Concrete Mix Design Instruction

CONCRETE MIX DESIGN
10 Essential Things to Remember
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10 Things to remember during Concrete Mix Design
Good quality concrete starts with the quality of materials, cost effective designs is actually a by-product of selecting the best quality material and good construction practices.

10 Things to remember during Concrete Mix Design
Following are 10 Things to remember during Concrete Mix Design and Concrete Trials.

1. Standards for Mix design
ACI and other standards only serves as a guide, initial designs must be confirmed by laboratory trial and plant trial, adjustments on the design shall be done during trial mixes.
Initial design “on paper” is never the final design.

2. Trial Mixes
Always carry out trial mixes using the materials for actual use.

3. Design Variation Tests
Carry out 2 or 3 design variations for every design target.

4. Safety Factors
Consider always the factor of safety, (1.125, 1.2, 1.25, 1.3 X target strength)

5. Material Sources
Before proceeding to plant trials, always confirm the source of materials to be the same as the one used in the laboratory trials.

6. Batching Plant Calibration
Check calibration of batching plant before trials

7. Tests at Batching Plant
Carry out full tests of fresh concrete at the batching plant, specially the air content and yield which is very important in commercial batching plants

8. Quality Control
Correct quality control procedures at the plant will prevent future concrete problems

9. Admixture
Follow admixture recommendations from your supplier

10. Strength Development Check
Check and verify strength development, most critical stage is the 3 and 7 days strength

Important note:
Technical knowledge is an advantage for batching plant staff, even if you have good concrete design but uncommon or wrong procedures are practiced it will eventually result to failures

Further Resources for Concrete Industry
Check out these websites:
http://CivilEngineerLink.com/
http://CivilEngineerSite.com/
http:// CivilEngineerBlog.com /
THE END

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Concrete Mix Design Instruction

by Civil Engineer on Oct 08, 2011

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