Placement of HUB 100 II (US SPEC MP Grout) underneath structural steel at the “flowable” mix rate. Swinterton Construction wanted the higher strength so they had to help the grout under the plate with a piece of metal strapping. When doing a really thin application there is a lot of surface tension between the grout, the plate (they're putting the grout under) and the concrete (they're putting the grout on top of). Unless the mix is completely “fluid”, the grout sometimes needs help to move beneath the plates. The reason they don't go to “fluid” is because they want the higher strengths that they get when they keep it at the “flowable” rate. Building a gravity feeding grout form is another method of forcing grout to flow across the entire plate.