Set_4.__Proportioning_of_Portland_Cement_Mixtures

Set_4.__Proportioning_of_Portland_Cement_Mixtures - CE 3684...

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CE 3684 Proportioning of R. E. Weyers Portland Cement Mixtures Objective: determine the most economical and practical combination of available materials that will satisfy the PERFORMANCE REQUIREMENTS considering: Workability of the fresh mixed ingredients Strength: account for variability Durability: environment exposure conditions Appearance: uniformity of color and texture Economy: first cost; life-cycle cost
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Procedure *Select W/C, W/C+P (W/CM) Strength: f cr = f c + 1.34S [psi, MPa] f cr = f c + 2.33S - 3.45, MPa = f c + 2.33S - 500, psi f cr = required average strength f c = specified strength S = standard deviation NOTE: X i = individual strength test, a test is an average of two cylinders @ 28 days = average of n strength tests. )] 1 n ( ) X 2 X i [( 2 / 1 S - ÷ - = X
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Durability: Exposure conditions as: wear, freezing and thawing, deicer salts, sulfate exposure, etc. Non-air-entrained/air-entrained Exposures: Mild: indoors or outdoors where there is no exposure to f & t or deicing salts, may use entrained air to improve workability. Moderate: some f & t occurs, but concrete is not exposed to moisture or free water for long periods prior to freezing, no exposure to deicing salts. Severe: f & t of saturated concrete, exposure to deicing salts.
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