I designed a structural floor slab and grade beam system founded on piles, and detailed the slab and grade beam as a monolithic pour. The contractor has asked if he could separate the pours, by pouring the grade beams first, and then coming back and doing the slab later. The top bars of the grade beam are in the slab, so there will be a horizontal construction joint at the slab-to-beam interface. I've heard of hydro-blasting the "green" concrete of the grade beam to create a rough surface. Does anyone have any experience with this method? If not, what other acceptable methods are typical? Job is near Boston, Ma.
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