2007-08-12 22:25:01 · 3 answers · asked by Bossman ™ 4 in Science & Mathematics ➔ Engineering
really dumb cement perhaps ?
(actually, at a guess, I would say it's cement that fails to 'harden' as expected .. however you really should learn that typing this into Google will give you an answer today, whilst posting here may mean you never get an answer :-) )
2007-08-13 23:22:34 · answer #1 · answered by Steve B 7 · 0⤊ 0⤋
More or less right, here in the oilfield we use G class cements to isolate the wellbore casing from the rock formation. The problem is that we might need to pump up to 40,000 gallons of the stuff. This takes time so we "retard" the liquid cement slurry with chemicals. These chemicals are basically sugars which coat the cement particles with sticky stuff which eventually washes off and allows the cement to do it's business. For this reason any retarding chemicals are always added to the cement mixwater (a concoction of chemicals which give the cement it's properties) last as it's the only chemical which expires. FYI cement can also be accelerated with salts.
2007-08-16 10:45:03 · answer #2 · answered by thequestioner 2 · 0⤊ 0⤋
its cement that is slow setting.
2007-08-15 19:43:01 · answer #3 · answered by r wall 3 · 0⤊ 0⤋