Pertaining to texture, yes.

Just recently, We had a clinker having a liter weight of nearly 1 but appearance wise it looks like a good clinker even from the inside. Its dark in and out.

Hello Norew,

Yes, this behavior with regard to litre weight is common with large "dusty" kilns. If you look at this kind of nodule under a microscope you will probably see a brittle, spongy (very porous) layer coating the surface. This is formed by clinker dust particles being stuck together by fragile melt bridges of either normal liquid phase or molten coal ash.

A porous layer such as this, on many nodules, can significantly reduce the litre weight of an otherwise normal well-burned clinker, producing a clinker with low litre weight yet low free lime. This confuses the normal litre weight vs free lime relationship. 

For more information on this subject see this thread;-

http://www.cemnet.com/cs/forums/thread/4634.aspx

Regards,

Ted.

Yes, It was really brittle..

Ted, do you have any images of the different appearances of clinker and its descriptions.

Hello Norew,

I only have clinker microscopy images of polished sections which have been etched with HF. These are also only in hard-copy form only at the present. I can try to scan them and email them to you if you like.  But I don't have anything of whole clinker nodules, if that's what you meant.

Regards,

Ted.