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# Design the concrete mix according to the following conditions: Design Environment  Building frame  Required

design strength 27.6 MPa  Minimum dimension =150 mm  Minimum space between rebar = 40 mm  Minimum cover over rebar =40 mm  Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples).  Only air entrainer is allowed. Available Materials  Air entrainer: Manufacture specification 6.3 ml/1% air/100 kg cement.  Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded) o Bulk oven-dry specific gravity = 2.55, Absorption = 0.3% o Oven-dry rodded density = 1761 kg/m3 o Moisture content = 2.5%  Fine aggregate: Natural sand o Bulk oven-dry specific gravity = 2.659, Absorption = 0.5% o Moisture content = 2% o Fineness modulus = 2.47

FOR BUILDING SLUMP IS 25-100 FOR 19MM AGGREGATE SIZE WATER REQUIRED IS 168KG/CUM FOR STRENGTH OF CONCRETE =27.6 CORRESPONDING... View the full answer

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