Abstract
In a slipforming process, concrete is continuously poured and the formwork simultaneously raised so that the older concrete on the bottom supports the fresher on the top after a few hours of hydration. The objective of the present study is to examine the evolution of the concrete/formwork interface at very early age.An experimental device was designed to measure the evolution of the friction at this interface during the first hydration period. With cement hydration and thus water consumption, pore water pressure decreases and creates suction, which could increase granular stress on the formwork. The role of pore water pressure on formwork friction is investigated. The effect of mix-design parameter such as air content is described. Finally, a model that is able to predict the friction force at very early age (up to the initial setting time) is proposed.
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