SMAPOL® – the additive to hot mix asphalt (HMA) is obtained from the processing of textile cords recovered during the recycling process of end-of-life tires (ELT). The fibres from ELT are formed by mechanical crushing and separation from the rubber particles. In the additive production process, a multi-fibre mix consisting of polyester, polyamide and polypropylene fibres is optimised for the fibre content of each type, activated and modified.
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SMAPOL® additive is the most cost-effective way to improve the physico-mechanical properties of HMA among known analogues based on the method of use.
SMAPOL® additive is a non-toxic, water-insoluble cylindrical granules (pellets) with a bulk density of 410.0 to 460.0 kg/m3 in dark gray (black-gray) color. The average length of the granules is from 5 to 25 mm, the thickness (diameter) is 6.0 ± 1.0 mm.
SMAPOL® additive provides stability to delamination, segregation and fluidity of the asphalt binder, as well as dispersed reinforcement the structure of HMA with an increased content of bitumen, such as stone mastic asphalt (SMA), gussasphalt/mastic asphalt (MA) and others. It can also be used as a dispersive reinforcing (arming) additive to other types of HMA, with appropriate technical and economic justification
The dosage of SMAPOL® to HMA with an increased bitumen content, providing the required binder drainage index, is usually from 0.2% to 0.6 % by weight of the mineral components of the mix, i.e. from 2.0 to 6.0 kg per 1 ton, depending on the properties of the bitumen used and the granulometry of HMA.
SMAPOL® in comparison with stabilizing additives based on cellulose fiber provides an optimal degree of bitumen absorption, which allows, with a lower bitumen content, to achieve not only higher strength and deformability indicators, but also higher indicators of water resistance and frost resistance (including corrosion resistance) of improved HMA.
The optimal dosage of SMAPOL® is determined in the process of HMA composition design in accordance with the requirements of applicable standards, regulatory and technical documents. The final correction of bitumen and SMAPOL® additive content within the permissible limits can be made at the stage of test work at the asphalt mixes plant.
The innovative method of SMAPOL® granular additive production allows to take full benefits of the advantages of each type of fiber to stabilize and dispersed reinforcement of HMA in order to increase reliability and durability.
The component composition of SMAPOL® additive and the mechanical properties of the cylindrical granules obtained in the pelleting process under appropriate optimal conditions, ensure that it can be fed into the mixer of the asphalt mixes plant by any of the known methods and evenly mixed during the production of HMA at standard temperature and technical process.
Typically, SMAPOL® additive during HMA production is fed directly from the big-bags into the mixer in an automatic way (via a screw or pneumatic feeder)
SMAPOL® can be used in the construction of road pavements of highways, city streets, airports, driveways, parking lots and squares in all road-climate zones.
Road pavements made of HMA enhanced with the addition of SMAPOL® differ not only in increased structural uniformity, but also increased resistance to ruts, thermal cracking and fatigue.
SMAPOL® – Functional Simplicity…
