Discussion
Consider the following statements about durability.
1. Sulphate attack involves the aluminate phase.
2. Alkali-silica reaction involves reactive aggregate and cement alkalis.
3. Both are prevented by increasing the water to cement ratio.
Answer: B
The first two identify the two mechanisms correctly. The third is precisely backwards, since a higher ratio gives a more permeable concrete and makes every form of chemical attack easier. Permeability rather than strength is the governing property here.
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