Can anybody offer an guidance for the anti-cracking mortar formula?

Alex

Alex

Moderator
42.5 Cement:400kg, sand 40-70:600KG, cellulose 200,000 viscosity: 2KG, Redispersible Polymer powder:5.5kg, the cost is cheaper compare others on the market. After 30 hours on the wall, rub it with hands and there is a slight white. Can anybody offer a solution?
 
The related factors affecting the crack resistance are mainly the mortar folding ratio and interface cohesion. There are fibers, redispersible polymer powder, and high-grade glue materials to improve the flexural resistance of the mortar, and the only way to improve the cohesive force is to add more redispersible polymer powder.

I recommend to add a tiny amount of 3mm fiber.
 
I suggest you add some cellulose ether and sulpho-aluminous cement. The formula, the simpler, the better. And the amount of cement can decrease to 350.
 
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