CVG 2141 Lecture Notes - Lecture 4: Evaporation, Straight Edge, Fly Ash

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Concrete Mix Design:
Steps:
List Given Information: Type of structure, 28 day f’c, cement SG, CA SG, CA max nom sixe , FA
SG, etc.
Choice of Slump: From Table 9-6. Based on type of structure. Choose the maximum slump
oNear-zero = low w/c
oNormal
oShear = lack of cohesion
oCollapse = high w/c
Maximum Aggregate Size: given or will depend on:
ob/w forms: <1/5
ob/w bars: < ¾ min of clear spacing
oSlab: <1/3 depth
Water/Cement Ratio
oDepends on Exposure class
oFrom table 9.1
oAdjust required f’c, chose the larger value
Required Avg f’c
oUse chart equations, use the larger
oUse table 9.10 for SD if at least 15 samples were used
oIf statistical data is not available use table 9.11
Water Cement Ratio:
oDepends on 28 day compressive strength
May need to interpolate:
Choose Air content Category
oDepends on exposure class
oFrom table 9.1
Water and Air content req.
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