Is the half-life and expansion ratio important properties of bitumen emulsions?

Answer 1

Yes it is

Expansion ratio. This is the ratio of the maximum

volume of the asphalt in its foamed state to the volume

of asphalt once the foam has completely subsided.

Half life. The half life is the time in seconds it takes

for the foam to settle to half of the maximum volume

attained.

Both expansion ratio and half life are influenced by

the grade and type of asphalt, as well as by the

amount of water injected into the hot asphalt during

the foaming process. Logically, the greater the expansion

ratio, the less viscous the asphalt will be and the

result should be a better dispersion of the asphalt in

the mixed product. Likewise, a longer half life implies

there is more time for the asphalt to be mixed with the

material while it is still in its foam form