What materials are used in slurry wall?
Slurry walls are deep wall structures made of concrete, reinforced concrete or binding agents in the building ground. They have a static or sealing function. For their production trenches are excavated in panels. A support fluid, usually bentonite suspension, prevents the soil around the trenches from caving in.
What is slurry trench wall?
A slurry cut-off wall or slurry trench wall is typically excavated using a backhoe (or grab) while simultaneously pumping a hydrated cement bentonite mix into the trench to depths in excess of 25m. Once cured, the slurry cut-off wall provides a permanent low permeability barrier to groundwater and leachates.
What is slurry in cement?
Cement slurry is a mixture of Portland cement, water, and additives. The cement slurry used in the drilling industry is a cement suspension with a high water content and a relatively low viscosity.
What are slurry walls used for?
Slurry walls are used to contain contaminated groundwater, divert uncontaminated groundwater flow, and/or provide barriers for groundwater treatment systems. Slurry walls are placed at depths up to 200 feet and vary in thickness from 2 to 4 feet.
How does a slurry wall work?
A slurry wall is a civil engineering technique used to build reinforced concrete walls in areas of soft earth close to open water, or with a high groundwater table. This technique is typically used to build diaphragm (water-blocking) walls surrounding tunnels and open cuts, and to lay foundations.
What is slurry concrete used for?
Cement slurry is essentially cement mixed with water and other chemical admixtures required to maintain a homogenous mixture. It is a cement-treated material commonly used for soil stabilization projects ranging from road projects and parking lots to large industrial or commercial construction projects.
What is concrete slurry used for?
What kind of wall is a slurry wall?
Slurry Wall Construction A slurry wall is a reinforced concrete wall, particularly used in top-down construction for deep permanent structures. Slurry – a polymer and water mixture – fills an excavated trench to prevent soil excursions.
What is the first step in slurry wall construction?
Excavation: The first step of slurry wall construction is the excavation of trenches for reinforced concrete walls. The clamshell shaped digger or hydro mill trench cutter is used to make a trench and create a form for a reinforced concrete wall.
What kind of equipment is needed for slurry wall construction?
Slurry wall construction requires the use of heavy construction equipment that requires reasonable headroom, site area, and considerable mobilization costs.
Why is slurry used to fill a trench?
The excavator is then lifted and moved along the trench guide walls to continue the trench with successive cuts as needed. The trench is at all times kept filled with slurry to prevent its collapse, but the liquid filling allows the excavation machinery and excavation spoil to be moved without hindrance.