ColdWeat

ColdWeat - Cold-Weather Concreting Cold Weather s s...

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Cold-Weather Concreting
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Cold-Weather Concreting Cold Weather Average daily temperature <5ºC (40ºF) for 3 successive days Stays <10ºC (50ºF) for more than ½ of any 24h period
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Cold-Weather Concreting Effect of Freezing Fresh Concrete Up to 50% reduction of ultimate strength can occur if frozen — Within a few hours Before reaching a strength of 3.5 MPa (500 psi) Frozen only once at an early age — With curing nearly all strength can be restored Less resistance to weathering More permeable
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Cold-Weather Concreting Relationship Between Initial Set and Casting Temperature
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Cold-Weather Concreting Relationship Between Final Set and Casting Temperature
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Cold-Weather Concreting Relationship Between Slump and Casting Temperature
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Cold-Weather Concreting Effect of Temperature on Strength Development
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Cold-Weather Concreting Effect of Low Temperatures on Strength
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Cold-Weather Concreting Early-Age Strength
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Cold-Weather Concreting Retaining Heat of Hydration
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Cold-Weather Concreting Cold-Weather Concreting Type III or HE high-early- strength cement Additional portland cement (60 to 120 kg/m 3 or 100 to 200 lb/yd 3 ) Chemical accelerators Methods to accelerate strength gain:
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Cold-Weather Concreting
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Cold-Weather Concreting Durability of Non- Air-Entrained Concrete
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Cold-Weather Concreting
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This note was uploaded on 12/15/2011 for the course CM 217 taught by Professor Rogers,m during the Fall '08 term at BYU.

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ColdWeat - Cold-Weather Concreting Cold Weather s s...

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