https://boards.4channel.org/x/thread/35517011

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Anonymous 08/07/23(Mon)13:24:12 No.35518795▶>>35518810
File: Il_segreto_del_cemento_ro(...).jpg (1.97 MB, 4320x2011)
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>>35518740
The Roman cement formula involved the use of lime, pozzolana and volcanic tuff, which were activated with the use of sea water, and hardened by cementing the compound into the desired shape. Compared to the cement in use today, the formula was very different: the so-called Portland cement, the most common today, in fact uses a compound obtained by cooking clay and limestone at high temperatures, called clinker, mixed with chalk and then sand. It obviously has many useful characteristics, but in terms of resistance it cannot compete with the Roman one: in fact, modern concrete has a duration of between 50 and 100 years, beyond which it is destined to crumble, and therefore requires continuous maintenance, if not the replacement and demolition of structures
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Anonymous 08/08/23(Tue)01:53:43 No.35523404▶>>35523559 >>35523960
It's actually a very uncommon concrete admixture. I've probably tested enough trucks of concrete to build every bridge in New York City, and there is alot of weird chemicals they put in there (interestingly enough, basic sugar is one of them, it retards the reaction), and maybe one of them is derived from cow blood, but like these decisions are made by extremely boring engineers in kirkland jeans, not Rothschilds.

I think the blood one specifically is to curb the alkaline-silica reaction (ASR) by giving the silica present in some aggregate (like beach sand) something much more attractive to bind to. If the alkaline concrete binds to the silica, it forms an expansive gel that puts the concrete under stress and causes aggregate de-adhesion and substrate fractures. It's one of the big reasons why island nations get so extremely fucked from an earthquake, they use their cheap as shit beach sand, which makes all the concrete made with it extremely fragile.
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