What is the reason for the accelerated separation of water from solid constituents (cement grains) in slurries with high w/c-ratio under (relatively) cold conditions?
As the temperature is reduced, the Brownian motion of the particles in suspension is reduced as the internal energy is lower. This increases the ratio between the magnitudes of the gravity forces and the internal forces, leading to faster separation.
EDIT: Einstein dealt with this, incidentally - see https://en.wikipedia.org/wiki/Brownian_motion
As the temperature is reduced, the Brownian motion of the particles in suspension is reduced as the internal energy is lower. This increases the ratio between the magnitudes of the gravity forces and the internal forces, leading to faster separation.
EDIT: Einstein dealt with this, incidentally - see https://en.wikipedia.org/wiki/Brownian_motion
Reactivity of Cement/contentious materials is slow at low temperatures. Hence setting does not happen causing it to remain in suspension.
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