Soil modification is changing the characteristics of soil by adding soil amendments to strengthen physical and chemical conditions to improve the bearing capacity of the soil. Soil modification processes include using excavators with rake attachments and augers. Our soil modification techniques include mass soil mixing, deep soil mixing (with multi augers) and jet grouting. We are able to customize our equipment to each site’s complexity and complete the job utilizing specialized equipment including ALLU mixing heads, augers, and multi augers.
RECON provides clients an economical, reliable, and time-saving way of satisfying a difficult set of technical perimeters related to the remediation of contaminated soils. We perform soil modification work on owned equipment with experienced equipment operators. Our techniques have numerous civil and environmental applications such as providing stable ground support for building and bridge foundations and retaining structures, as well as liquefaction mitigation, groundwater control, temporary support during an excavation, and containing hazardous wastes and sludge.
RECON’s soil modification techniques include:
- Mass Soil Mixing
- Auger Soil Mixing
- Deep Soil Mixing
- Allu Mixing Head
- Jet Grouting
Soil mixing is a construction technique that uses an engineered grout or another reagent to modify the physical or chemical characteristics of soil without excavating. The intent is to modify the soil so that its properties become similar to that of a soft rock such as clay shale or lightly cemented sandstone. RECON uses augers or excavators to mix reagents with the existing soil to form these mixtures. RECON has used soil mixing to treat contaminated soil, sediment, and sludge. The technology is proven effective for treatment of both inorganic and organic hazardous constituents. Once the material has been stabilized, it can be excavated if needed. For mass soil mixing, such as stabilizing over 1.5 million cubic yards and soils up to 20 feet deep, RECON uses horizontal axis rotary mixing tools located at the end of a track hoe to consistently mix materials throughout the site.
RECON uses the Allu PMX mixer to evenly mix ground layers and underlying materials in situ up to 17 feet. The simultaneous rotation of the mixing paddles allows for a completely mixed area and is in conjunction with our data acquisition system that allows monitoring, recording and control of the feeding operation. This method allows for homogenous mixing through a site with undesirable or contaminated ground conditions.
Deep Soil Mixing:
Deep soil mixing is a soil improvement technology used to treat soils in situ to improve strength and reduce compressibility. The process involves blending the soil with a reagent and pumping that mixture through a hollow rotating Kelly bar to form a cement column. Powerful augers are used to mix the slurry of possolanic additives into a soil or sediment in-situ to stabilize soils for construction purposes.
Deep soil mixing provides a safe method of construction and omits the need for deep excavations, temporary works to adjacent buildings, export of contaminated fill, and does not require importing of fill material. This method reuses the existing soil, reduces the disruption on nearby utilities due to inducing low vibrations, and significantly reduces off-site disposal needs.
RECON is able to perform deep soil mixing activities in a variety of different environments.
Jet grouting is a soil improvement technique used for solidifying soils. To complete this process, RECON injects liquids containing grout or binders into the soil at a high velocity. These binders break up the soil structure and mix the soil particles in-situ to create a homogeneous mass that solidifies. This technology is applicable for increasing soil strength to support foundations and for reducing consolidation. Jet grouting can also lower the permeability of soil and thereby controlling the flow of groundwater for tunnel construction and basements, and mitigate the movement of contaminated groundwater.