Dear Sirs
I would like to know from standards point of view if degree of whiteness of cement is specified , is it necessary also to limit the content of ferric oxide in white cement ?
Hamza
lalbatros
Iron(III) oxide or ferric oxide is not white:
See also:
http://en.wikipedia.org/wiki/White_Portland_cement
http://www.cement.org/decorative/specifying.asp
http://www.aalborgwhite.com/media/pdf_files/aalborg_white_-_engelsk.pdf
http://www.aalborgwhite.com/media/pdf_files/hvid_engelsk.pdf
http://www.lehighwhitecement.com/products/portland.html
I couldn't find any standard for ferric oxide in white cement, on google.
Seems logical.
It is all about whiteness and composition should be subject to the same standards as grey cemebt.
Hamza
Dear lalbatros
I noticed that some national standards specify a limit for ferric oxide ranginging between 0.5 and 1.0% in addition to degree of whiteness , so the question is still there !
hamza
lalbatros
Dear Hamza,
I don't see a question anymore, since you noticed the answer!
It might well be that some national standards have a limit on Fe2O3.
However, this limit would be redundant with the brigthness constraint,
as far as I understand.
It would be useful for this forum that you indicate which national standard is involved.
Michel