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Approach involving stress and strength |
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Approach using stress, flaw, and toughness. |
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solved crack ellipses in 1913 |
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Exhibit substantial deformation |
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Three Toughening Mechanisms |
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1. Increase Toughness
2. Reduce Flaw Size
3. Prestress |
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To make it react faster, as it increases surface area |
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Chemical Reactions when cement combines with water? |
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- 2C3S + 6H --> C3S2H3 + 3CH
- 2C2S + 4H --> C3S2H3 +CH
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How do the equations change if silica fume is added? |
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silica fume reacts with calcium hydroxide |
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more plastic and forgiving mortar |
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- lower water content
- higher slump
- lower cement content
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Primary Property of a Glaze |
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Low coefficient of thermal expansion |
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Provides cohesion and reduces amount of cement |
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by-product of reducing high purity quartz with coal in an electric furnace |
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by-product of iron blast furnace |
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Admixture that disperses flocculated chemical particles through electrostatic repulsion.
Improves workability, decreses water demand |
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Key factor(s) needed for curing |
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- Time
- Temperature
- Moisture
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Provides standard in testing |
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Way(s) to make concrete structure more resilient to steel corrosion |
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- coat with corrosion resistant material
- decrease w/c ratio
- cover depth
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measured to quantify how corrosion affects different types of concretes |
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