Set_2.__Concrete_Aggregate

Set_2.__Concrete_Aggregate - Concrete Aggregate Aggregate...

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Concrete Aggregate Aggregate Normal weight: limestone, dolomite, granite, basalt, diabase, quartzite Light weight: expanded shale, expanded clay, slate, pumice, expanded vermiculite Concrete Strength: limited by the strength of the aggregate Concrete Unit Weight: Normal weight: 140 to 150 lbs/cf Light weight structural: 115 to 125 lbs/cf Light weight acoustical: 60 to 80 lbs/cf
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Concrete Aggregate Fine : less than the #4 sieve (5 mm) Gradation: Sieve - Not more than 45% passing any sieve and retained on the next consecutive sieve - FM, no less than 2.3 , not more than 3.15 - FM not to vary by more than 0.20 from the base FM Size 3/8 #4 #8 #16 #30 #50 #100 % Passing 100 95 to 100 80 to 100 50 to 85 25 to 60 10 to 30 2 to 10 100 tained Re % Cumulative FM Modulus Fineness = % Retained = 100 minus % Passing 38 . 3 100 98 90 75 50 20 5 0 : Examples = + + + + + + 15 . 2 100 90 70 40 15 0 0 = + + + + +
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Concrete Aggregate Influence of FM Smaller FM, Finer Aggregate, Higher Water Demand • For the same cement content and workability: increase w/c ratio, reduces strength and durability and increases shrinkage
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