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Standard cube moulds for casting compression specimens are 150 mm × 150 mm × 150 mm. Under what condition is the smaller 100 mm cube mould permitted?
Answer & Solution
Correct answer: D.
1. The mould must contain aggregate without wall-effect interference.
2. The standard 150 mm cube suits aggregates up to 38 mm nominal maximum.
3. When the largest aggregate is 20 mm or smaller, the 100 mm cube is permitted.
4. Grade, curing duration and machine portability do not govern mould choice.
5. Aggregate size is the controlling factor specified by the unit.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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