CVG 2141 Chapter Notes - Chapter 5: Ice Protection System, De-Ice, Relative Density
20 Jun 2016
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An example of proportioning a concrete mix using admixtures. Specify the mix proportions of a concrete to be used in a bridge deck. A compressive strength f"c of 30 mpa at 28 days is specified. The concrete producer has a standard deviation of 2 mpa for similar mixes to that required here. Air entrainers and plasticizers are to be used. A slump of 200 mm to 250 mm is required. Fly ash is also to be used at a dosage of 15% by mass of cementing materials. For an 8% air content, dosage of 0. 5 g per kg of cementing materials. Dosage of 30 g per kg of cementing materials. This particular admixture is known to reduce the water demand by 15%. Assume that the chemical admixture have a density close to that of water (1 ml of admixture has a mass of 1g): specify slump.
