SSD condition of fine or coarse aggregates means -
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A.
Saturated Surface Densified condition
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B.
Super Saturated Dry condition
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C.
Self Saturating and Densification condition
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D.
Saturated Surface Dry condition
Correct Answer:
D. Saturated Surface Dry condition
Explanation:
Saturated Surface Dry (SSD) refers to the moisture state where an aggregate's internal permeable pores are completely filled with water, but its outer surface is dry and free of visible moisture. This condition is a critical reference point in concrete mix design because SSD aggregates neither absorb water from the cement paste nor contribute excess moisture to the mix, ensuring an accurate water-cement ratio and proper hydration.
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