SU687161A1 - Method of regeneration of asphalt-concrete - Google Patents

Description

one

The invention relates to road and airfield construction, in particular, to pei-generation of asphalt concrete, removed from road and airfield coatings, and its reconstruction and overhaul.

There is a method of regeneration of old asphalt concrete, including heating in a drum furnace lumpy material, its movement along the furnace and gravitational mixing with the introduction of a treadmill component.

There is also known a method of regenerating asphalt concrete, which includes heating the kiln material in a furnace and recuperating it with simultaneous drying and heating of inert aggregates, dispensing components and forcibly mixing them 2.

The disadvantage of these methods is that the displacement of the asphalt concrete to be regenerated with the added components is carried out in an arbitrary ratio, as a result of which there is an uneven distribution of the components in the prepared mixture, which leads to uneven surface strength of the coatings.

The purpose of the invented1 is the new quality of asphalt concrete.

This is achieved using the asphalt concrete regeneration method. included:) Warming up lumpy asphalt concrete, drying and heating inert aggregates, dispensing components and forcing them to obtain a homogeneous mass, in which, unlike asphalt concrete after heating, it is continuously determined by its electronic system, using its signals dosing of components.

The technology of the proposed method is as follows.

Pieces of old asphalt concrete are loaded into a heat recovery furnace, in which they turn into viscous mass. The mass is then passed through a scintillation collimator counter and a neutron bitumen meter to determine its composition. The obtained data on the composition of the old asphalt concrete is fed to the software control unit, where they are compared with a given recipe. The calculation results are received in the form of executive drives to the dispensers, according to which the necessary quantity of additional components — crushed stone, sand, plasticizer and bitumen — is weighed. Additional inert seals are heated in parallel in a tumble dryer. After dosing, the heated asphalt concrete and additional components are fed into the mixer puller.

Example. It is required to obtain a regenerated asphalt concrete mixture of a given composition for laying in the top layers of the coating. Dough weight 1000 kg. The pieces of the old asphalt concrete are subjected to heat treatment in a heat exchanger, after which the composition of the old asphalt concrete is determined with the help of the sci-cyan-collimator counter and the neutron meter. The results of the determination and the specified composition are given in the table.

Components

Crushed stone with a size of 5-15 mm

Crushed stone smaller than 5 mm Bitumen

According to the table, in the old asphalt concrete there is an excess of bitumen. Compared with the given composition, m. In this case, after the heated asphalt concrete is delivered with the amount of bitumen 60 kg, i.e. the same composition, also determines the amount of inert aggregates. In this case, the amount of heated asphalt concrete is: 857 kg of crushed stone with a particle size of 5-15 mm - 86 kg, crushed stone is smaller than 5. mm-57 kg and plasticizer at the rate of 1.5% of the amount of bitumen - 0.9 kg This amount of components and old asphalt concrete after its heating in the form of a batch is fed into the mixer for final preparation.

The proposed method is by re-using the old asphalt concrete, by regenerating it, reduces the cost of funds by 20-40% compared with

by known methods and provides high quality.

Claims (2)

1. USSR author's certificate 5 jYo .94328, cl. E 01 C 19/08, 1951. 2. USSR author's certificate number 285583, cl. E 01 C 19/08, 1970.