Filling Between Blocks?

[Spuggy]

Hi All,

I am building a retaining wall in my garden, mostly out of leftovers from extension build. I plan on putting some steps in, but there is a triangular 150mm (ish) void inbetween blocks where the footings intersect. - slabs or blocks will be laid over the top to form the steps. Would a dollop or two of concrete be ok, or would it blow the blocks?


Any help would be greatly appreciated!

Cheers, Paul.

 

[noseall]

Concrete won't blow the blocks but should any water freeze within any poorly filled gaps, then this might.