cured the next layer is poured on top additional pour layers may be poured until a desired height is reached in the preferred embodiment each pour layer has a depth of approximately 3 0 feet a 3 0 ft pour depth has been found to be suitable due to the fact that the pre cured ef mixture is formed with compressed air and a foaming agent and pours in excess of 3 0 ft may tend to increase the density of the lower portion of the pour as the weight of the material forces air out of the mixture it should be noted however that any suitable pour depth is considered applicable to the present invention ef has a relatively low viscosity and low density thus exerting a small lateral load on the tilt wall until it becomes hardened it should be noted that in the bridge abutment application of this invention the bridge piles and pile caps are preferably already installed prior to the ef being poured the bridge deck may be laid either before or after the ef is poured once the ef is layered to a desired height the roadway base and pavement are installed according to local state department of transportation standards fig4 is a cross sectional view of the bridge approach and abutment structure at the anterior wall 12 as best illustrated in fig4 tilt wall panels 12 rest vertically on concrete footings 24 and.