Resolve cracking in pre mixed mortar

Answer:

1. Reduce the porosity in plastering mortar by controlling the gradation and modulus of aggregates; At the same time, it can also improve the workability of mortar.

2. Use additives with bonding, water retention, and slight expansion properties, such as mortar thickening powder, to reduce water usage, minimize shrinkage caused by water loss, and prevent the formation of cracks.

3. Adding a certain amount of mineral admixtures (such as fly ash and aluminum silicon powder), mineral admixtures contain a large number of glass microspheres with a large surface area. When having the same consistency, especially aluminum silicon powder, not only increases strength, but also reduces cement hydration heat and micro expansion function.

4. Adding an appropriate amount of quicklime can form a gel like dispersed state of calcium hydroxide, which adsorbs a thick water film on the surface and has good plasticity, reducing water consumption and minimizing shrinkage and cracking.

5. Adding an appropriate amount of polymer dry powder can increase the adhesion of plastering mortar on different substrates.