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== | == BubbleSifter == | ||
The durability of portland [[cement]] concrete in cold weather climates where freezing and thawing takes place is largely determined by the nature of the air void system in the cement paste matrix that binds the concrete together. | The durability of portland [[cement]] concrete in cold weather climates where freezing and thawing takes place is largely determined by the nature of the air void system in the cement paste matrix that binds the concrete together. |