Vesuvius concrete

[Monilee]

I’ve started my floor. I’ve cut my form for my door/entryway. In Puerto Rico I couldn’t find the smooth bricks for the floor so all of the WfO will be with firebrick, which leaves my floor a little uneven. My biggest problem I’m having is that the Vesuvius refractory cement that I was able to find in P.R., has lots of Little Rocks! It’s not like working with regular mortar, it’s more like a concrete that you would pour a mold or slab with. I’m so bummed bc there’s nothing else available here. Can I sift out the rock, maybe add a little more Portland and use it anyway?i can’t get fire clay here either. I’m ready to start laying my walls, but not sure where to go from here with this rocky concrete!!! Any ideas are so very greatly appreciated!!!
Thank you!!!
i keep trying to post fotos but it’s not working for some reason.