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Concrete Mix design is a complete science, and it is based on much research. The Popular Mix Design method is highlighted in the ACI 2011 committee report. It is a systematic approach in which a user starts with a defined slump and strength and some other parameters. The result gives the amounts of different constituents needed.
Performance-based methods are also available in which engineers based on their experience, decide initial proportions, and modifies it as needed. Both systematic (theoretically) and performance-based methods have certain advantages and disadvantages, which will be covered in later posts.
Though the mixed design is a comprehensive process, it is still handy for engineers to know specific mix design concrete thumb rules, which will make their life easier. Here is the list
Mix design of concretes gives its constituents, which include coarse aggregate, fine aggregate, cement, and water.
By adding 4 liters of water in 1 cubic meter of concrete mix
- increases the slump by about 25 mm can be expected.
- It will also decrease the compressive strength of about 1.5 to 2.0 N/mm2.
- Increase shrinkage potential by about 10%
- Waste as much as ¼ bag of cement
Effects of increasing concrete mix temperature by 1 degree Celcius
- About 4 liters of water per 1m3 maintains equal slump.
- Air content will decrease by about 1%
- Compressive strength will decrease from about 1.0 to 1.5 N/mm2.
Effect of air content on concrete mix
- If air content increases by 1%, it will result in compressive strength decrease of about 5%
- Assuming that the content of air decreases by 1%, then it will cause the yield strength to decrease by about 0.03 cubic meters per 1 cubic meter of concrete mix.
- On condition that air content decreases by 1%, then the slump will decrease also by about 12.5 mm.
- If the air content decreases by 1%, it will result in durability decreases by about 10%.
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