K-CELL

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K-CELL– cellulose additives for SMA – Stone Mastic Asphalt. Due to their 3D structure, cellulose fibers maintain a comparatively high viscosity of bitumen, thus preventing its seepage and formation of asphalt mix segregation at high temperatures during storage, transport and SMA placing. At the same time they enable creation of a thicker bitumen layer around each rock particle, thus preventing oxidation, moisture penetration and lifting or cracking of the aggregate.

K-CELL made of cellulose fiber is very safe and easy in handling. We strongly recommend to pay attention to the below mentioned aspects of use. The advantage of micro granules is the quicker distribution in the mineral mass during dry mixing. Microgranules release K-CELL Fibers easily and safely for increased efficiency and improved production quality. K-CELL is ideal for use in automated batching.
They are pellets composed of cellulose, mineral and/or synthetic fibers that reinforce and thicken bitumen. These pellets are suitable to obtain high-performing asphalt pavements. Fibers are used to stabilize bitumen in porous and semi-porous asphalt concrete and in Stone Mastic Asphalts (SMA). By reinforcing and thickening bitumen, these products extend the asphalt pavement service life.

FIBRE-REINFORCED ASPHALTS

High road technology for utmost comfort
Starting in the 1980s, the development of research aimed at studying the behaviour of materials to be used in the road construction sector led to the development and use of highly porous bituminous mixes with draining and sound-absorption properties, as well as of mixes with high complex modulus capable of ensuring a long service life even on roads
with high traffic volume.

Thanks to the open structure of the mix, porous asphalts prevent dangerous puddles from forming on the surface, thus avoiding the aquaplaning effect on high-speed roads.
High porosity also means that roads can absorb and dissipate noisy vibrations caused by the impact of tires on the surface, turning them into thermal energy inside the air voids in the mix.
The need to use high percentages of modified bitumen in porous asphalts and to ensure the durability of high modulus paving is effectively satisfied with the use of microfibers of mineral, synthetic or natural origin as veritable cross-linkers inside the bituminous structure.

How it interacts with the bitumen and with the bituminous mix

Modifying the bituminous binder through homogenization with polymers (elastomers and/or plastomers) offers no absolute guarantee in terms of mix durability, so it is advisable to use one of the products of the K-CELL in order to obtain a synergic mechanical action with the bitumen.

K-CELL cut down on the diffusion and progression of microscopic cracks inside the bitumen film, which are the root cause of many of the damages which bituminous mix is subject to.
K-CELL’s compatibility with bitumen makes it possible to increase the thickness of the binder films on the aggregates, thus improving parameters such as cohesion, fatigue strength and complex modulus.
A three-dimensional network forms inside the bituminous mix that, depending on size and geometry, carries out a micro-reinforcement function inside the binder matrix. This way, for the composite material the ability to absorb deformation energy
increases, with the consequent increase in ductility and durability .
This three-dimensional network inside the bitumen entails reduced mobility and greater viscosity. In short, K-CELL make it possible to obtain bituminous mix with higher bitumen content, more resistant to stripping, to water-caused wear and to mechanical traction and bending stress.

Why use it

K-CELL improve the mechanical characteristics of traditional and modified bituminous mixes in all hot applications referred to in the new
standard UNI EN 13108, increasing their durability .
Thanks to high axial resistance, combined with the elongation capacity and excellent stability in aggressive environments, K-CELL represent a sound solution to fragility and breaking that affect bituminous mixes,
especially in those with a high percentage of air voids. In all studies carried out, the results show an improvement in the mechanical characteristics of the mix, expressed in a higher absolute value of the complex modulus and an overall improvement in the deformation.

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One of the benefits of partnering with us is that you have access to our multi-mill network. Across all our mills, you can expect the same commitment to quality. We produce consistent products with a full range of specifications.

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