Statistical model for predicting the maximum lateral pressure exerted by Self-Consolidating Concrete on vertical formwork

Abstract In order to design vertical formwork on a construction site, it is necessary to have a model that predicts the lateral pressure exerted by self-consolidating concrete (SCC) and does not require the determination of rheological or tribological parameters through a laboratory test or with a specific device. Due to the mix design, this type of concrete does not require any vibration method and can be filled continuously without presenting segregation. Therefore, high placement rates (over 10 m/h) are common practice today. The aim of this work is to develop a statistical model that predicts the maximum lateral pressure exerted by SCC on vertical formwork. However, considering the conditions of placement, for this type of concrete on real constructions, another principal objective of the model is to obtain an accurate prediction of the maximum lateral pressure when SCC is poured at placement rates of over 10 m/h. The model takes into account seven of the variables that affect the lateral pressure of fresh concrete: placement rate, slump flow, height of the concrete piece, concrete temperature, cement type, minimum dimension and size of the cross section. 131 experimental data were collected from the literature and were considered for the formulation of the model. In addition, a survey was conducted with 105 construction managers from different companies in over 20 countries. The results show that the model presents a very good approximation to the experimental data, especially for high placement rates.