Hardcore

1. Hardcore is the infill of materials such as crushed and graded bricks , stone or concrete , which are hard and do not readily absorb water or deteriorate
2. Hardcore is spread and levelled over the site within the external walls of the buildings
3. Usually laid in 100-150mm layers to the required depth of 100-300mm.
4. Each layer must be well compacted using a vibrating roller , to prevent any unacceptable settlement below the solid concrete grounf floor

The Functions of hardcore are :

1. To fill in any small packets that have formed during oversite excavations
2. To provide a firm base on which to place a concrete bed
3. To help spread any point loads over a greater area
4. To act against capillary action of moisture within the soil