Discussion
Assertion (A): Ultra-high performance concrete usually contains fibres.
Reason (R): Very high compressive strength does nothing to improve the brittleness of the material.
Answer: D
Both are true and the reason gives the need: a stronger matrix is if anything more brittle, so fibres are added to provide the ductility that would otherwise be entirely absent from such a dense mix. Fibre type and dosage are part of the mix design rather than an extra.
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