After two precast concrete elements are joined, the exposed metal connectors (e. g., bolts, nuts, shim plates, etc.) that are not covered by a slab topping are usually: Select one: a. epoxy grouted together. b. covered with a spray-on fireproofing material. c. cut with a diamond-blade saw. d. ignored; there is no need to treat the connectors once the precast pieces are joined. e. dry-packed with Portland cement grout.