AN EXPERIMENTAL STUDY ON THE PRESSURE OF CEMENT BASED MATERIALS AGAINST FORMWORK

Abstract eng:
An experimental study on the pressure of cement based materials against formwork is reported. The object of the investigation was to experimentally determine the evolution of pore water and lateral pressures of cement paste until the form is removed. An original experimental device equipped with two special transducers was designed. These transducers make it possible to measure the pressure due to 1 meter and 0.05 meter depth of cement paste. Tests are carried out with four types of cement pastes, the water/cement (W/C) mass ratio ranging between 0.30 and 0.45. The results show that the kinetics of the pore water pressure and of lateral pressure are strongly affected by the W/C ratio and the level of stress to which the cement based materials is subjected. In all cases, initially we obtain levels of total and interstitial pressures equal to a theoretical hydrostatic pressure exerted by homogeneous fluid having the density of the mixture. Then, they decrease in a perfectly identical way toward zero. We record then interstitial depressions whose maximum value can reach tens of kPa.

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