Machine mixing and slump of cement concrete

Saturday, March 18, 2017 19:42
Posted in category Civil Engineering Practice
Views: 1,170 views

Machine mixing of cement concrete

Following points must be kept in mind for machine mixing of cement concrete.

  • Stone ballast, sand and cement to be pour into the cement concrete mixer.
  • For example, for concrete of ratio 1:2:4 first four boxes of stone ballast, then two boxes of sand and then one bag of cement should be put into the cement concrete mixer.
  • The machine then revolve to mix dry materials.
  • Then water should be added to the required quantity, 25 to 30 litres (5 to 6) gallons per bag of cement to have the required water cement ratio.
  • The mixing should be proper to have a plastic mix of uniform color.
  • It requires 1.5 to 2 minutes rotation for proper mixing.
  • Mixed concrete shall be unloaded on a masonry platform or on a iron sheet.
  • Output of concrete mixer is 15 to 20 mix per hour.

Slump of cement concrete

  • Slump test is carried out to control the addition of water into the cement concrete.
  • It is carried out to maintain the required consistency.
  • A slump of 7.5 cm to 10 cm (3 inch to 4 inch) is required for building work.
  • For road work it may be 3 to 4 cm (1.5 inch to 2 inch).
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