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Terry Collins
Sustainability consultant
Asked a question last year

What is the method used for the proportioning of Aggregate (10mm &20mm) in Concrete?

While preparing a Design Mix for any Grade, if we have aggregated in two sizes like 10 mm & 20 mm or In fact Sometimes, we do use to have 40 mm aggregate as well. Is there Any IS Code Provision for the same, What are the references for Combined Grading of aggregates in Code. And how can we use them while Designing a mix?

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Flenn Hale
Construction Manager

Following points part of the answer to the question :

  • IS 456  and IS 1343 are the code of practice you can use.
  • The method of proportions aggregates for concrete is part design mix process.
  • Size and Grading impacts the design mix greatly.
  • larger the size of aggregate smaller is the cement requirement for a given W/C ratio
  • Compressive strength of the mix tends to increase with decrease in aggregate size.
  • perform gradation tests using sieves. Coarse aggregates should conform to table 2 of IS 383 and Fine aggregate should conform to Zone 1 of IS 383

There is ACI method available for the same exercise ACI 211.1is the code you can use.

 

Hope this helps.