norew
99 posts
TimePosted 24/08/2011 09:39:06
norew says

Physical Appearances of Clinker and Its Implications

Do you have any documents regarding this matter?

 

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Ted Krapkat
536 posts
TimePosted 25/08/2011 06:26:01

Re: Physical Appearances of Clinker and Its Implications

Hello Norew,

Do you mean colour?

Regards,

Ted.

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norew
99 posts
TimePosted 01/09/2011 11:03:31
norew says

Re: Physical Appearances of Clinker and Its Implications

Yeah..color,texture etc. Ted. and their implications.

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Ted Krapkat
536 posts
TimePosted 02/09/2011 06:22:03

Re: Physical Appearances of Clinker and Its Implications

Hello Norew,

Clinker colour is largely governed by the ferrite (C4AF) content. (The lower the C4AF the lighter the cement made from that clinker.)  However colour can also be significantly influenced by trace metals, degree of burning, reducing conditions in the burning zone and the extent of oxidation of the ferrite phase during cooling.

Iron, manganese, zinc, titanium and chromium all cause clinker to become darker. Reducing conditions and high burning zone temperature cause the clinker to become lighter because of the reduction of Fe+3 to Fe+2.  Significantly under-burnt clinker can also produce a noticably lighter cement.

The implications of colour changes are often as important to the customer as cement performance. But that depends a lot on the type of application for which the cement is used. For example, significant changes in concrete colour during a large volume project such as a bridge or high-rise building could be disasterous for cement sales.

I'm not sure what you mean by texture. Are you talking about the texture of the interior of nodules? (ie porosity/density)

Regards,

Ted.

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