6505-8 - CONCRETE MIX DESIGN Objective of concrete mix...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Most Important Factor Affecting Workability : Water Content Most Important Factor Affecting Strength : Water- Cement Ratio Most Important Factors Affecting Durability : Water- Cement Ratio and Cement Content Most Important Factor Affecting Appearance : Proportioning of fine and coarse aggregates
Background image of page 2
3 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 Properties of aggregates to be used: Coarse Agg. Fine Agg. 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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 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 is equal to the larger of the following two values:
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/26/2011 for the course CGN 6505 taught by Professor Mang during the Spring '11 term at University of Florida.

Page1 / 18

6505-8 - CONCRETE MIX DESIGN Objective of concrete mix...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online