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Design the concrete mix according to the following conditions:Design EnvironmentBuilding frameRequired designMinimumMinimum space betweenMinimum cover overStatistical data indicate a standard deviation of compressivestrength of 2.1 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification 6.3 ml/1% air/100 kgcement.Coarse aggregate: 19 mm maximum size, river gravel (rounded)Bulk oven-dry specificOven-dry roddedMoistureFine aggregate: Natural sandcontent = 2.5%density = 1761 kg/m3gravity = 2.55, Absorption = 0.3%rebar = 40 mmrebar = 40 mmdimension = 150 mmstrength = 27.6 MPa
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