Wiking® Micro Fibres disperse in the concrete forming a 3D matrix which prevents cracks caused by plastic shirnkage in the drying phase of concrete.
Our polypropylene construction fibres can be added to concrete along side traditional steel reinforcement - or as an alternative. Made from virgin polypropylene, the fibres are designed to strengthen concrete, prevent the formation of cracks and result in a beautiful and durable finish.
Compared to steel fibres our Wiking® Fibres:
Mix multiple fibres together and create a concrete mix with multiple advantages!
Want to find out about all our fibres, their uses and features? Download the info now!
Concrete exposed to harsh weather conditions, heavy traffic and continually moist environments may result in early deterioration. Adding Wiking® Construction fibres will increase the concrete's ability to resist these external forces and slow the deterioration process.
Resistance to frost and thaw
During the drying/hardening phase of outdoor concrete, Wiking® Construction fibres will decrease the impact of climatic conditions. The fibres will cause the tensile strength to develop early in the hardening phase, reducing both the size and frequency of cracks.
In the hardened state, Wiking® Construction fibres enable the concrete to become more durable and protecting it against damage caused by cycles of freezing and thawing.
Wiking® Construction fibres also ensure a high level of impact resistance in concrete. This can be credited to the high level of energy absorbed through refraction, stretching and pulling of the ﬁbres after the cement binding agent has vanished.
An improved adhesive quality in the cement binding agent also leads to a more ductile and durable concrete surface.
Fires in tunnels can result in tremendous tragedy that can be avoided. The prevention of explosive fragmentation of concrete has become crucially important for ensuring safety.
Explosive fragmentation in concrete tunnels
The phenomenon of explosive fragmentation occurs when concrete is exposed to high temperatures, e.g. in case of a hydrocarbon ﬁre.
In tunnel construction a condensed high-quality concrete is used that has a low permeability. This means that pores in the concrete are easily saturated with moisture. In case of fire, heat will cause the moisture to evaporate, which lease to increased pressure inside the concrete pores and the concrete will explode.
Reducing the risk of explosive fragmentation
A range of our Wiking® Micro Fibres have been developed to reduce the risk of explosive fragmentation in concrete. When added to concrete, the fibres increase the permeability of the concrete during heating, reducing the pressure in the pores. and therefore the risk of explosive fragmentation.
This is achieved because the Wiking® Micro Fibres will begin to melt at 160°C and at 360°C the ﬁbres will be completely dissolved. This adds millions of capillaries to the concrete through which moisture can escape. No pressure = No explosive fragmentation.
Increased time to safely escape
The reduction of explosive fragmentation allows rescuers more time to gain control of the fire and evacuate people, saving lives. Studies show that Wiking® Micro Fibres can increase the available escape time from 20 minutes to 70-90 minutes!
Wiking® Micro Fibres for tunnels have been approved in accordance with AbZ (Allgemeine bauaufsichtliche Zulassung – German national construction approval). This guarantees that our fibres meet the required levels of quality in relation to tensile strength and passive fire protection. Only three companies in the world hold this certification for tunnel fibres.
Most concrete ﬂoors are exposed to external forces that may weaken the quality of the concrete over time. Concrete reinforcement is vital for securing a strong and durable indoor concrete floor.
Crack control in concrete floors
In the hardening phase, weather conditions (such as extreme temperatures or strong winds) may cause an excessive amount of bleeding water to evaporate from the concrete surface, leading to the formation of plastic shrinkage cracks.
With Wiking® Construction fibres added to the concrete mix, the amount of plastic shrinkage in the concrete is reduced since the fibres cause the tensile strength to develop earlier in the hardening phase resulting in the prevention of cracks. Wiking® Construction fibres will also prevent the formation of settlement cracks.
Increased strength of concrete floors
The strength and quality of concrete floors may deteriorate due to impacts and traffic from heavy objects and loads (e.g. forklifts, trucks and lorries). Edges between floor units and raised areas of precast concrete are especially at risk of deterioration.
With Wiking® Construction fibres added to the concrete mix, the strength and durability of the concrete will increase. The improved impact strength can be accredited to the large amount of energy absorbed through the refraction, stretching and pulling of the ﬁbres when the cement bonding agent has vanished.
Studies show that the inclusion of fibres can reduce the deterioration of concrete caused by wear and tear by up to 39%.
Many concrete finishers find it difficult achieve the desired finish of concrete with fibre. Traditional polypropylene fibres stay at the surface of the concrete which results in a "fuzzy" finish.
Wiking® Polypropylene Fibres have a special coating that allows the fibres to disperse beneath the surface. This results in a durable, beautifully finished floor without visible fibres.
Shotcrete (i.e. sprayed concrete) is a process where high-strength concrete or mortar is sprayed onto a surface, using compressed air to force the concrete or mortar through a hose at high velocity. This method of application makes shotcrete more durable than ordinary concrete.
Reduced shotcrete rebound
Spraying at high velocity is necessary for achieving a strong and durable result. However, high velocity also means that some material will rebound off the surface, resulting in waste that in some circumstances can amount to up to 40%. This can also impact the thickness of the applied shotcrete making it more prone to shrinkage.
By adding Wiking® Construction fibres to the shotcrete mix, the coherent nature of the mix is strengthened noticeably by binding the cement materials together and reducing the shotcrete rebound considerably reduced.
Reduced plastic shrinkage
Adding Wiking® Construction fibres increases the capacity for tensile deformation at the plastic stage, preventing the occurrence of plastic shrinkage cracks in shotcrete.
Wiking® Construction fibres will also increase the shotcrete’s resistance to frost and thawing by creating a more durable surface that prevents penetration of water and chemical ﬂuids.