The New Paraho Corporation

Larry A Lukens

A shale oil modifier is made of a crude shale oil dehydrogenated sufficiently to attain a viscosity of between about 1200-1800 poise at 60.degree. C. The crude shale oil has sufficient basic nitrogen content so that the dehydrogenated crude shale oil exhibits non-Newtonian properties when mixed with asphalt cements. Preferably, the basic nitrogen content is about 2%-2.5% by weight. The shale oil modifier is made by a process which includes providing a crude shale oil and subjecting the crude shale oil to a two stage distillation followed by a vacuum distillation and collecting the residual fraction. The residual fraction is dehydrogenated with air until a select viscosity, preferably between about 1200-1800 poise at 60.degree. C. is obtained.

Method of making a shale oil modifier

A method for rejuvenating asphalt pavement includes milling and collecting a select thickness of asphalt pavement of a portion of an existing roadbed. A shale oil modified asphalt comprising between 5-25% shale oil modifier and 75-95% asphalt cement is provided. An aggregate comprising about 60-70% virgin aggregate and about 30-40% of the milled and collected asphalt is combined with the shale oil modified asphalt and then applied to a roadbed.

Method for recycling and rejuvenating asphalt pavement

A composition for rejuvenating asphalt comprises between 5-25% by weight shale oil modifier and between 75-95% by weight asphalt cement. The asphalt cement may consist of an AC-10 binder or an AC-20 binder. The shale oil modifier is made of dehydrogenated crude shale oil, the shale oil modifier exhibiting non-Newtonian properties when mixed with asphalt cements. A recycled asphalt pavement consists of the above-described rejuvenating composition and an aggregate composition comprising between about 30-40% recycled asphalt pavement and between about 60-70% virgin aggregate. A method for rejuvenating asphalt pavement includes milling and collecting a select thickness of asphalt pavement of a portion of an existing roadbed. A shale oil modified asphalt comprising between about 5-25% shale oil modifier and 75-95% asphalt cement is provided. An aggregate comprising about 60-70% virgin aggregate and about 30-40% of the milled and collected asphalt is combined with the shale oil modified asphalt and then applied to the portion of the existing roadbed.

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Highlands Ranch, CO, United States of America

Larry A Lukens