" wrote in
oups.com:

We did something similar to this.
We placed a 3" "rat slab"; set out brick on that; swept a mix of sand &
cem.ent into the joints; sprinkled the surface to set the mix.
Some of the joints didn't set properly, but the drive is in good shape
18 years later.
TB


What is a rat slab? And how big were your joints?