The concrete guys poured the basement today and put my curiosity to rest, when I saw them pour the concrete through the basement access door on the 1st floor deck.  I was mistaken about the garage being poured.  They told me that they will come back later and do that.  Their reasoning was that contractors use the garage throughout construction so it gets beat on. 

Rocky Concrete

As I mention in the video below, the concrete crew (who’s from out of town) used a local supplier for concrete on the basement floor.  In speaking with them, they said that the concrete mix was much rockier than they were used to.  This made me wonder what issues can arise from rockier concrete.  So, I did a little Googling and found that rockier cement has a higher compressive strength than sandier cement.

Here’re a video of the process and results: