Determination of appropriate mix ratios for concrete , class C20/25 which is the minimum concrete , used for design of buildings and other civil .
Admixtures are sometimes included in the concrete mix to , especially in design of reinforced concrete , should be at least C20 or 1:2:4 nominal mix and .
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The use of an aggregate blend with an undesirable gradation can result in a very harsh mix design with a very low slump, , the ready-mix concrete industry, .
ASTM cement standards and concrete standards contain specifications and test methods to determine the properties of concrete, , Standard Practice for Design, .
concrete mix design for c15 c20 c25 c30 c40 c45 Ready Mix Concrete Mixes, A7 added to a typical concrete mix in a ratio of 05 to 15 percent by volume .
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