Who has the best set up and why would love to here some input have a small jaw works but slow????????????????
small operations not the big boys
We run an Eagle plant.Small,no,still portable.Jaws are fine if you're not concerened about making a spec product and just want to crush down to a useable size.In my opinion,a closed circuit,horizontal impactor is the way to go if you are looking to produce a marketable product.
Most here run a jaw into a secondary to make a finished product. If you have more time, and are still concerned about big pieces, a hammer, and or a concrete processor on an excavator will get you a lot smaller product to run through a smaller crusher. I know several demolition companies that will use a concrete processor to "crush" their concrete, and then they will track across it once more to further reduce the big chunks left over.
That's how we do it, a LaBounty processor to handle large slabs/chunks,works great.
We use a combination of a Lippmann 30x62 Jaw and then a Hazemag APPH1515 with a 7x20 screen deck. Good production and can setup in 6 hours.
Lol,,, I'd say good production.... prolly 350 to 400 ton and hour?
So they rate concrete in psi right? Like 2500 psi to like 4000 psi, or something like that. Is that relevant to the breaking strength? The rock I am crushing daily is anywhere from 29k psi to 40k psi compressive strength. If I'm thinking along the right lines, that would make concrete much easier to crush than my material. Is this a correct assumption or what?
Thats right,with concrete,you're not really 'crushing' the limestone aggregate,rather,separating it from the sand,cement that bind it together.Reducing the size of the concrete pieces is really what you're doing.Crushing pure limestone is kind of different,but sort of the same.Hope that makes sense.
It all depends on how clean (rebar and wire) the concrete is that you are crushing for production. We crush shot limestone also with a Hazemag HSI. The production in limestone is almost twice that of crushing concrete. Crushing concrete you are lucking to keep running more than an hour without some type of problem like tearing belts, getting plugged up etc. A rock crushing crew trying for the first time recycling will quickly realize that crushing rock is much easier. When selecting a crusher for concrete recycling size does matter! Don't ever let a dealer talk you into a small track crusher if you have any rebar or wire in the concrete. The first time you tie a rope around your ankles and slide down the discharge conveyor belt to cut rebar you will know what I'm talking about.
Thanks for the info, I have ran impactors for recycling just couldnt afford what we wanted so we bought A small eagle 15X36. We are installing a huge magnet now hope to get at least 50 to 60 tons an hour for awhile just to get started.We have a muncher to process material and luckily rented a yard with a couple hundred tons already processed. Has any one ever used a small jaw like ours for sizing behind a larger jaw or are we wasting our time with a small jaw as a secoundary thanks in advance
Hi Kevink. I am getting more and more concrete demo work and managing the waste is always a challenge and maybe opportunity. I have been looking into concrete recycling also. Is your new setup portable? If so what is your setup time/cost? What equipment r u loading/ managing material with? How many men and machines does it take to reach your 50 tph? Thxs
How did you get your set up time down to 6 hours? I have an eagle 1400 and our set up time is about 12 and i am looking for ways to reduce it if i can.
Well Setup is a day burned and usually ties up a loader and excavator,cost havent put a pencil to it.We load with a rubber tire loader and are feeding it 10 to 20 inch minus concrete which takes awhile to prepare.But the upside is with 20inch minus I run the machine myself and have good luck.We are still working the bugs out but makes 2 in minus roadbase easy and burns no fuel on the crusher it has a small 5.9 cummins for power so great on fuel. Its small but dont have a fortune tied up in it so running it everyday is optional.
Is anyone getting a gradation that will meet specs for road gravel out of crushed concrete?
Hello. My bosses says our crushed concrete has passed three engineer's test/review for "A" and "B" gravel in Southern Ontario.
Who are the main end-users of Recycled concrete? Never knew anything could be done with it.
It's gravel. You can use it most places you'd use natural stone.
Feel a bit silly now! I suppose thought it would deteriorate into dust. Cheers
Depends on its final use. Some say if it is exposed to weather, ie gravel drive/road, weather does deteriorate it. Around us it is used a lot because we dont have much stone here. If we get limestone its been carried from a good distance away via a lake freighter. We do have natural/river gravel mixed with sand as road base. In most cases the crushed concrete gives a better end product. Another use would be crushing and using as a replacement for new aggregates in concrete. I know there are some out there messing around with that portion with good results. It does make sense to me for that use as well. You just need to know your end use, and use the proper product to meet your expectations.
I did in Virginia, useing a Extec Impactor
Setting up a Concrete/Asphalt recycle yard and was curious if anyone on here has utilized "chunkers or grizzly's" to help pre-screen material to help minimize time sorting it all out with trackhoe and loaders. my thoughts are to build your typical ramp and build a large chunker at the top for the dump trucks to dump over it when dropping off material. this would leave me a clean pile of larger chunks and a dirty pile with say an 8" minus. i think the 8" minus pile would be good for your subbase material or roadstones and the larger cleaner pile would be easier to meet gradation on certain products. Any Thoughts???/
Here's my dad's set-up at one of the crushing jobs. https://farm9.staticflickr.com/8150/7331744720_25eeee00a5.jpg
Welcome to the Forums JBirse!:drinkup