Which of the following statement is correct ?
1. Angular aggregated results in maximum percentage of voids hence giving less workability
and high strength due to interlocking.
2. Vee- Bee test is based on the percentage flow from which the workability of the concrete is
determined and its value could range from 0 to 150 percent.
Statement 1 is correct: Angular aggregates have a higher percentage of voids (typically
38% to 45%) due to their jagged edges. This increases the surface area, requiring more
water-cement paste for lubrication, which results in less workability. However, the interlocking
nature of their sharp edges gives a superior mechanical bond, leading to higher strength.
Statement 2 is incorrect: The test based on the percentage flow (ranging from 0 to 150
percent) is the Flow Table Test, not the Vee-Bee test. The Vee-Bee test determines
workability by measuring the time (in Vee-Bee seconds) it takes for a concrete mass to
change from a slump cone shape into a cylinder under mechanical vibration.
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