Tekfoam - Minova Global
TekFoam Family of Products
Low Strength (<10 mpa)
Tekfoam cement is a foamed mix for use in cavity filling and back filling. Although the primary use for Tekfoam cement is the filling of cavities on longwall sections, other popular uses include back filling over a set of arches to provide contact against the roof, filling a cavity to prevent methane buildup, and cushioning against falling debris over false roof.
Tekfoam cement is a non-combustible, void-filling, structural cementitious foam. Supplied as a powder, the cement forms a low-density foam (0.25 to 0.35 sg) when combined with the proper amount of air and water in the specially designed placer unit. Normally, four 45 lb bags/yd3 (5.23 bags/m3) are used. Tekfoam mix is typically pumped 400 feet (121.9 m) through a 1” (25.4 mm) diameter hose, and farther through a larger diameter hose. The 20 psi (0.1379 MPa) product begins to gel in minutes, forming a non-toxic, non- combustible product weighing approximately 540 lbs/ yd3 (320.4 kg/m3), and because of its rapid strength gain, is firm enough to walk on in 30 to 60 minutes. Consult your local Minova representative for additional application information.
- Fast – Pumping rate of over 100 yds3 (76.46 m3) per shift is possible; convenient one bag blend
- Simple – Placer unit meters in proper amounts of air and water while pumping the foam to the site
- High Yield – Less material to handle; four 45 lb (20.41 kg) bags will yield 1 yd3 (0.76 m3 ) - the result is less costly than typical foamed cements
- Safety – Roof falls and cavities can be supported safely; low causticity absolutely minimizes the possibility of cement burns
To calibrate the placer unit and to make adjustments to the water supply, it is highly recommended that a consultant from Minova, or an authorized contractor, be on site to advise mine personnel, especially during the pumping process.
Build a form to hold the foam in the desired location. Formwork can be of light-weight construction unless the foam is also to provide roof support. Tekfoam cement can bridge gaps over 1” (25.4 mm) wide.
Run at least 200 ft (60.7 m) of 1” (25.4 mm) hose from the pump to the cavity area.
In the case of a cavity that needs to be filled remotely, install two 3” (76.2 mm) diameter or greater stand pipes into the cavity. One pipe needs to go into the highest point of the cavity, while the other pipe can be lower.
Run the 1” (25.4 mm) discharge line up the lower stand pipe.
Hook up fresh water at a rate of 15 gpm (56.8 L/m) at 50 psi (0.3447 MPa), and AC power, to the placer. Twenty-four gallons (90.8 L) of water per 100 lbs (45.4 kg) of Tekfoam powder are required.
Pump the Tekfoam mix into the cavity until it emerges from the higher stand pipe.
45 lb (20.41 kg), 3-ply bags with 1 polyethylene layer, 48 bags per stretch-wrapped pallet.
One year in dry conditions.