Method of manufacturing a bituminous coated aggregate mix
AssigneeHtp Est
InventorsAlain Romier, Yves Martineau, Jacques David, Maurice Audeon
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a bituminous coated aggregate mix, said method comprising at least the following steps: (a) course aggregate are dried by heating; (b) an intermediate mix is formed by coating the course aggregate with hot bitumen; and (c) wet sand is mixed with the intermediate mix obtained in step (b).
Claims25
A method of manufacturing a bituminous coated aggregate mix comprising aggregate coated with bitumen, said aggregate itself comprising fine aggregate and coarse aggregate lying in the range 4 mm to 20 mm, said method comprising at least the following steps:
- (a) drying a first portion of the aggregate that has substantially no fines by heating to a temperature which is not less than 100° C.,
- (b) an intermediate mix is formed by coating said first portion of the aggregate with hot bitumen;
- and
- (c) mixing a second portion of the aggregate that comprises sand and fines that is wet and unheated with the intermediate mix obtained at step (b), thereby obtaining said bituminous coated aggregate mix at a temperature lying in the range 60° C. to 100° C., and whereby at least part of the water contained in the second portion of the aggregate is vaporized during said step (c) and causes the bitumen to expand.
A method of manufacturing a bituminous coated aggregate mix comprising aggregate coated with bitumen, said aggregate itself comprising fine aggregate and coarse aggregate lying in the range 4 mm to 20 mm, said method comprising at least the following steps:
- drying a first portion of the aggregate that has substantially no fines by heating to a temperature which is not less than 100° C.,
- mixing the first portion with a second portion of the aggregate and with hot bitumen, the second portion of the aggregate comprising sand and fines and being wet and unheated, thereby obtaining said bituminous coated aggregate mix at a temperature lying in the range 60° C. to 100° C., and whereby at least part of the water contained in the second portion of the aggregate is vaporized during said mixing and causes the bitumen to expand.
A method of manufacturing a bituminous coated aggregate mix comprising aggregate coated with bitumen, said aggregate itself comprising fine aggregate and coarse aggregate lying in the range 4 mm to 20 mm, said method comprising at least the following steps:
- (a) drying a first portion of the aggregate that has substantially no fines by heating to a temperature which is in the range 180° C. to 220° C. and preferably about 200° C.,
- (b) an intermediate mix is formed by coating said first portion of the aggregate with hot bitumen;
- and
- (c) mixing a second portion of the aggregate that comprises sand and fines that is wet and unheated with the intermediate mix obtained at step (b), thereby obtaining said bituminous coated aggregate mix at a temperature lying in the range 100° C. to 150° C., and preferably about 130° C.
A method of manufacturing a bituminous coated aggregate mix comprising aggregate coated with bitumen, said aggregate itself comprising fine aggregate and coarse aggregate lying in the range 4 mm to 20 mm, said method comprising at least the following steps:
- drying a first portion of the aggregate that has substantially no fines by heating to a temperature which is in the range 180° C. to 220° C. and preferably about 200° C.,
- mixing the first portion with a second portion of the aggregate and with hot bitumen, the second portion of the aggregate comprising sand and fines and being wet and unheated, thereby obtaining said bituminous coated aggregate mix at a temperature lying in the range 100° C. to 150° C., and preferably about 130° C.
A method of manufacturing a bituminous coated aggregate mix comprising aggregate coated with bitumen, said aggregate itself comprising fine aggregate and coarse aggregate lying in the range 4 mm to 20 mm, said method comprising at least the following steps:
- (a) drying a first portion of the aggregate including coarse aggregate by heating to a temperature which is not less than 100° C.,
- (b) an intermediate mix is formed by coating said first portion of the aggregate with hot bitumen;
- and
- (c) mixing a second portion of the aggregate that comprises sand and fines that is wet and unheated with the intermediate mix obtained at step (b), thereby obtaining said bituminous coated aggregate mix at a temperature lying in the range 60° C. to 100° C., and whereby at least part of the water contained in the second portion of the aggregate is vaporized during said step (c) and causes the bitumen to expand.
A method of manufacturing a bituminous coated aggregate mix comprising aggregate coated with bitumen, said aggregate itself comprising fine aggregate and coarse aggregate lying in the range 4 mm to 20 mm, said method comprising at least the following steps:
- drying a first portion of the aggregate including coarse aggregate by heating to a temperature which is not less than 100° C.,
- mixing the first portion with a second portion of the aggregate and with hot bitumen, the second portion of the aggregate comprising sand and fines and being wet and unheated, thereby obtaining said bituminous coated aggregate mix at a temperature lying in the range 60° C. to 100° C., and whereby at least part of the water contained in the second portion of the aggregate is vaporized during said mixing and causes the bitumen to expand.
Dependencies are inferred from the claim text.