Cold Recycling of Asphalt Concrete

Recycling of asphalt pavement is of immediate interest today since it makes it possible to save existing resources.  Additionally, the problem of the proper disposal of old asphalt requires a reasonable solution.  Recycling therefore, provides a certain beneficial economic effect.

In today’s modern environment, there are several approaches to old asphalt recycling which gives a design engineer a broad selection of choices under current conditions.  Generally speaking, the regeneration technologies may be divided into ones that are and ones that are cold.  The advantages of hot technologies include the possibility to produce material, the application of which is analogous to usual hot mixtures.

There are however, more disadvantages such as:

(1) a need of special equipment; (2) energy, required for drying and warming up of the components; (3) pollution of the environment; (4) limited transportation distance for a given hot mixture; (5) harmful work environment; (6) aging and polymerization bitumen, influenced by a long term exposure to high temperatures; and (7) a need to add special substances to plasticize the bitumen as a part of the old asphalt.

In terms of the environmental preservation and energy saving, cold technologies of asphalt regeneration are more preferable.  Cold regeneration is realized by using bitumen, cement, and bitumen emulsion.

Though the recycling technologies have a wide range of undeniable advantages (no costs for old asphalt transportation, its fullest use), they are characterized by certain disadvantages.  One such disadvantages is a need to apply special machines (recyclers and suspenzators).  Some cases require special bitumen emulsion to better encapsulate the particles of old asphalt.  This emulsion is produced in the bitumen-emulsion units, designatedby GlobeCore as the UVB-1 line of bitumen equipment.  The main part of this equipment is a colloid mill.

It is a colloid mill that grinds down bitumen particles and provides for even distribution in a water phase.  It favours the production of high stable emulsions that do not break down over a long period of time.

There is also a well known technology that provides for the regeneration of asphalt with dispersed bitumen.  It does not require special equipment and there is no need to produce bitumen emulsion.  The main task is to grind down bitumen to the size required by the technology which may be performed by GloeCore colloid mill type KLM.  It operates according to a “wet” grinding principle that is realized by the difference between the width of the gap at the outlet and at the inlet of the mill.  The surface of the rotor has additional micropatterns that create increased turbulence.  It efficiently tears apart the particles of the product processed.

Practical experience has shown that cold regenerated mixtures can also used for r

обновлено: October 2, 2015 автором: dannik