Q. 1 What is a geotextile?
A. It is a synthetic fabric which is laid on a bitumen tack coat and overlaid with blacktop.
Q. 2 What is a composite?
A. It is a fibreglass grid attached to a geotextile backing fabric.
Q. 3 Will a geotextile stop cracking?
A. Not completely, but if installed correctly it will substantially delay the progress of a crack and will prolong the life of the pavement.
Q. 4 What does the grid do?
A. It reinforces the asphalt and is appropriate where there is movement in the pavement, for example in roads across fenland.
Q. 5 Is the bitumen tack coat important?
A. Yes it is a vital ingredient for absorbing stresses and controlling the spread of cracks.
Q. 6 Does the softening point of the fabric need to be higher than 165°C?
A. No. In experiments the temperature of the fabric during surfacing has never approached this temperature.
Q. 7 Is a second tack coat needed?
A. No. The heat of the mix overlaying the geotextile will soften the bitumen sufficiently to draw it through the fabric to form a bond with the overlay.