Compositions: coating or plastic – Coating or plastic compositions – Bituminous material or tarry residue
Patent
1988-12-29
1991-07-02
Dixon, Jr., William R.
Compositions: coating or plastic
Coating or plastic compositions
Bituminous material or tarry residue
428378, C08L 9500
Patent
active
050282662
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a granulate comprising fibrous fillers, in particular for introducing the fibrous fillers into bitumen masses, as well as a method for manufacturing the granulate comprising the fibrous fillers. In the following, the term bitumen is to be understood as all bituminous substances, including bitumen and possibly polymer-modified bitumen and/or tar and/or pitch, as well.
The invention relates in addition to a method for manufacturing bitumen masses comprising bitumen stabilized with fibrous fillers.
It is known to add fibrous filler material to bitumen masses in order to influence the flow properties of the bitumen masses such that they do not have such a strong tendency to flow, i.e. the fibrous fillers have a thixotropic effect in the bitumen. This has, for example, the advantage that a bitumen mass can be applied to a vertical wall in the form of a coating mass as a thicker layer and does not run off so quickly. When the bitumen mass is used on a roofing felt cover it is able to withstand the sun's radiation better when it is stabilized with fibrous fillers since the bitumen then has less ability to flow.
A further example for a bitumen mass is an asphalt mixture used in road building. The amount of bitumen contained in this asphalt mixture can be substantially increased when the bitumen mass is stabilized with fibrous fillers, without the mixture separating into its parts during transport or when applied to the road foundation.
In the known methods for manufacturing bitumen masses the fibrous fillers are very often placed in a mixer, possibly with aggregates, before the bitumen is added and preliminarily mixed. The bitumen is added subsequently.
Problems are, however, generally incurred with this method as the fibrous fillers are not uniformly distributed in the bitumen mass. These problems could be eliminated by using very short fibrous fillers but these have the disadvantage that their thixotropic effect is considerably less than that of long fibrous fillers which, for their part however, tend to agglomerate and combine like cotton-wool balls very easily. It is, therefore, only with difficulty that these fibrous fillers, which are preferred because of their strong thixotropic effect, can be worked uniformly into the bitumen masses.
A mixture of sand or very fine stone chippings with bitumen is often required, for example, for repairing road surfaces and top layer surfaces. Fibrous fillers which are, in particular, long and have the tendency to combine like cotton-wool balls, are very difficult to work into such a fine mineral granule using customary mixing machines and so defective mixtures often occur.
A further difficulty is the problem that a large number of bitumen masses have to be manufactured within a very short period, e.g. the mixing process for a bituminous road surface must be completed within mixing times of generally a few seconds. This means that the difficulties encountered when mixing in the long fibrous fillers which tend to agglomerate and combine like cotton-wool balls will be aggravated further and so the fibrous fillers are not distributed sufficiently uniformly in the material to be mixed. They therefore lead to "nesting" and, consequently, to defective mixtures.
The object underlying the invention is therefore to improve a method of the generic type such that the fibrous fillers can be easily and uniformly distributed throughout the bitumen.
This object is accomplished in accordance with the invention in that for manufacture of the bitumen masses the fibrous fillers are introduced into the fluid bitumen by adding a granulate which comprises the fibrous fillers and which dissolves in the fluid bitumen.
This method has the great advantage that, in contrast to the fibrous fillers previously added in a loose or pressed form, the addition of fibrous fillers in granulated form already results in a coarse distribution of the fibrous fillers in the fluid bitumen which is followed by fine distribution by means of the granulate which dissolves in the fluid bitumen. A
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patent: 4613376 (1986-09-01), Nilsson et al.
SU 1154299, "Dialog Abstracts" (7/5/85) Bituminous Compositions Vatazhniko et al.
"Additives For Plastics", vol. 1, Raymond B. Seymour (Ed.), Academic Press, Inc. (New York), pp. 32, 35, 36, 40, 42 and 75 (1982).
Article entitled "Bitumen Und Asphalt" by Dr. Ing. Wilfrid Fuhrmann published in Vierte Neubearbeitete Auflage, 1969, pp. 97-99.
Dixon Jr. William R.
Marcantoni Paul
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