25 to 50 mm
25 to 75 mm
75 to 125 mm
50 to 100 mm
Answer is Right!
Answer is Wrong!
The correct answer is: A. 25 to 50 mm
The slump is a measure of the consistency of concrete. It is determined by how much the concrete slumps when it is placed in a cone and then released. A slump of 25 to 50 mm is recommended for columns because it provides a good balance of workability and strength.
A slump of less than 25 mm would make the concrete difficult to place and compact, while a slump of more than 50 mm would make the concrete more likely to crack.
Here is a brief explanation of each option:
- Option A: 25 to 50 mm. This is the recommended slump for columns. It provides a good balance of workability and strength.
- Option B: 25 to 75 mm. This is a higher slump than is recommended for columns. It would make the concrete more difficult to place and compact, and it would be more likely to crack.
- Option C: 75 to 125 mm. This is an even higher slump than option B. It would make the concrete very difficult to place and compact, and it would be very likely to crack.
- Option D: 50 to 100 mm. This is a range that includes both the recommended slump (25 to 50 mm) and a higher slump (75 to 125 mm). It is not clear which slump would be appropriate for columns, so it is not the best answer.