vtsnowedin
Elite Member
The same plant can put out dozens of different mixes with cement factors from four bags to a cubic yard to ten bags to a yard and with add-mixtures like fly ash and ground mill slag along with air en-training agents and water reducers. The stuff the state puts in their bridge decks has all the bells and whistles and often tests 6000psi or better but cost $900 per cubic yard complete in place. The contractor pouring a private driveway for a price ordered something less and then may have done all the other bad things Mossroad mentioned and a few more. Not all concrete crews have the same knowledge and skill.