Flue pipe cemented in

[nwohio]

I may have made a mistake...
I had a masonry chimney built as part of a room addition. The chimney is a prefab chimney block with a hollow 4 inch block veneer to give it more "beef" and an 8" (outside measure) clay flue. The mason left an 8-9" square opening into the verticle part of the chimney for my flue pipe. I struggled to figure out how to tie my round pipe into the square whole...
My solution was to install a double wall stainless pipe thought the approximately 8-9 inches of masonry work and cement it in. I used Meeco's Red Devil castable Refractory Cement and packed it into the opening around the stainless flue pipe.
Then this morning it hit me, this pipe is going to expand. Do I need to break this pipe out and do it different?

 

[Ludlow]

Not sure the class A was even needed. Other than that there will be very little expansion of the outer casing. Most of the expansion is linear and confined to the inner pipe. The outer pipe will have very negligible expansion of diameter.