GATE CE 2015 Set 1 — Question 14

MCQ+1 / -0.33EasyWorkability of ConcreteConstruction MaterialsStructural Engineering

Structural Engineering → Construction Materials → Workability of Concrete

Last updated 5 September 2026

Question

Workability of concrete can be measured using slump, compaction factor and Vebe time. Consider the following statements for workability of concrete: (i) As the slump increases, the Vebe time increases (ii) As the slump increases, the compaction factor increases Which of the following is TRUE?

Correct answer (D) (i) is False and (ii) is True Solution Workability is a measure of the ease with which concrete can be mixed, placed, and compacted. 1. Slump Test : A direct measure of workability. Higher slump means higher workability. 2. Compaction Factor Test : Another direct measure. Higher compaction factor means higher workability. 3. Vebe Consistometer Test : Measures the time required for concrete to be compacted. Higher Vebe time indicates a stiffer mix and thus lower workability. Evaluating the statements: Statement (i) : As slump increases (workability increases), the concrete becomes more fluid, so the Vebe time should decrease. Thus, (i) is False. Statement (ii) : As slump increases (workability increases), the compaction factor also increases as both are direct indicators of workability. Thus, (ii) is True. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (D) (i) is False and (ii) is True Solution Workability is a measure of the ease with which concrete can be mixed, placed, and compacted. 1. Slump Test : A direct measure of workability. Higher slump means higher workability. 2. Compaction Factor Test : Another direct measure. Higher compaction factor means higher workability. 3. Vebe Consistometer Test : Measures the time required for concrete to be compacted. Higher Vebe time indicates a stiffer mix and thus lower workability. Evaluating the statements: Statement (i) : As slump increases (workability increases), the concrete becomes more fluid, so the Vebe time should decrease. Thus, (i) is False. Statement (ii) : As slump increases (workability increases), the compaction factor also increases as both are direct indicators of workability. Thus, (ii) is True.

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