normal concrete

1.  Normal Concrete

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• The concrete in which common ingredients i.e. aggregate, water, cement are used is known as normal concrete. It is also called normal weight concrete or normal strength concrete.
• It has a setting time of 30 - 90 minutes depending upon moisture in atmosphere, fineness of cement etc.
• The development of the strength starts after 7 days the common strength values is 10 MPa (1450 psi) to 40 MPa (5800 psi). At about 28 days 75 - 80% of the total strength is attained.
• Almost at 90 days 95% of the strength is achieved.
  
  

  Properties of Normal Concrete

  • Its slump varies from 1 - 4 inches.
  • Density ranges from 140 pcf to 175 pcf.
  • It is strong in compression and weak in tension.
  • Air content 1 - 2 %.
  • Normal concrete is not durable against severe conditions e.g. freezing and thawing.