alleryStart learning →Per §5.4.1, in the slump test the tamping rod diameter used to compact each layer is:
A16 mm diameter
B12 mm diameter
C10 mm diameter
D20 mm diameter
Answer & Solution
Correct answer: A. 16 mm diameter
1. §5.4.1: 'Each layer is tamped 25 times by the 16 mm diameter tamping rod uniformly.'
2. Both the layer count (4) and the strokes-per-layer (25) are the canonical values reproduced in IS code.
_Source: IGNOU ET-522 Block-2 Unit-5 Workability & Fresh Concrete-I, §5.4.1, p. 8_
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