Discussion
Assertion (A): Calcined clay is a more promising clinker substitute than fly ash for long-term use.
Reason (R): Suitable clays are widely distributed, whereas fly ash depends on coal-fired power generation.
Answer: A
Both are true and the reason gives the difference in prospects: one supply is geological and the other industrial, and the industry supplying fly ash is contracting in most countries that are trying hardest to reduce emissions.
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