Bentonite for construction
Bentonite, due to its properties of viscous and flowing solution formation, high thixotropy, water adsorption and high dispersibility, is used:
- In the construction of tunnels, including subways;
- As part of the “diaphragm wall” technology;
- As an injection solution for repair and restoration of waterproofing of underground parts of buildings, prevention of migration of pollutants and installation of impervious curtains;
- As part of injection and grouting mortars, which are effective for crack sealing and filling voids, including in the construction of hydroelectric power plants;
- As a waterproofing barrier material for the installation of impervious screens.
Construction bentonite clay powders have the following quality indicators:
| Key indicators | Units | Value |
| Properties of suspension at bentonite concentration | kg/m3 | 60 |
| Fann viscometer readings at a speed of 600, min | 40 | |
| Filtration, max | cm3 | 14 |
| Wet residue on the sieve 0.071, max | % | 2 |
| Slurry density | g/cm3 | 1.03-1.04 |
| Marsh funnel viscosity | sec | 37-45 |
| Static Shear Stress (Kügel Balls) | Pa | 20-33 |
| Yield point | Pa | 9.0-15 |
| Water loss (press filter) | cm3 | 15-17.5 |
