What is the typical range of alkali content for low-alkali cement?

The typical range of alkali content for low-alkali cement is indeed characterized by being less than 0.6%. This standard is significant in the context of construction materials because alkalis can influence the durability and performance of cement, particularly in relation to alkali-silica reaction (ASR) which can lead to expansion and cracking in concrete.

Low-alkali cement is specifically formulated to mitigate these risks, ensuring that the alkali content remains below a threshold that could potentially lead to adverse reactions with silica-containing aggregates. This makes option B the correct choice, as it aligns with industry standards and practices aimed at promoting the longevity and structural integrity of concrete.

The other options either exceed the typical limits for low-alkali cement or do not accurately reflect the established guidelines for alkali content in this category of cement.