Discussion
Comparing Portland pozzolana cement with ordinary Portland cement, the pozzolana cement has
Answer: C
Correct answer: slower early strength but better durability
The pozzolana reacts only with the calcium hydroxide released as the cement hydrates, so it contributes nothing at first and strength develops more slowly in the early weeks. In return it converts that vulnerable calcium hydroxide into more calcium silicate hydrate, giving a denser, less permeable paste with better resistance to sulphate and chloride attack.
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