my house in the lake tahoe area (think lots of snow in winter) has an asphalt driveway. A small hole (2" by ~5")has developed where the driveway runs over a CMU retaining wall (the house is built on a slope) and into the garage. The hole appears to be on the back side of the retaining wall. What kind of fill is appropriate to fix this? A hardware guy told me pneumatic concrete, but have not found this material.
ask the kc termite,,, he's the moderator UP on odd cretes
far's me, i'd say the base has washed out under the hole,,, grab up a bodacious iron bar & ' stick ' that hole til you feel bottom,,, fill it w'soupy conc/mortar/topping mix as you wish, then patch the top w/cold patch,,, you can get all that stuff at any apron store.
have been fixing conc for 37yrs & the only ' pneumatic ' conc i ever saw was shotcrete ( pneumatically applied concrete ),,, when you can, ask him how he defines that term, would you ? ? ?