Resistance to cracking of microcement
Microcement is a mortar with a slight flexibility provided by the resins used in its mixture. This allows it to cushion micro-movements in the base, although if the base suffers more important cracks, due to settlement of the building, thermal contraction or others, they may end up being transmitted to the microcement, if the appropriate measures are not taken.
We have elastic base preparation systems that avoid cases of crack transmission in the most compromised cases (radiant heating, new construction, and mortar slabs in general)
Rigid systems such as epoxy resins, or the placement together with the microcement of fiberglass mesh a few microns thick are not able to withstand the strength of the 10 cm thick concrete slab reinforced with 6-inch steel mesh. 8mm thick underneath, when it wants to move
The most complicated cracks to bridge are the new ones, since the elongation between two points that are joined and separated is infinite. For this reason, it is advisable to allow the screeds to set for ideally 1 month before applying the coating.
– Temperature differences in the slab (radiant heating, hot water pipes or solar heat)
Some of the shrinkage is absorbed by the low flexibility of the concrete. Some of the shrinkage is accompanied by the entire building, although stresses may arise that cause cracking.