Să se determine natura agresivităţii şi gradul acesteia în cazul unei ape care conține: - CO2 liber 40 mg/l,
- are Dt = 9 oG,
- sulfați 1200 mg/l,
- celelalte componente sunt in concentrații neglijabile.
Să se stabilească măsurile de protecţie primară dacă apa acţionează asupra unei construcţii din
beton armat, cu diametrul maxim al agregatelor dmax= 31,5 mm.

The net force is 100

It can be classified based on its

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.