초록 ▼

A low cost method for preparing foamed or aerated asphalt-rubber paving compositions is provided wherein a flowable mixture including respective quantities of asphalt and finally divided reclaimed rubber particles is first directed into a rocket-type reactor along with steam and/or water, thereby su

A low cost method for preparing foamed or aerated asphalt-rubber paving compositions is provided wherein a flowable mixture including respective quantities of asphalt and finally divided reclaimed rubber particles is first directed into a rocket-type reactor along with steam and/or water, thereby subjecting the mixture to conditions of elevated temperature, pressure and shear. Thereafter, the initially reacted mixture is passed into a pressurized, secondary reaction vessel system in order to complete the gelation reaction in a period of, e.g., 7-15 minutes. The preferred apparatus (10) includes a rocket-type primary reactor (12) presenting a confined reaction zone (20); asphalt-rubber and water/steam conduits (42, 48) communicate with the zone (20). The output (24) of the primary reactor (12) feeds directly into a pressurized tank (66) forming a part of the downstream secondary reaction and recovery system (14), where the gelation reaction is completed. The preferred system (14) includes a total of five serially interconnected tanks (66-74) housed within an insulative shell (108) and heated by means of burner (110).

대표청구항 ▼

A method of preparing an asphalt and/or synthetic resin composition comprising the steps of: forming a mixture including at least one of: (1) asphalt and reclaimed rubber particles; (2) asphalt and synthetic resin having a melting point of about 700°F. or less; and (3) synthetic resin having a melti

A method of preparing an asphalt and/or synthetic resin composition comprising the steps of: forming a mixture including at least one of: (1) asphalt and reclaimed rubber particles; (2) asphalt and synthetic resin having a melting point of about 700°F. or less; and (3) synthetic resin having a melting point of 700°F. or less; directing said mixture into a confined reaction zone simultaneously with a quantity of a stream of water and/or steam, and subjecting the mixture in said confined reaction zone to conditions of elevated temperature and shear, and to a pressure of from about 100-800 psi, to agitate and foam the mixture and render it flowable; passing said agitated mixture from said confined reaction zone into a reaction vessel under pressure conditions above atmospheric but below the pressure of said confined reaction zone, and retaining the agitated mixture within said reaction vessel for a time sufficient to assure substantial homogeneity of the mixture; and recovering said homogeneous mixture, said rubber particles having a maximum average size which will pass through an 8-mesh screen.