Discussion
Waterproof or water-repellent cement is produced by
Answer: B
Correct answer: intergrinding a water-repellent admixture with the ground clinker
A stearate or similar water-repellent is ground in with the clinker, so the cement itself carries the admixture and no site addition is needed. The effect is to reduce capillary absorption at the surface rather than to change the fundamental porosity of the paste.
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