first dry mixed at the low speed of 60 r/min for 1 min in a mixer, after which the cement was added.
After the substances were uniformly mixed, water was finally added and the mixture obtained was mixed for another 2 min at 60 r/min.
The mixer was then stopped and material on the surface of the mixer was scraped down.
Finally, a 3 min mixing phase at 60 r/min rotation speed ended the mixing procedure.