Learn how to use the correct paddles for the Collomix xo6 mixer to create the best quality GFRC concrete countertop mix. For more information, see www.concretecou...
All mixers, no matter their design, will entrap air into the mix. GFRC needs to be mixed at a high velocity to help disperse the fine particles like pigments and cement. This is called high shear mixing, and it's essential to getting a consistent, high quality mix that maximizes the potential of the ingredients. A good mix design should not allow air to form foam that gets whipped up during mixing. Defoamers are used, either as admixtures or as part of the ingredients, to destabilize the foam whipped up during mixing and help the air bubbles escape. Only fluid mixes that are liquid allow air bubbles to rise on their own. Defoamers don't make air disappear. What they do is destabilize the foam that traps countless tiny bubbles and allows those tiny bubbles to coalesce into larger bubbles, which have more buoyant force. That lets them push up by buoyant force to escape the mix. So don't look at a mixer for entrapped air. Look instead at your mix. You may need to add a defoamer such as Fritz Pak's Air-Minus.
An earth auger is used for making holes in the ground, and as such it displaces the soil. I have never tried using it for mixing concrete in a hole in the ground, but I suspect it would simply throw out the concrete.
Another good video. I've taken a couple of your online classes and have used your live help feature a few times and I wanted to say thank you! I highly recommend them. ps: Any info on your bucket holder there in the video? From what I can tell it looks like a simple enough design (and beats trying to balance on top of full buckets as I mix)
Michael Risley Hi Michael, and thanks so much for the comments. I am so sorry it has taken me so long to see this - RU-vid was not sending me notifications of comments. The bucket maker is homemade, and as you can see it is very simple and effective!
The Collomix Xo6 mixer struggles with ECC, which is not the same as UHPC, but it might indicate there could be issues with UHPC as well. We have used it only for GFRC.
The Xo6 is more powerful to handle high shear mixing of GFRC. The Xo55 is also recommended. Please see concretecountertopinstitute.com/free-training/gfrc-equipment-for-concrete-countertops/
@@TheConcreteCountertopInstitute Thank you. Now you have me really looking at all their options. If you could please tell me what the difference is between the x055 old vs new vs 'r' that would be most appreciated. The 'old' model x055 seems to be selling for $100 USD cheaper right now.
hello. i have a question about mixing. what hppens when concrete be over mix. for example when i mix(silica sand-one part ' cement-one part ' superplasticizer-1% and water-25%) for three or four min its ok and self-leveling but when mix again the concrete changed from self-leveling to a fixed concrete. whats the reason?
It's hard to say without knowing water/cement ratio, superplasticizer chemistry, etc., but you could be overplasticizing the mix, and the sand is segregating and settling out into a dense layer.
@@TheConcreteCountertopInstitute w/c ratio 25% - superplasticizer tillman on-s 2000 powder (1%) and not segregating - when over mix concrete be puff(a little)- and be fixed in the bucket anyway i learned a lot from your website, and thank you very much, and studying it almost every day, one to two hours.god bless you
@@hamidrezar1040 Ah, yes, temperature has a significant effect on concrete curing times. Generally you should try to keep the ambient temperature above 50 degrees Fahrenheit and below 80 degrees.
