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Mr_Sworld-
???? Should have been done and certified when the slab was poured. Test cubes should have been poured, soaked and pressure tested.
There are specialist grout products you can get (or alternatively go old school and use sand, cement and water) to fill the holes left behind once whirly bolts have been removed and formwork has been struck, it has the potential to be messy overhead but mixing it stiff, forcing it it and covering it whilst setting should get the job done.
Bobbo
Resin/bond the bit you cut out back in?