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Concrete Mixture Proportioning
  Mix design of concrete is simply the calculation of the mass of its main components (cement, aggregate and water) in order to achieve desired workability and strength. Nowadays, chemical admixtures and minerals (pozzolans) have also become an essential part of a good concrete mix. ACI 211.1 provides a procedure for the basic mixture proportioning of concrete. The amount of admixtures and additives can then be calculated according to the manufacture's specifications.
You can download the free ACI-CMD software programmed by Mahdi Samadzad that follows the ACI method for obtaining the mix design of normal strength concrete. The estimation from this software the same as any mixture proportion should be evaluated in terms of strength and workability. Necessary adjustments can then be applied.

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