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In the split-cylinder test, why is a 3 mm thick plywood packing strip introduced between the platen and the cylindrical specimen?
Answer & Solution
Correct answer: D.
1. Without a strip, a line load creates infinite vertical compressive stress at the top and bottom.
2. That stress concentration would cause vertical crushing at the contact, not splitting.
3. A 3 mm plywood strip of width about D/12 spreads the load over a band.
4. Failure then occurs by horizontal tensile splitting at the central portion as intended.
5. Sound, moisture and prestress are not the role of the strip.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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