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I asked the project engineer if there was a specification for the backfilling operation. He was not aware of it. I was told that the contractors follow an industry practice. I am a retired analytical chemist by profession. so fairly new to geotechnical industry I ask a lot of questions...

The footing subgrade was not frozen when the concrete was poured.. And it is below the frost line. That is correct, the footing and walls do not bear on the backfill. Eventually , 4 inches of gravel and on top of it 4 inches of concrete will bear on the backfill but the edge of the finished...

The backfilling is on both sides of 3 feet deep footings and foundation walls. How much frosty material? About 5%. Fills already in place are not protected overnighted. But contructors fill and compact to subgrade level. No partial backfill. The subgrade of the pad is frosted right now, I was...

I am an inspector for a backfilling operation right now where the temperature range from 21 F to 32 F during the day. The pile of dirt removed for the excavation of the footings has frosted on the surface but underneath the soil which is mostly sandy is not frozen. Sometimes though there are...