Rates of placement discussion for the validation of experimental models of fresh concrete lateral pressure in walls

An analysis of experimental models for predicting fresh concrete lateral pressure in walls and bases was carried out, including a comparison of three rate of placements.Experimental data obtained from the bibliography were used for comparing the adequacy of the models, making a division into three placement rates ranges: under 2 m/h, between 2 m/h and 10 m/h and over 10 m/h.The comparisons were established not only in the different ranges but also taking into account the level of construction control, vigilance and inspection, considering in all cases safety and adequacy for better formwork design.The influence of concrete yield stress, evaluated from slump test, is also analyzed; the study shows a low correlation between concrete yield stress and the ratio maximum pressure vs. hydrostatic pressure for low rates of placement. On the other hand for higher rates of placement, the correlation increases.