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View Full Version : Need some insight on compacting a pad


toomuchtime
01-12-2010, 04:14 PM
alright guys I need some help here. For those that dont know cali grading plans are HUGE pain the ass lol. Here it go's the short version lol I had a large pad graded on MY land county says we moved to much dirt must provide minor grading plan and compaction report. We provide the compaction report enigneer does the grading plan. go threw all the thousend of dollars planting, irrigation,swell ditchs crazy erosion control contraptions required by state. to the tune of about 60k after all said and done on a PAD!!!! Think were done. NOPE.

My property had a small existing pad on it (a few acres away from the house) when we bought it. Its about 100 x 75 maybe a 4 foot cut and fill its been there for about 30 years i use it for parking trailer (not a structure) so on so on. Well the county is now saying they want a compaction test on it even though it was existing and I never plan to build on it. My engineer says it will not pass i gurantee it. So he wants it regraded and compacted to get us threw. Now my question. (Sorry for the long story). Im getting ready to purchase t300 for the property and some small side jobs ive never done a pad ( the other was done by excavtion company with a d4) is the t300 a big enough machine to do the job compaction wise. I REALLY dont want to have to get the d4 out here again lol. If the t300 will work how do you compact with a vibratory wheel or is there a better way. Sorry for my ignorance on the subject and THANKS A BUNCH FOR THE INPUT!!!!!

Scag48
01-12-2010, 04:46 PM
Cut the pad with your machine and get a roller, no big deal. That's a 1 day job if you take your sweet time, you should be able to buck enough dirt with that machine by lunch time to take an hour long lunch and less than an hour in the afternoon to roll it.

AWJ Services
01-12-2010, 08:17 PM
alright guys I need some help here. For those that dont know cali grading plans are HUGE pain the ass lol. Here it go's the short version lol I had a large pad graded on MY land county says we moved to much dirt must provide minor grading plan and compaction report. We provide the compaction report enigneer does the grading plan. go threw all the thousend of dollars planting, irrigation,swell ditchs crazy erosion control contraptions required by state. to the tune of about 60k after all said and done on a PAD!!!! Think were done. NOPE.

My property had a small existing pad on it (a few acres away from the house) when we bought it. Its about 100 x 75 maybe a 4 foot cut and fill its been there for about 30 years i use it for parking trailer (not a structure) so on so on. Well the county is now saying they want a compaction test on it even though it was existing and I never plan to build on it. My engineer says it will not pass i gurantee it. So he wants it regraded and compacted to get us threw. Now my question. (Sorry for the long story). Im getting ready to purchase t300 for the property and some small side jobs ive never done a pad ( the other was done by excavtion company with a d4) is the t300 a big enough machine to do the job compaction wise. I REALLY dont want to have to get the d4 out here again lol. If the t300 will work how do you compact with a vibratory wheel or is there a better way. Sorry for my ignorance on the subject and THANKS A BUNCH FOR THE INPUT!!!!!

What type soil is it?

93turbo
01-12-2010, 08:21 PM
buy the biggest trackhoe you can get and head to the state line and start digging a trench. As soon as it breaks off that will cure most of your problems LOL

Omran&Turbo
01-12-2010, 08:26 PM
Cut the pad with your machine and get a roller, no big deal. That's a 1 day job if you take your sweet time, you should be able to buck enough dirt with that machine by lunch time to take an hour long lunch and less than an hour in the afternoon to roll it.

I could not say it any better. agree 100% with scag48

toomuchtime
01-12-2010, 08:35 PM
Thank you guys for the help! That's What I wanted to hear! I'm pretty efficent
with the bobcat just never done compaction. But would love to learn.I'm not sure
on the soil type.Yes California is a pain in the ass!!!!!!!! Does any one have any
experince with bobcat vibratory roller?
Posted via Mobile Device

MOREDIRT
01-12-2010, 08:48 PM
Rent a BIG pad foot roller you might just be able to spend a day rolling around on it to get it to pass.

Fieldman12
01-12-2010, 11:52 PM
Hmm, I'm taking it he only has issues with the pad that has been there for 30 years. Granted I have not seen the soil that is there to know how it is but I dont see how after setting that long you gonna get it in any better shape. Anyway you could have a couple other professional opinions on this before going to all that trouble? I think I would have someone test that small piece first even if it is a different company before I go through all of that. You said it also is maybe a 4' cut and fill. I would assume all of the water does drain away fron it at least I hope. I really think you should get a professional excavators opinion. Not to knock an engineer but then again I think I would get someone that specializes in compaction first before I took his word. The stuff that is parked on it? How does it appear to be sitting as far as sinking goes?

bobcatuser
01-13-2010, 12:56 AM
Thank you guys for the help! That's What I wanted to hear! I'm pretty efficent
with the bobcat just never done compaction. But would love to learn.I'm not sure
on the soil type.Yes California is a pain in the ass!!!!!!!! Does any one have any
experince with bobcat vibratory roller?
Posted via Mobile Device

I have a Bobcat roller that gets used with my T320. The key to using the roller is to match the hydraulic flow from the machine to the roller.

Take a look at this thread it's all about compaction.

http://www.lawnsite.com/showthread.php?t=255780&highlight=bobcat+roller

toomuchtime
01-13-2010, 12:45 PM
Fieldman: my thoughts exactly. Im going to have a excavation company out today to see his thoughts.The problem with this is around here work is scarce and it is hard to find honest companys right now. If he says no it doesnt need re graded he doesnt get paid. The pad is COMPACTED no sinking hard as a rock. My enigneer on this project has been dead on throughout this process his suggestions have worked.From his stand point he is saying that long ago when it was originally graded were I live was just rural land and there is no way it is compacted correctly or they would have paid and got it certified as the house pad was.

bobcatuser is roller made by bobcat?

AWJ Services
01-13-2010, 08:20 PM
Hmm, I'm taking it he only has issues with the pad that has been there for 30 years. Granted I have not seen the soil that is there to know how it is but I dont see how after setting that long you gonna get it in any better shape. Anyway you could have a couple other professional opinions on this before going to all that trouble? I think I would have someone test that small piece first even if it is a different company before I go through all of that. You said it also is maybe a 4' cut and fill. I would assume all of the water does drain away fron it at least I hope. I really think you should get a professional excavators opinion. Not to knock an engineer but then again I think I would get someone that specializes in compaction first before I took his word. The stuff that is parked on it? How does it appear to be sitting as far as sinking goes?

Uncompacted soil will not compact over time. Parking on top of it will only compact the upper layer of soil. Maybe 12 inches down.
The only way to properly compact the soil is determined by the actual compaction needed as established by the engineer. Different soils compact differently, like sand for instance does not compact so unless someone has actual experience with area they cannot accurately instruct you on how to compact the soil.

Fieldman12
01-13-2010, 11:53 PM
Uncompacted soil will not compact over time. Parking on top of it will only compact the upper layer of soil. Maybe 12 inches down.
The only way to properly compact the soil is determined by the actual compaction needed as established by the engineer. Different soils compact differently, like sand for instance does not compact so unless someone has actual experience with area they cannot accurately instruct you on how to compact the soil.

Yes, I understand all that but around here at least for something like that it would be compacted in lifts. I guess I just have a hard time thinking someone would have done 4' of cut and fill and would have not compacted it as they went along especially since it was suppose to be for a pad in the first place. I agree it depends on the soil type like you and me mentioned.

bobcatuser
01-14-2010, 12:13 AM
Fieldman: my thoughts exactly. Im going to have a excavation company out today to see his thoughts.The problem with this is around here work is scarce and it is hard to find honest companys right now. If he says no it doesnt need re graded he doesnt get paid. The pad is COMPACTED no sinking hard as a rock. My enigneer on this project has been dead on throughout this process his suggestions have worked.From his stand point he is saying that long ago when it was originally graded were I live was just rural land and there is no way it is compacted correctly or they would have paid and got it certified as the house pad was.

bobcatuser is roller made by bobcat?

It has a bobcat S/N and the tag says Mexico. I don't know who makes it for them.

gammon landscaping
02-09-2010, 04:54 AM
i would just scratch it up a little and get a 433 cat and roll it all day and call for a inspect

bearmtnmartin
02-10-2010, 04:28 PM
Try shopping for a new engineer. Some of them don't even do the actual test. Maybe you can dig a hole and get it passed based on soil composition. Its all about ass covering , not compaction.

YellowDogSVC
02-10-2010, 09:53 PM
Thank you guys for the help! That's What I wanted to hear! I'm pretty efficent
with the bobcat just never done compaction. But would love to learn.I'm not sure
on the soil type.Yes California is a pain in the ass!!!!!!!! Does any one have any
experince with bobcat vibratory roller?
Posted via Mobile Device

I use a bobcat 48" roller. I have passed nuclear tests with it. I pack, crush, and roll base, caliche, dirt, and even gravel. It works good and with a little moisture, you will lock that material in. I prefer to roll in phases, that is, cut, fill, roll, then do it again so that each layer gets compacted but you can probably get enough vibration to get it down deep.
You might want to try a 72" roller and use it on a 26-30 gpm machine (I think they are high flow rollers). I use mine on 20-22 gpm, however, and it works fine.

curtisfarmer
02-10-2010, 10:12 PM
Where we live you can compact what ever you wnat to what ever compaction factor....but after 1 freeze thaw cycle, its back to what it was. Water expands 8% when frzen any gravel pad or road/drive expands up...thaws...and tight compaction is gone:(

toomuchtime
02-10-2010, 11:39 PM
Good info guys. We will be tackleing the job on saturday stay tuned for pics!

RHS
02-18-2010, 01:19 AM
If you want to go quick and dirty you could add some portland cement to the mix and essentially make a soil cement. A bit of water and compaction and you will have a pretty solid mixture. Just a thought if you are only looking to pass the test as cost effectively as possible.?????