Recomended Mix Proportions

Note1: Use the same size container for measuring all the materials in a batch - see volume proportions above.

Note 2: The mix proportion suggested using 1:1:2 will be dependant on the quality of the coarse and fine aggregate used.

A few tips on building:

• Use clean aggregates without dust, clay or other impurities.
  
• Store aggregates and sand on a clean hard surface to avoid mud/dirt
  
• Water fit for drinking is adequate for mixing. Surfaces of formwork/ shuttering that will be in contact with concrete should be well oiled prior to placing.
  
• Testing of concrete constituents and reinforcement should be done before delivery. Trial mixes should also be done and approved.
  
• Proper and controlled batching is important to avoid segregation during transfer.
  
• Concrete should not be dropped from over 1m height to prevent segregation of the mix and bubbles formation.
  
• Concrete should be well compacted to remove air bubbles and cavities.
  
• Concrete should be cured i.e. kept in a continuously moist condition for several days.
  
• Concrete or plaster should be well-cured (kept wet) 3-4 times a day for at least 7 days to prevent cracking. Spray gently or protect with plastic sheets (or wet sacks) to prevent rapid drying.
  
• Correct curing increases impermeability, durability and decreases shrinkage
  Reinforcement
  
• Should be stacked off the ground to avoid dirt/mud
  
• Should be kept free from mud, oil, paint and loose rust
  
• During fixing they should be fixed in position with soft wire.
  
• Ends to be cut off or bent inwards to prevent staining. Provide adequate cover.
  

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