Applications - Trass
The special mode of action of trass is due to the fact that trass reduces the porosity in the capillary pore range and makes the microstructure denser without restricting vapour diffusion. This, together with its capacity to combine with lime, has the effect of restricting the transport of pore water that contains lime and salt to the surface of the component. This can significantly reduce the efflorescence of mortar and also improve the moisture stability of the structure.
Mortars and plasters that contain trass have particularly good workability and resistance to wear. The stresses between mortar and stone are reduced due to the slow strength development coupled with sufficient final strength. Trass also gives improved elasticity to the hardened mortar.
Products made with trass are resistant to aggressive ambient conditions and when used as exterior plaster can protect valuable historical building materials.
Trass products are used as bedding mortar when laying high-grade natural stone slabs and tiles, as repair mortar when repairing buildings and as grouting mortar (particle size up to 0.1 mm) for filling voids and cracks in dilapidated brickwork.