Discussion
A clinker contains 60 per cent alite, 15 per cent belite, 8 per cent aluminate and 10 per cent ferrite. What proportion is accounted for by the two silicates?
Answer: D
Adding 60 and 15 gives 75 per cent. The silicates dominate a Portland clinker and between them supply almost all of its strength, with the interstitial phases contributing comparatively little. Alite alone typically accounts for over half of a Portland clinker.
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