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Cement standards accommodate new binders slowly chiefly because

  • A.long-term durability evidence takes decades to accumulate
  • B.the tests that would be required have not yet been invented
  • C.no laboratory anywhere is able to measure their strength
  • D.they cost rather more than ordinary cement does to produce

Answer: A

A structure is expected to last for many decades, and no accelerated test yet substitutes fully for the record of a material that has been in service that long. Caution here is a considered position rather than mere conservatism.

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