bad/dry aggregate is possible altho, between plant & your house, conc in barrel should've had enough time to 'wet' so don't think its due to 'dry rock',,more likely cause is alkali imcompatibility issue between cement source & imported aggregate,,, ran into this yrs ago on nysdot job,,, spall repairs we did prior to winter shutdown came out of the ground by the time we returned in the spring so had to replace,,, we changed to magnesium phosphate & never had an issue after the mtls change
depending on the topography of your lot, could be a sub-conc hydrostatic wtr issue,,, do you have know if there was a vapor barrier installed under the garage floor's conc OR any other part of your very fine home's conc floors ?
depending on the spalls effect on your floor's integrity, probably a live with it issue - call me when we finally move in !
how many in a sq ft ? avg diameter ?
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