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AssigneeCanadian Patents and Development Limited
InventorsJames J. Beaudoin, Peter J. Sereda
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A sulfur-bituminous composite binder material consisting essentially of 60-75% by weight sulfur and 25-40% by weight bituminous material. Optionally a small amount of a fibrous or flake reinforcing material and usually a filler material can be added. The binder is suitable for use as a self-compacting road or pothole repair material. A feature of the composite binder is the presence of two continuous phases which is achieved by mixing solid particulate sulfur with a softened bituminous material at a temperature in the range 120.degree.-150.degree. C. or by mixing liquid sulfur with liquid asphalt with a sufficient shearing mixing action to produce an emulsion of the liquid sulfur in the asphalt which, on cooling produces a continuous, rigid, crystaline and porous sulfur skeleton in the composite.
A sulfur-bituminous composite binder material consisting essentially of above 60% and up to 75% by weight sulfur and from 25% to below 40% by weight bituminous material, wherein a rigid microporous continuous skeleton of sulfur is surrounded by a continuous bituminous phase and wherein said bituminous material is selected from asphalt, tar and pitch.
A method for producing a sulfur-bituminous composite binder material wherein said sulfur and said bituminous material are interspersed throughout said composite as two continuous phases which comprises mixing finely divided solid particles of sulfur of about 5 microns with a semi-liquid bituminous material selected from asphalt, tar and pitch at a temperature in the range 120.degree. C.-150.degree. C. in proportions of above 60% and up to 75% by weight sulfur and from 25% to below 40% by weight of said bituminous material, and cooling the resultant composite binder material, thereby producing a microporous continuous crystalline sulfur phase in a continuous viscoelastic bituminous phase.
A method for producing a sulfur bituminous composite binder material wherein said sulfur and said bituminous material are interspersed throughout said composite as two continuous phases, which comprises mixing liquid sulfur with a liquid bituminous material selected from asphalt, tar and pitch, at a temperature in the range 130.degree.-150.degree. C., with sufficient shear action to produce an emulsion of liquid sulfur in said bituminous material in proportion of above 60% and up to 75% by weight sulfur and 25% to below 40% by weight bituminous material, cooling the resultant mixture and thereby producing a microporous continuous crystalline sulfur phase in a continuous viscoelastic bituminous phase.
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