Jet grouting produces cylindrical body made ​​up of a mixture of grout and soil particles in the ground , which have improved characteristics compared to the native soil. It completely breaks the structure of the soil, and the particles are mixed with a binder, an we get homogenized mass with improved properties.

The technology is used in various types of soil with different grout :

  • water- cement mixtures
  • water- cement - bentonite mixture
  • lime (pure lime , lime with cement , etc.) - in special cases
  • Used extremely high pressures : 30-70 MPa .

Fluid is injected into the ground speed of 250-330 m / s and the high speed of the fluid used to break up ( cutting ) the structure of the soil , moving particles and their mixing with cement mortar

There are three main methods of performance jet grouting :

  • Singlefluid system ( injection mixture )
  • two-fluid system ( mixture - air or a mixture - water )
  • trofluidni system ( mixture - water - air )

Performing injection of the 2 - fluid system achieves nearly twice the diameter of the cylinder 1 in relation to the fluid , and a 3 - fluid system it is approximately 3 times the diameter of the cylinder 1 with the built - fluid system , but only 50 % in relation to the performance of the 2 - fluid circuit .

Consumption of cement increases with the volume of the injected body but its share in a mixture of cement - soil particles fall . This is partly explained by a certain decline in the strength of the soil mass injected at work with more fluid compared to one .


The price of equipment to work with a much more fluid increases , which significantly affects the price of the final product .

GEOINVEST društvo s ograničenom odgovornošću za geotehničke radove
Braće Radić 30, hr-42000 Varaždin / T +385 42 200 255 / F +385 42 200 257 / E 

OIB 68413703272 / MBS 070066502 / SUD Trgovački sud u Varaždinu / TEMELJNI KAPITAL 30.000,00 kn / UPRAVA Ivan Crnković, Zlatko Kovačić