2010年7月27日星期二

Hardore 2

The material used for hardcore should be chemically inert , not appreciably affected by water and be free from water-soluble suphates.

Material used for hardcore are :
  • -Brick or tile rubble
  1. Clean , hard broken brick or tile crushed and graded
  2. Bricks should be free or plaster
  • Concrete rubble
  1. Clean , broken , well graded concrete is a good material for hardcore
  2. THe concrete should be free from plaster
  • Gravel and crushed hard rock
  1. Clean , well graded gravel or crushed hard rock are both excellent , but expensive materials for hardcore
  • Chalk
  1. Broken chalk is a good material for hardcore providing it is protected from expansion due to frost
  • Road planings
  1. When roads are resurfaced , the top of the road is planed off
  2. THe planings provide a very good strong hardcore , which binds together when compacted

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