Aci — 351 Foundations For Static Equipment

A unique strength of ACI 351.1R is its detailed attention to non-shrink grout. Between the steel equipment baseplate and the concrete foundation lies a 25 to 50 mm layer of epoxy or cementitious grout. To many structural engineers, this is a "non-structural" filler. To ACI 351, it is a structural hinge. The report specifies requirements for compressive strength (typically exceeding 80 MPa), modulus of elasticity, and flowability to ensure full contact. It warns against the common failure mode of "grout hydraulicing," where dynamic loads pump oil or water under the baseplate, eroding the grout and creating voids. Properly installed grout, per ACI 351, transfers shear and compression while accommodating differential thermal expansion between steel and concrete.

: Frequently used to support lighter structures like electrical bus supports or transmission poles. 4. Construction and Grouting aci 351 foundations for static equipment