are easy to use. Any concrete admixture may be added to the concrete without any change due to the presence of the fibers. Polypropylene fibers are highly resistant to both acid and alkaline environments. Pumping of the concrete remains the same, and fibers could reduce the amount of pump pressure. 

AFC and MCP fibers are safe to use, non-toxic, non-irritant. AFC and MCP fibers-polypropylene fibers are extruded only from virgin polypropylene resin under extreme quality control standards. They are always identical size, shape, strength, and performance.

 

Tunnel Shells and Fire Protection - Tests and Analysis

Fires occurring in traffic tunnels have to be expected to give rise to maximum temperatures in the order of approx. 1200°C within 5 minutes. Depending on such factors as fire load, ventilation conditions, commencement of firefighting measures and specific local conditions, the temperatures remain at this level for about 30 to 120 minutes before the decaying phase sets in. 

Reinforced concrete inner shells used in traffic tunnels generally are 0.30 to 0.50 m thick. With such thicknesses, spalling concrete, a phenomenon observed during the first 30 minutes of the fully developed fire at the fire-exposed shell surface, can have devastating effects. 

To prevent the concrete from spalling and the shell surfaces from heating too rapidly, the shell surface has to be provided with a plaster or similar means of protection. Another measure designed to prevent spalling is an admixture of polypropylene fibres in the concrete, which in the event of a fire help relieve the steam pressure in the near-surface concrete layers. 

The ISO 9001:2000 and ISO 14001:2004 certified company obliges itself to the continual and further development of the quality department management system.

Certificate ISO 9001 - english (677 KB)
Certificate ISO 14001 - english (172 KB)

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