posted on Nov, 11 2018 @ 07:41 PM
It looks like another method of cutting granite is to use hot water (if I'm reading this right)?
This guy apparently has a background in industrial sawing and chemistry, and proposed that chemistry was used to weaken the granite.
He gives a very technical listing of points:
" Quartz can be highly reactive relative to other constituent minerals4b
; in fact, at pH's above 10,
the rate of dissolution of quartz is several orders of magnitude greater than that of kaolinite (a
clay), and greater than that of diopside (a MgCa silicate), forsterite (a Mg silicate), and
feldspars [anorthite (CaAl silicate), and albite (NaAl silicate)]4c (Fig 5.1, p152)
Quartz dissolution rate is ~3-orders of magnitude greater at pH 12 than pH 64b (Fig 2.1, p22)
Quartz dissolution rate is over 2-orders greater at 70°C than at 25°C
4b (Fig 2.1, p22)
Quartz dissolution rate can be increased ~5x with NaCl (sea salt) 4b (Fig 6.9, p138)
Quartz is only part of granite, but if you weaken that component you weaken the whole rock.
The reason he proposed this is because the "feed rate" of the drill is proposterously good. Meaning the drill appears to be gaining too much depth
per each spin. Where the normal method of spinning a cylinder in an abrasive should require quite a lot of spins per cm of cutting.
I decided to google his claim about hotter temperatures making granite weaker, and got this:
"At temperatures above 100°C and high pressures the solubility of quartz increases quickly. At 300°C it is between 700 and 1200 mg/l,
depending on the pressure.
According to the paper, at room temperature the "solubility" is between 6 mg/l and 39 mg/l depending on what kind of quartz. It also
mentions that quartz trapped in granite is particularly susceptible to this effect.
It dissolves into a very weak acid, which returns to being quartz again as soon as the water cools, I guess? (I'm not super good at chemistry,
so I'm reading into this as accurately as I can.....)
I don't know what a high solubility is, but it seems to me like if you go from 39 mg/l to 700 or 1200 mg/l, that must be a pretty high solubility.
Causing the quartz to liquify (into the very weak acid) and probably makes it easier to cut.
But basically it looks like that's about all you need: hot water. Very hot water. Like maybe you boil it on a very hot flame?
edit on 11-11-2018 by bloodymarvelous because: clearer wording