According to the manufacturer, I ought to pour the fibers in the water, but is there any specific order in the mix procedure for adding the cement, sand and superplasticizer?
Your best bet is to first dry mix the sand and cement for about 1 minute, then add all the superplasticizer in 50% of the water. Add the water with superplasticizer to the dry mix and mix for about 2 minutes. Add the remaining water and mix for an additional 1 minute. Then slowly use hand to disperse the fiber into the mixture while the mixing is going on