6505-as5-s09 - compressive strength of this type of...

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CGN 6505 CONCRETE MIX DESIGN PROBLEM SPRING 2009 Due 3/27/09 A concrete mix for concrete slab on ground is to be designed according to the ACI Absolute Volume Method. The slab is to be exposed to severe freeze-thaw climate, with no deicer or sulfate in the environment. An air-entrained concrete is to be used. The specified 28-day compressive strength (f’ c ) is 3,500 psi. Past data show that the standard of deviation of the
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Unformatted text preview: compressive strength of this type of concrete is 420 psi. The specified slump of the fresh concrete is 3 to 4 inches. The cement used will be a Type I cement. Assume the following properties for the aggregates: Coarse Agg. Fine Agg. Dry Bulk Specific Gravity 2.52 2.60 Absorption 0.5% 0.3% Natural Moisture Content 1.5% 0.2% Dry-Rodded Unit Weight 99 pcf - Nominal Maximum Aggregate Size 3/4 inch - Fineness Modulus - 2.4...
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