[papercreters] Re: Borax

Wikipedia:

When traditional Portland cement is mixed with water the dissolution of calcium, sodium and potassium hydroxides produces a highly alkaline solution (pH ~13):

Calcium hydroxide is building lime.


European Standard EN197-1:

Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates (3 CaO·SiO2 and 2 CaO·SiO2), the remainder consisting of aluminium- and iron-containing clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass.

So upto a third by weight of cement is other things than calcium silicates.


(For some reason its not quoting your post.)




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