white cement

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

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Re: white cement

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.heidelbergcement.com/NR/rdonlyres/0B6CCD53-9850-4242-A3D1-C68CE41F2999/0/Vitcement_Eng.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.

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Re: white cement

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

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Re: white cement

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

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