The application of Flowmonta for environmental problems

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:576584

Sass, I; Caldonazzi, O; Beyer, T de ^[1]

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1. FlowTex GUT GmbH, Amsdorf (Germany)

The combination of Horizontal Directional Drilling techniques with High Pressure Injection techniques led to the development of Horizontal Directional Injected Barriers under ground. Specially developed injection fluid mixture of Montan wax, cement and bentonite is the basis for the Flowmonta process. The first field test was made in a mining`s landfill in 1993. It confirmed the basic procedure. In a two-stepped, large-scale test in 1995, different injection techniques and injection fluids were tested. Intensive investigations in the field and in the laboratory were made. The Flowmonta-barrier then was excavated to enabled the direct observation and evaluation of the extent of the injections. During the first phase of the test several mixtures and injection techniques were tested. In the second phase a complete three dimensional sealing basin was created. The permeability of this sealing basin was tested in-situ. After excavation, hydraulic and mechanical surveys were made in the laboratory. By using the one-phase jet grouting technique, a penetrative depth of 12 meters on each side of the drilling was reached. A test using the Duplex technique resulted in a penetration of up to 2 meters and more on each side of the center bore. The permeability of the injection area was lowered by two exponential orders compared to the surrounding soil. SEM-images showed the structure of the injected material, as well as Montan wax spheres to have of 0,2 {mu}m to 2 {mu}m in diameter. X-ray diffraction, annealing and toluene-extraction gave a semiquantitative proportion analysis. Montan wax disproportion effects were observed in the barrier. Recently geophysical investigation methods still give no satisfying data.

• Research Organization: USDOE, Washington, DC (United States)
• OSTI ID: 576584
• Report Number(s): CONF-970208--Proc.; ON: DE98001967
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
BENTONITE
CONTAINMENT SYSTEMS
DIRECTIONAL DRILLING
GROUTING
MECHANICAL PROPERTIES
PERMEABILITY
POLLUTION CONTROL
X-RAY DIFFRACTION