cold_weather - Cold and Hot Weather Concreting CE 165:...

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CE 165: Concrete Materials and Concrete Construction CE 165: Concrete Materials and Concrete Construction Cold and Hot Weather Concreting Cold and Hot Weather Concreting
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CE 165: Concrete Materials and Concrete Construction CE 165: Concrete Materials and Concrete Construction Concreting in Cold Weath Concreting in Cold Weath Problems: • Aggregate, cement, and water will be at cold temperature • Low temperature --> slow hydration • Influences setting, hardening, strength development
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CE 165: Concrete Materials and Concrete Construction CE 165: Concrete Materials and Concrete Construction Time of Set Time of Set 73 F 40 F 2 4 6 Initial Final Time (h) P e n t r a i o R s c
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CE 165: Concrete Materials and Concrete Construction CE 165: Concrete Materials and Concrete Construction Strength Strength Time (h) 73 F 50 F 20 F S t re n g h (p s i) 1000
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CE 165: Concrete Materials and Concrete Construction CE 165: Concrete Materials and Concrete Construction Precautions/Solutions Precautions/Solutions 1) Materials and Proportions (indirect way) • Set Accelerators • Type III cement • Use more cement (more heat generation) 2) Mix Temperature • Heat aggregates • Replace some of the mixing water with hot water
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CE 165: Concrete Materials and Concrete Construction Common Practice Common Practice • Insulating formwork (keep heat
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This document was uploaded on 09/17/2011.

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cold_weather - Cold and Hot Weather Concreting CE 165:...

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