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I am by no means an expert, but I think OSHA has requirements on this. I think you need to create negative pressure in the room so no dust gets out--by having a strong fan blowing to the outdoors.
On the other hand, I was at Walmart late at night five years back and they were leveling an old concrete floor using some sort of spinning scaping machine. They just had that section roped off. So I guess they weren't worried!
Like others mentioned, we've focused on source control. We have an OmniAire 2200C with a snorkel attached to it that we put near anything making dust. Before turning on the cement mixer we have an elastic corded plastic cover that goes over the drum opening.
For the power tools we use on concrete samples we follow OSHA
29 CFR 1926.1153
and use an OSHA compliant HEPA vacuum. I haven't tried to deal with the foot prints out of the room yet but I'm considering putting down some of the disposable sticky floor mats used in clean rooms, lead abatement projects, etc.
Engineering Lab Manager
School of Engineering
One thing that will help is to hold a large piece of 1/4" plywood or similar material tight over the opening of the mixer until the concrete is hydrated. The less dust leaving the mixer the better. Also as has already been said, avoid pouring the dry concrete
into the mixer.
Penn State University
I’ve been waiting to get a Pulsbac vacuum from Pulsbac.com. It is a similar system to what the Zcorp or 3DS 450 has for filtering powder. Almost eliminates
filter changes. I would look into one of those, but they do have a hefty price tag.
Rensselaer School of Architecture
Thanks Michael. I agree that capturing it at the source seems better than trying to deal with it after it spreads into the room. You have a central dust collection system, which I wish we had, but don't. I am doubtful that we can get permission to exhaust
to the outside, so we have been looking at filtering systems. The problem there is that it looks like we might be going through a lot of expensive filters.
On 1/14/2021 2:09 PM, Michael Gillhouse via groups.io wrote:
We just have students use a vacuum hose or dust collection hose coming off the main system over the mixer while we pour. Humidifiers and/or spray bottles can mitigate small batch problems but sucking up the dust as it is produced seems
to work best. Pulling the bag off the cement instead of pouring it produces less dust too.
We are planning to do quite a bit of work with concrete and are concerned about the dust. Our lab is about 1400 square feet, but in the past, the dust has spilled out into a lot of the rest of the building which has made quite a few people unhappy. Most of
the dust will be created by a portable mixer that will move to different locations in the lab. I was wondering if others had come up with solutions to similar dust problems, whether concrete, plaster, or like materials?
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