In premix method, the aggregate and the binder are premixed prior to placing and spreading the Mix over the pavement structure.
It mens that every individual aggregate particle receives uniform thickness of the binder film before it is placed . In primix mermet in construction increased stability is achieved because aggregate gradation may be carefully selected to given a dense mass possessing minimum voids.
In the case of grouted macadam , the binder has to reach the full or half aggregate layer by penetrating through the open voids between the aggregate particle. That is why In this construction, more quantity of bitumen is required to fill voids which are deliberately left in the pavement structure to enable the bitumenous binder to penetrate to the lowest layers of stones
The premix bituminous wearing surfaces are classified as under
It mens that every individual aggregate particle receives uniform thickness of the binder film before it is placed . In primix mermet in construction increased stability is achieved because aggregate gradation may be carefully selected to given a dense mass possessing minimum voids.
In the case of grouted macadam , the binder has to reach the full or half aggregate layer by penetrating through the open voids between the aggregate particle. That is why In this construction, more quantity of bitumen is required to fill voids which are deliberately left in the pavement structure to enable the bitumenous binder to penetrate to the lowest layers of stones
The premix bituminous wearing surfaces are classified as under
- Bitumen bound macadam
- Bitumen carpet
- Bitumen concrete
- Sheet asphalt
- Mastic asphalt
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