brick of tile rubble
Clean, hard broken brick or tile is an excellent material for hardcore. Bricks should be free of plaster. On wet sites the bricks should not contain appreciable amounts of soluble sulphate.
Clean, hard broken brick or tile is an excellent material for hardcore. Bricks should be free of plaster. On wet sites the bricks should not contain appreciable amounts of soluble sulphate.
concrete rubble
Clean, broken, well-graded concrete is another excellent material for hardcore. The concrete should be free from plaster and other building materials.
gravel and crushed hard rock
Clean, well-graded gravel or crushed hard rock are both excellent, but somewhat expensive materials for hardcore.
chalk
Broken chalk is a good material for hardcore providing it is protected from expansion due to frost. Once the site concrete is laid it is unlikely to be affected by frost.
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