Superfine grouting material and superfine cement?

The superfine cement grouting material and superfine cement? Said is different, the superfine cement is a very fine particles of the cement mill, is more smaller than ordinary cement; The superfine cement grouting material, usually said the aggregate in the grouting material is thinner, such as ordinary grouting material is about 3 mm sand, the superfine cement grouting material may use is 0. 3 mm of the sand, but the cement is the ordinary cement.