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Old 10-09-2008, 07:33 AM   #16
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Can 1 chick demo a sidewalk with sledgehammer


Well as long as we a betting beer.

I'll give the following odds:

4:1 No rebar

2:1 No wire mesh

FOB: Jacksonville, FL

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Old 10-09-2008, 08:25 AM   #17
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Can 1 chick demo a sidewalk with sledgehammer


Naw, I bet there's no rebar, or wire mesh. How does one mail a beer????
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Old 10-09-2008, 08:57 AM   #18
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Can 1 chick demo a sidewalk with sledgehammer


seems odd to me that in the safety conscious atmosphere here that only micromind mentioned the use of safety glasses.
hammer+concrete=100mph+ debris.

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Old 10-09-2008, 11:35 AM   #19
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Can 1 chick demo a sidewalk with sledgehammer


Now thats a little unfair. When I was reading the thread, I was going to mention that when I made my post, but someone beat me to it
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Old 10-09-2008, 10:02 PM   #20
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Can 1 chick demo a sidewalk with sledgehammer


ya, i did a lot of jack hammering last month for the first time in my life. what i learned (the hard way) was repeated by the good posts above.

let me reiterate some tips (hopefully there's a new one for you)
- do yourself a favour and rent an electric jack hammer. it comes with 2 types of bits usually, a dart shapped one and a flat head shapped (not sure which is best for your project).

- ask tool rental company to demonstrate how to change the bits, it is a bit tricky to learn otherwise!

- the jack hammer is HEAVY when not in operation. i was using it on a stone portch and the tip of it slipped off the edge and nearlly took me with it!!

- if the jack hammer falls over, or falls just LET IT GO.. its built tough, it can handle it (your back can not).

- when the jack hammer is in motion, it sort of glides on the surface as if it ways very little

- when you STOP hammering, be aware that the machine will "suddenly" gain 100lbs... so make sure it is standing perfectly upright before you turn it off

- get a 6' iron pry bar.. this helps a LOT! you can rent them from home depot (i had one handy and couldn't have removed my stone porch without it).

if you are jack hammering a particularily thick piece, like more than 12", then it is usually a good idea to undermine the stone. i.e. chip away its belly or side to create a cavity, and then put jack hammer directly on top and go straight down.

make sure you pull the jack hammer out a bit.. or the spade will get stuck in the stone/cement. like, if you are hammering down straight and you can't see the tip of the blade anymore, give a pull straight up and then let it drop back into the hole and keep going. if you can pull it out like this, then it is not stuck. the deeper you go, the more you risk the jack hammer gets stuck in the cement, very hard to get out!

waste disposal for concrete is fairly cheap (it is recycled as "clean fill"). find a dedicated place for stone/concrete and you're looking at $30 per tonne... otherwise you dispose of it at the city landfil and it will cost you easly twice as much.

wear safety glasses! flying concrete chips go everwhere.

wear safety shoes - you'll eventually try to jack hammer your toes, trust me

post some pics of your project & good luck

Knucklez

Last edited by Knucklez; 10-09-2008 at 10:05 PM.
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Old 10-10-2008, 07:41 AM   #21
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Can 1 chick demo a sidewalk with sledgehammer


Quote:
Originally Posted by Knucklez View Post
wear safety shoes - you'll eventually try to jack hammer your toes, trust me

Knucklez
wow, i've heard of "hammer-toed" but...... lol

ya know, she's probly all done and forgot us here.... never get to see all our pithy responses. =o/

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Old 10-10-2008, 01:54 PM   #22
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Can 1 chick demo a sidewalk with sledgehammer


The easy way to do it from what I've read is to use an "expansive cracking agent" such as Bristar or Dexpan. Chemicals are mixed with water and poured into 1-1/2" - 2" holes drilled with a rotary hammer. Over 24 hrs. the stuff expands with about 18,000 lb.per sq. in. of force and turns the slab into pieces you can handle. If the slab is connected to the house, you have to be careful not to break your foundation though. I'm guessing all this, with renting a rotary hammer and buying the chemical, would be more than the $100 quote (no idea what the chemical costs, but I'm guessing not cheap). I'd sure like to see it done some day though. Best of luck however you go about it!
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Old 10-10-2008, 05:58 PM   #23
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Can 1 chick demo a sidewalk with sledgehammer


I worked with bristar, maybe 15yrs ago, great stuff, as long as you know how to mix it. I'm still voting for the electric hammer, although I know full well that air hammer would do quite nicely. Slamming that sledge down on the concrete is going to be like someone already mentioned, pounding the soil under it. If going with the hammer, be better to use a chisel with it, get the full effect. As for disposal, as someone mentioned, I paid $84 a ton at the local landfill/transfer station, next town over, clean rubble was at $40 a ton, I used local to save time and fuel, mostly the time was needed. This will turn into one of those times where we can all pull up a chair and watch the show.
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Old 10-10-2008, 07:01 PM   #24
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Can 1 chick demo a sidewalk with sledgehammer


Yeah, I mentioned the expanding stuff kind of "tongue in cheek"...... sounds neat, but I'm sure in the wrong hands (mine perhaps) it could be a clusterbang! I'd like to see it work some time though.
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Old 10-23-2008, 01:08 AM   #25
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Can 1 chick demo a sidewalk with sledgehammer


pry it up make it hollow under place a wedge smack it to crack it place braker pry bar in crack and lift smack it crack it and yes it is not hard to break if you do not have wire in the mix
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Old 10-23-2008, 04:28 AM   #26
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Can 1 chick demo a sidewalk with sledgehammer


now we know wire's REAL purpose - to hold cracked pieces of conc together

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