the use of lime in a mix will act like a plasticiser and give the mix greater elasticity when set but the down side is the resulting material is much softer than sand and cement so in high trafic areas it is not suitable. Also your ratio 4.1.1 seems to be a little strong to me you need to up the...
The problem with mixing screed is that if you put the water in the mixer as if you were mixing normal sand/cement, the mix tends to stick to inside of the mixer and it is quite hard to get the right consistancy so the pile of sand that is sitting patiently next to the mixer needs to be soaked...
I would always go for 3 sand to 1 cement mix , mixed semi dry ( just wet enough to form a snowball in your hands ) the easiest way I have found to mix my screed is to soak the sand first before mixing . try not to add water to the mix at all . and do not leave the stuff in the mixer to long or...
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