For a constant aggregate cement ratio, if the coarse aggregate is increased at the expense of sand,
maintaining total aggregate cement ratio constant, then the total surface area of the aggregate is -
-
A.
Reduced
-
B.
Depends on Other factor
-
C.
Remains Unchanged
-
D.
Increased
Correct Answer:
A. Reduced
Explanation:
When the coarse aggregate in a concrete mix is increased while reducing the sand content to keep the total aggregate-to-cement ratio constant, the total surface area of the aggregate decreases. This occurs because coarse aggregate particles have a much smaller surface area per unit of volume compared to fine sand particles. Consequently, replacing smaller particles with larger ones results in a lower overall surface area that needs to be coated by the cement paste.
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