In case concrete is to be transported by pumping, the slump of the concrete should be-
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A.
More than 1 cm
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B.
Between 5 to 7.5 cm
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C.
More than 2.5 cm
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D.
Between 2.5 to 5 cm
Correct Answer:
B. Between 5 to 7.5 cm
Explanation:
For concrete to be effectively transported by pumping, it must have a medium to high degree of workability to flow smoothly through the pipeline without causing blockages or segregation. According to standard engineering practices, the ideal slump range for pumped concrete is between 5 to 7.5 cm (50 to 75 mm). This range provides the necessary fluidity for the pump to push the mixture while maintaining enough cohesion to keep the aggregates and cement paste together. A slump lower than this range makes the mix too stiff and difficult to pump, while a significantly higher slump can lead to the separation of materials.
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