ANTI-ICE PROPERTY

  • THE PROBLEM


    The discomfort suffered by the populations because of the heavy snowfalls can be similar or even worse in case of heavy frost, because, besides the stop of the circulation, there are frequently accidents caused by slipping on frozen roads. Such accidents do not only involve transport vehicles, but also pedestrians moving on pavements and asphalted pedestrian areas.
  • THE SOLUTION


    With the anti-ice / anti-snow asphalt (mix) programme it is possible to eliminate the risks of heavy frost and contribute to increasing the level of national safety.

    With this asphalt (mix) treated with anti-ice programme you obtain the best results acting on two points:

    • the paving thickness with the asphalt (mix) containing the anti-ice programme
    • the stay time in a tank of the bitumen (asphalt) containing the specific programme
  • PAVING THICKNESS


    The higher the thickness of the paving with the asphalt (mix) conditioned by means of the anti-ice programme, the better will be the results.

    This can also be seen from the following table:

    Thickness of laid asphalt (mix) with programme Freezing point of water on the asphalt (mix) treated with programme
    5 cm. carpet -4 °C < Estimated point < -3 °C
    8 cm. binder -7 °C < Estimated point < -4 °C
    12 cm. Tout-Venant -8 °C < Estimated point < -5 °C
    12 cm. Tout-Venant + 8 cm. binder + 5 cm. carpet
    Laid one shortly after the other
    -16 °C < Estimated point < -12 °C

    On alpine passes or in places of particular strategic importance, it is recommended to lay multiple types of asphalt (mix) with anti-snow / anti-ice asphalt (mix) programme as far as a total thickness of at least 35 cm. is reached.

    In regard to the paving thickness, you obtain 2 advantages:

    • a shift downwards of the water freezing point on the asphalt (mix) surface
    • water does not freeze in the upper space, hat is the one beyond the surface, for a distance similar to the paving thickness for the first years and higher afterwards

    Hence the natural consequence of ice melting or thicknesses proportioned to the asphalt (mix) thickness.

    The same situation also repeats for the part under the paving, that is the ground under the anti-ice asphalt (mix). Therefore, under the paving treated with anti-ice programme, we will have a ground with antifreezing features for a thickness that, at first, will be equal to that of the laid anti-ice asphalt (mix), then will increase over the time until being twice higher than that of the paving.

    This condition makes breaking the anti-ice asphalt (mix) difficult, if not even impossible..

    Asphalt (mix) treated with the anti-ice programme is not subject to breaking, since it has a feature that does not allow a freezing of the water that may get inside it. Besides, it tends not to crystallize even at low temperatures, that is it keeps an elastic feature. On the other hand, in comparison to ordinary asphalt (mix), it is more resistant on the softening point, that is it better resists to the heat without getting deformed.

    Under normal conditions, if the ground under the asphalt (mix) is impregnated with water and the temperatures reach the freezing point for several consecutive days (that also happens in damp flat areas), the consequent swelling would finally bring about upward thrusts and the asphalt (mix) would end up by giving in, with the classical breakings you find in ordinary linear cracks, that then have to be repaired through infiltrations of liquid bitumen (asphalt).

    In case of pavings made with asphalt (mix) treated with the anti-ice programme, these types of problems are reduced, if not eliminated.

    In case a layer freezes below the part of the ground made antifreeze, with consequent swelling and upward thrusts, the layer of ground under the asphalt (mix), that is made antifreeze, acts as an absorbing pad for any thrust below, carrying out the function of "absorber".
  • STAY TIME


    The minimum rest time in a tank of the bitumen (asphalt) with the programme for anti-snow / anti-ice asphalt (mix) is fifteen days. With a shorter time, you risk endangering the result given.

    If the time is longer, you will obtain better quality results. ust to give you an example, if the rest lasts the whole winter or even more, that is for a time of at least seven months, all features will be highlighted afterwards in the anti-snow asphalt (mix) for better effectiveness.

    With a seven-month rest, you may notice features that do not even show in treatments with limited times. For example, one of such features is that, in case of equal results in regard to the fifteen-day treatment, you can use a considerably reduced percentage of bitumen (asphalt) in the mixture with inert materials, with economic savings that widely compensate the storage and capital stopping costs.

    If you use the same percentages of bitumen (asphalt) when making concrete, you will notice a performance that is probably considered unthinkable as a rule.

    You gather that you will obtain the best possible result with pavings carried out with the programme for anti-ice asphalt (mix), when you lay the highest asphalt (mix) thickness possible using bitumen (asphalt) treated with the programme for anti-ice asphalt (mix) that must have stayed in a tank as long as possible, before making concrete.