3501-9 - CONCRETE MIX DESIGN Objective of concrete mix...

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1 CONCRETE MIX DESIGN Objective of concrete mix design : To determine the most economical and practical combination of available materials (i.e. aggregates, cements, water, admixtures, etc.) to produce a concrete that will satisfy the performance requirements. Design Considerations: • Acceptable workability of fresh concrete. • Adequate durability and strength of hardened concrete. • Uniform appearance of hardened concrete. • Economy.
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2 Most Important Factor Affecting Workability : _____ ___________ Most Important Factor Affecting Strength : _______ ____________ Most Important Factors Affecting Durability : ______ __________________________ Most Important Factor Affecting Appearance : __________________________________ ABSOLUTE VOLUME METHOD EXAMPLE 1 Design Criteria: Structure: Foundation Exposure: Below ground, mild climate, no sulfates Specified compressive strength, f’ c : 3,000 psi @ 28 days Data not available to establish the standard deviation of compressive strength. Slump of fresh concrete: 3 - 4 inches
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3 Properties of aggregates to be used: Coarse Agg. Fine Agg. Dry bulk spec. gravity 2.68 2.64 Absorption 0.5% 0.7% Natural moisture 2% 6% Dry-rodded unit wt. 100 pcf - Nom. max. Size of agg. 1.5 inches - Fineness modulus - 2.8 Cement Used: Type I, non-air-entraining Design Procedures (1) Determine Required Average Compressive Strength When the standard deviation of the compressive strength is known, the required average compressive strength, f’ cr
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This note was uploaded on 05/26/2011 for the course CGN 3501 taught by Professor Mang during the Fall '10 term at University of Florida.

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3501-9 - CONCRETE MIX DESIGN Objective of concrete mix...

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