________ are much larger than capillary pores.
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A.
Air voids
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B.
Micro cracks
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C.
Blow holes
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D.
Macro cracks
Correct Answer:
A. Air voids
Explanation:
Air voids are significantly larger than capillary pores in concrete. While capillary pores are formed by the space previously occupied by water in the cement paste and typically range from 0.01 to 10 micrometers, air voids are intentionally entrained or accidentally trapped during mixing and are usually between 50 and 200 micrometers in size. Because they are much larger and not interconnected like capillary pores, air voids help improve the durability of concrete against freeze-thaw cycles without significantly increasing permeability.
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