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

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9 Aug 2016

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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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