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109 comments on A Pretty Stunning Graph of World Cement Production (and China is Certainly Using It)
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Hey Starship not only do you have me reading 'things I don't want to read about' but also looking for more! How are you on types of cement? Two reasons, first I found this quote below in Wikipedia and noticed the mention of "low-energy" cements would you elucidate?
Calcium sulfoaluminate cements are made from clinkers that include ye’elimite (Ca4(AlO2)6SO4 or C4A3\bar \mathrm{S} in Cement chemist’s notation) as a primary phase. They are used in expansive cements, in ultra-high early strength cements, and in "low-energy" *cements.
Second reason is that years ago I used a black cement in a bit of sculpture, I was told at the time that it wasn't Portland and no colourants were added. I have no idea what it was but it was great stuff, does this poor description ring any bell? Have asked at various local cement purveyors to be only met with a concrete and stony silence.
*my bold
Hey CrystalRadio- your "black cement" is actually fly ash concrete, an inexpensive alternative to Portland. It is easily manipulated when wet, but requires little water- great for sculpture, it is also environmentally friendly because it is recycled from the remnants of coal production. Gives a smooth finish, but sharp detail.