weight of concrete

[JB4310]

I left about 8-10 gallons out of the 190 litre barrel for the same thing. I'll try to take some pictures tomorrow and post them.

So an 80 pound bag of readi-mix, mixed, should weigh 100# +/- a few when dried. How many cubic feet does a gallon of liquid take up?

thanks to all.....
CB

7.5 gallons per cubic foot, so 1/7.5 = 0.13 cubic feet per gallon.

JB

 

[orezok]

I left about 8-10 gallons out of the 190 litre barrel for the same thing. I'll try to take some pictures tomorrow and post them.

So an 80 pound bag of readi-mix, mixed, should weigh 100# +/- a few when dried. How many cubic feet does a gallon of liquid take up?

thanks to all.....
CB

A gallon of water (or whatever) is 231 CI or about .1336 CF

 

[lostcause]

i'm basing these rough numbers on the aisc 9th edition (it was already on the desk & i didn't want to go find a newer manual) published in 1989.

page 4-5, allowable shear load:

Fv = 0.22(Fu)(A), where Fv is the shear strength of the rod and Fu is the ultimate tensile strength of the base metal, and A is the area of the bar.

if it is cold rolled a1018, then the ultimate strength is 63.8 ksi. if it is hot rolled a36, then the ultimate strength is likely 58 ksi. i only add the "ifs" because in my experience most steel is hot rolled. you can often buy cold rolled at local hardware and home centers, but most steel supply centers that sell angles, plates, channels etc will be selling hot rolled unless you specify otherwise.

Fv = 0.22(63.8ksi)(0.4418 in^2) = 6.2 k = 6,200 lb per pin for a1018 cold rolled.

those numbers, and any other calculated ones are for statically loaded conditions, meaning pinned together and not moved afterward. we all know that tractors bounce around so you can guarantee that there will be some extra forces from impact loading, and also some bending forces if the lift arms are not tight to the weight block.

 

[Chain Bender]

i

if it is cold rolled a1018, then the ultimate strength is 63.8 ksi. if it is hot rolled a36, then the ultimate strength is likely 58 ksi. i only add the "ifs" because in my experience most steel is hot rolled. you can often buy cold rolled at local hardware and home centers, but most steel supply centers that sell angles, plates, channels etc will be selling hot rolled unless you specify otherwise.

Fv = 0.22(63.8ksi)(0.4418 in^2) = 6.2 k = 6,200 lb per pin for a1018 cold rolled.

those numbers, and any other calculated ones are for statically loaded conditions, meaning pinned together and not moved afterward. we all know that tractors bounce around so you can guarantee that there will be some extra forces from impact loading, and also some bending forces if the lift arms are not tight to the weight block.

XXXXXXXXXXX

It is cold rolled. I asked for standard 3/4" round stock but they were out. I live 45 miles from the steel shed so I went ahead and paid the $34 I think it was so I wouldn't have to go back later and could get on with the project. I also had plans for the remainder of the 10' stick.


I'm thinking it is going to be closer to 800# than 700# since I got the numbers to calulate with. How long should I let a 50 gallon barrel with 42 gallons of concrete dry? The temps have been any where from 30 to 60 yesterday and today and probably the same for teh next several days. I'd hate to go through all the trouble of making the thing and fracture it trying to get it out from under the barn.

Thanks for the input.

CB

 

[pfatz]

Since my Kubota cannot put down force on my 3 point I wanted weight on my Box Blade. I used some 3x2x3/16 Angle I had on hand and framed for 16x16x4 Concrete Cap Blocks on each side . 2 Blocks are @ 175# if I remember right. Four blocks seemed a bit much tho the Bota did not have a problem.





3 Pt Hauler, Box Blade & Trlr Toter could have been made reversible w/ GN Ball on top & also with a socket on bottom to use different Hitch Inserts.

 

[srs]

Today I made a balast weight for my L3200. I used 7 1/2 80# bags of ready to use concrete mix. I figure I added about 2+ gallons of water to each bag.

NOW......here's the question. How much weight will a gallon of water add to the concrete when it has dried.
CB

I had the same question regarding an 80 lb. bag of Sakrete Concrete mix. I sent them an email and they replied 88 lbs. Real close what JB4310 said too.

 

[sparc]

I tried to find a simple link that could explain it but couldn't.

Not a single link but there is much here.

Concrete - Wikipedia, the free encyclopedia

ACI - American Concrete Institute

 

[LD1]

Total weight will probabally be ~900lbs

Cured concrete weighs 150lb/cuft

80lb bags are typically 2/3 cu/ft

So you have with 7.5bags, you have 5 cu-ft

So that is 750 of concrete +~100lbs of chunks, + barrel + steel =~900lbs.

Hard to narrow down anymore and it is really pointless. What you have is enough weight for ballast and well within the lift cap.

As to the pins, they are just fine. Personally, I would have used the 7/8". But not for strength, but because they will fit tighter and wouldnt wear out the ball ends as quick due to the slop.

But look at all the heavy cat 1 3PH implements that see WAY more than 900lbs force and only have 7/8" pins. Like plows, rear blades, or any ground engaging implement. Those can easially see 2500lbs+ because you tractor can generate a LOT of tractive force.

So there ya go. Pins are fine, and about 900lbs

 

[Gary Fowler]

I would give the concrete at least 7 days to cure before moving it around. At 30F the hydration slows to almost nothing with just the heat of hydration to keep it from freezing. When above 40F, concrete will reach 70-80% of its strength in 7 days. 28 days cure @70F with concrete sample in a water bath is what is used to test concrete for compressive strength to verify that it will meet the design requirements. This gives the optimum conditions and field poured concrete may not be of the same strength. The warmer you can keep it, the better it will cure.

 

[Chain Bender]

I would give the concrete at least 7 days to cure before moving it around. At 30F the hydration slows to almost nothing with just the heat of hydration to keep it from freezing. When above 40F, concrete will reach 70-80% of its strength in 7 days. 28 days cure @70F with concrete sample in a water bath is what is used to test concrete for compressive strength to verify that it will meet the design requirements. This gives the optimum conditions and field poured concrete may not be of the same strength. The warmer you can keep it, the better it will cure.

I had to move it at the 3 day mark. It was just in my way. I didn't plan well ahead. My shop floor was the only place I had that was flat and the barrel wouldn't get rained in. I lifted genly and didn't bump it at all when I set it down. Need to finsh up the 3/4" lift pins/rod today and get it ready for log work.

Thanks again to all who have had informative input.
CB