DE256573C - - Google Patents

Description

IMPERIAL

PATENT OFFICE

The endeavor to build more permanent roads than since then is primarily motivated by the automobile traffic, which an extraordinary wear and tear of the road to Consequence has, in the second place, especially in cities and their vicinity, through the very increased Heavy goods traffic.

Since it is not possible for financial reasons, entire country roads and the like with pavement ίο to produce stones or asphalt etc. in a correspondingly permanent condition and The endeavor was to preserve the existing one by building macadam roads Eliminate evil. The construction of the tar macadam roads in particular is based on principle to mix stones, crushed stone, gravel, limestone and the like with a binder and apply this mixture and roll in. Through this procedure the purpose was ao to produce roads that meet today's requirements. would correspond to durability, not achieved, because the substances which act as binders serve and can only come into question, consist essentially of as coal tar or coal tar pitch and similar products, which cannot be distributed in a sufficiently finely divided manner by purely mechanical means Condition with the material required for road construction, such as stones, gravel

and the like, can be mixed. The mingling only happened in such a way that the previously dry or artificially dried gravel material by mere mechanical Process with the previously heated binding agent, such as coal tar, pitch and the like, was mixed and accordingly more of the binder was used than was useful at all to get a solid ceiling. Therefore, especially when the weather is warm, at the points where the binding agent is in excessive amounts were present, nests or accumulations of the binder, ■ which Cause destruction of the road surface because these binders are particularly involved Summer temperatures are far too soft to even withstand normal stress, much less, however, of the extraordinary stress that automobile traffic entails brings to be able to withstand.

It follows from this that the products obtained by mere mechanical augmentation cannot meet today's requirements.

The following describes a process that meets the requirements corresponds in every respect, avoids the aforementioned defects and makes it permissible

makes, regardless of the weather, whether the ballast material used is wet or dry, with the binding agent used, the gravel-S in a uniform manner to encase material.

One proceeds in such a way that one uses the material customary in the area for paving roads, be it crushed stone, gravel, limestone or the like, in contact with the binders in this way

ίο brings that these binders, coal tar, Pitch aUer kind, resin, asphalt products as well as Goudron and the like, through this known suitable agents, emulsified with the emulsion prepared, the aforementioned Gravel or the other material treated and then immediately by appropriate Agents, for example acids, cancels the emulsion again, so the binder again makes free. As a result, every single one

ao particles of the paving material with a uniform thin skin of the binder envelops, as it is by a purely mechanical Process can never be achieved. The addition of excess binder and the uneven distribution of the latter can make this way in downright ideal Way to be met.

According to an already known method, the production of road construction material made of mineral fillers and bituminous binders brought into solution or emulsion happen. So the emulsion as such is rolled in with the road construction material, which has serious disadvantages. The emulsion does not remain evenly distributed in the material, rather pulls itself down and is eventually penetrated by penetrating ' Moisture (rain) was completely washed away. Is the emulsion using ammonia and water ser produced, it is probably made in dry weather (but also only in dry weather) canceled by evaporation of the ammonia and water, leaving the binder behind, but some time passes over this.

during which the emulsion pulls down; also is the deposited binder greasy and greasy and has little binding power. Ammonia is for manufacturing the emulsion is unsuitable for the purpose in question here. According to a Modification of this procedure is to remove the emulsion before rolling in the Road building material done by leaving the mixture to itself, with it the water evaporates. This modification also has the same disadvantages; even at in dry weather it takes some time for the water to evaporate, during which the in the material distributed emulsion is partially drawn down, so that an uneven Distribution of the binder in the crushed stone, etc. takes place. In wet, damp weather, on the other hand, the emulsion is made from the Material washed out before it is removed by evaporation of the water.

In contrast, according to the present method, the emulsion becomes immediately after impregnation of the road construction material lifted; then all the particles of the latter are whole ' evenly coated with a thin skin of the binding agent. A washing away of the Binding agent is impossible, and the process depends on the weather conditions independent.

According to an equally known method for the production of a powdery bituminous Road construction material for stamping work dry powdered stone material under heating with milk of lime to an alkaline one Stone sludge can be processed, to which bitumen is added in the heat, creating an emulsion-like combination of the Bitumen is to enter with the mud; also can the dry stone material initially resin glue solution and further milk of lime are added (creating insoluble calcium resinate arises), whereupon hot liquid bitumen is added, which the lime resinate and envelops the stone particles. The product is poured hot into molds that have cooled down The mass is broken down into briquettes, and the latter are finally ground again. This awkward and, because the individual operations are carried out in the heat, they are not without danger Procedure differs significantly from the present procedure. Apart from that the content of the mass of water is only slight - otherwise it could not solidify into a solid stone by simply cooling it down - So that from the presence of an emulsion in the sense of the present process Can not be spoken of, remains even if the bitumen is really made emulsifiable is, this emulsifying agent is obtained in any case in bulk, so that a Removal of the emulsion in the context of the present process does not take place at all. It goes without saying that when mixing a mixture of powdery Stone material, lime or lime resinate and alkali, and a little water with hot tar such an even distribution of the latter can not even come close to the present method, according to which the stone material with an aqueous emulsion of tar of any desired dilution treated and then by breaking up the emulsion of the tar in a finer uniform Layer is excreted on each particle of the stone material. ■ · iao

Claims (1)

Patent claim: Method for paving streets, roads, squares, footpaths and the like Treating the paving material, such as granite, limestone, crushed stone and the like, with emulsions suitable binders such as tar, tar oil, pitch, resins, asphalt, goudron and the like, in such a way that the binders after the mixing process as such from the Emulsions are freed again, characterized in that the binders be eliminated from their emulsions by the addition of chemical agents.