Civil Engineering - Concrete Technology - Discussion

@Sanam.

Please explain it clearly.

The answer should be B. Because coarser aggregate have less surface area and required less mixing water for same degree of workability.

When the surface area is least, it will obviously require least amount of water.

So, from my opinion, option B is correct.

The grading of aggregates in concrete affects the water requirement for a given workability. The water requirement is directly proportional to the surface area of the aggregates. The finer the aggregates, the greater the surface area, and the higher the water requirement to achieve the desired workability.

Therefore, the grading requiring the least amount of water is the one that gives the least surface area for the given amount of cement and aggregates.

Yes, the right answer is B because the least surface area requires the least water EG rounded aggregate has the least surface area compared to others and requiring the least water for that.

The given answer, "greatest surface area for the given cement and aggregates", is correct.