Expansion (geology)

The expansion is the capacity of a ground “to be inflated” when its Water content W increases.

This amounts evaluating the variation of the Density apparent according to the water content.

The expansion varies according to the Granulométrie Granulat.

f= \ frac {\ rho_ {app, S}} {\ rho_ {app, H}} X (w+1) - 1

  • ρapp, s: Apparent bulk density dries
  • ρapp, h: Wet apparent bulk density
  • W: Water content

w=\frac{M_h-M_s}{M_s}

  • Mh : wet mass of the ground or aggregate,
  • Ms: mass dries of the ground (or considered as dryness, i.e. having passed 24:00 in a drying oven with 105°C).

This formula can also be expressed by

w= \ frac {M_w} {M_s}
  • Mw: Mass water

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