Sunday, July 4, 2010

Cleanliness of clay silt and dust

-Present in gravel and sand depost as surface coating
-Large quantity may reduce strength of concrete due to weak bonding

  • Salt contamination
  1. Sand from seashore
  2. Can be removed by washing
  3. If high level , salt may cause efflorescence in concrete and corrosion of steel reinfrocement
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