Abstract
For concrete and other cement-based materials, cement hydration induces Le Chatelier contraction. This phenomenon creates negative pore water pressure, which increases the bulk and interfacial granular stresses and affects both the interfacial and bulk rheological behavior of the dense mineral suspension.An original device was developed to assess this effect by simulating water suction in the cement-based materials undergoing hydration. An inert material with the same size range as cement was used to mimic the suction effects arising from water consumption, without the physical bonding effects due to cement hydration. Consequently, the effects of water pressure on friction and yield stress were measured on different mix-designs. The main results are an increase of the yield stress with negative water pressure and a decrease of this yield stress with the increase of air content.
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