On another tread, I typed up a bit about Portland Cement. Now I am not a chemist at all, in fact I am rather dismissive of them.  Having said that, 5 Chemists that I have chatted to informally have been very good at explaining what happens without relying on using memory test in Latin. One Chemist, a recent PhD graduate was working in sales and explained long chain polymers to me, they are really quite simple, repeating 'units' that attach to each other. Another one, again a PhD i