On Thursday, June 10, 2021 at 9:03:52 AM UTC-5, wrote:
I gave you the reference to what I said, that concrete varies in what it is made of and for from a number of different things. But of course you're telling us that the Boulder Dam was made with "Portland" cement when that is not the case.

I'm guessing many, most, people use cement, whether officially "Portland" or some other variation, and concrete somewhat interchangeably. Technically, officially, the cement is what holds everything together in the concrete mixture. Its one ingredient in the concrete recipe. Cement, sand, stone, water = concrete. But if you say the Boulder Dam is made with cement is similar to saying you drive a steel car. The body panels may be steel. Or aluminum if a Ford F-150. But there is also cast iron and other alloys in the car too. Not steel. Most sane, rational, intelligent, even just marginally intelligent, people are not going to scream and whine about it.