The basic unit of mass stabilisation machinery is an excavator onto which a separate mixing unit and a pressure feeder are attached. The mass stabilizing system comprises the following equipment parts:
- mixing unit
- pressure feeder
- control unit
- data acquisition system
Mass stabilization equipment currently in use allows for achieving the maximum depth of 7…8 meters in favourable circumstances, but the maximum depth achievable always depends on working conditions and on the quality of stabilized soil. When deeper mass stabilization is required, it is possible to use column stabilization equipment and make columns intersect each other. The optimal result is achieved for the layer stabilized to the depth of approximately 3…5 meters. However, thinner layers can also be mass stabilized.
A few examples of approximate efficiency levels observed for some typical aggregate types are presented below. The data was gathered in typical conditions. In general, it has been observed that depending on the case and due to some exceptional conditions, there might occur considerable variations in efficiency.
- peat stabilization approx. 100…150 m3 / h
- clay stabilization approx. 80…100 m3 / h/
- mass stabilization if dredged masses approx. 100…200 m3 / h
- firm clay or silt stabilization approx. 50…80 m3 / h
It is imperative that binders fed with the hose of the mixing unit are fine grained and dry in order to allow for their pneumatic transportation with compressed air.