Having the upper floor in or some bracing before back fill is compacted helps prevent basement walls from moving or cracking, but then you run the risk of rain or snow getting into the excavation also.
Thanks, and yea I know what you are talking about, I have used both R and CBR values to develop cross sections for many unpaved and paved roads. I haven't dismissed GPT's comments either, I do use the axle loading for the fire trucks.
I'll stick with what I know and should have expected the...
This isn't for a building it is for a gravel road. The fire department requires dirt roads to be able to hold a 75,000 lb truck.
That is why I need this.
Has anyone used this before? Is there an ASTM standard? What is the test called.
We used it at a site in South America. The same hammer, count the blows to penetrate the ground 15cm like the SPT but there was a solid cone at the tip instead of a SPT barrel.
Our proctor was 119.1 pcf at 13.9%, which seems a little low to me for base course. We had another done at the pit with 122.7pcf and a moisture of 11.3%. It does seem like the recycled concrete base course does require more compactive effort than regular base course.
Basically what we ended up doing is laying down 4" lifts, had the semi's run over it and a new vibratory smooth steel drummed roller go over it eight times. Total thickness was 8 inches. The base course looked like it was aggregate with concrete fines in it already, so I wasn't to worried...
Thanks for the info guys, I'll check and see about the modified test actually cruching the material, that does make sense. There could possibly be recycled asphalt in the material I suppose, but I haven't seen any of it.
