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Thanks BigH. Those articles were very useful. I was just concerned that there are other forces rather than what is described in Janssen's and a couple of the papers looked deeper into the forces. aeolian: Those are the weights I am looking at, however, the grain weight directly above the...

Here's my question: I am working on the settlement of a proposed grain bin which has appx 6' stemwalls, 4' wide footing at base of stemwalls whereas the footing is exposed on the outside of the stemwalls but the inside of the stemwalls is backfilled with granular material to 6" below the top of...

I was asked to figure the piled density of some crushed concrete for a job I am working on. I recieved a sample and it is very clean and is about 2" to 3" pieces. I notice alot of brick mixed in. Using a pot of known density and lightly dumping the sample in the pot I ended up with a density of...

Well I wasn't expecting a rate less that 1x10^-9 based on past tests on similar soils. I am letting the sample sit for an extra week to see what happens. I predict it at more of 1x10^-8 or faster. I should probably start looking at constant head. Thanks.

So I am running falling head perms on both remolded and shelby tube samples and I notice that mainly in some shelby tube samples after about a 5 days soak period and when i begin taking readings there is an occation that a sample may not drop. Even after an entire day it does not drop even 1...

I am using 13.5 feet head for my sample to saturate it. The samples are typically for lagoon liners and require as close to 100% saturation as possible. I see where you are getting to and I agree. So basically what you are saying is that there is no way to determine time to saturation? It sounds...

Ok, here's a new question that I'm sure will have alot of different answers. I am running falling head perms using a compaction mold. How do you judge times that it takes to saturate a recompacted sample? Is there a time of saturation calculation that I can use or do I just have to follow the...

All right, I had 3 percent as well. My contact had 1.5 percent but I'm unsure how he got that and wanted to check since he has been in the business for much longer. Fattdad, when you talk about optimum moisture at 95% compaction I am not sure how this applies to this exact test. The contractor...

Ok, here's a fairly simple one. I have a contractor looking for us to run a proctor, perm, hydrometer, atterberg limits test on a sample of silt with a mix of bentonite for a liner material. The contractor wants to add 1.5 lbs of bentonite per square foot of surface area (6" lift) in the field...

wannabeEIT: That wouldn't work in this case because I need a specific amount of soil in the mold and if I compact it as a standard Proctor I will never acheive my 95% compaction. The 25 blows per layer will densify it much further than the 8-12 that I currently need. I have come to the...

I have a simple question that I hope someone could answer. What method do you use to compact the material in the mold to acheive 95%? Obviously you need a specific amount of soil in the constant mold volume to produce a density. I calculate the amount of soil needed and place it in three lifts...

I actually created a vacuum using a standard air hose and sucked the water up the hose which worked well. I'm not sure if I want to use a larger hose because my compaction mold only has a fitting on it the size that fits the hose (1/8") and that is what the manufacturer supplied. I also have 13...

Thanks, I'll have to buy that copy because unfortunately we don't have that one. I did find in the gINT help what to enter in that field although it took some searching. Correct me if I'm wrong but from what I understand from reading old notes from college is that I have to take two temperature...

Here is my question. I need to add a 151H to the list of hydrometers it appears because the only hydrometer on their list is a 152H. When I go into Data Design:Library Tables to setup a new hydrometer it asks for calibration intercept and calibration slope. Any help on what those are or where to...

Has anyone used gINT software to report a hydrometer analysis? I am having a question on the hydrometer calibration function.

It does seem that after some use the problem with the entrapped air in the line does decrease, probably due to the flushing of the lines. I learned that you need to carefully add the water so that you minimize the chance that you entrap air. It took a little thinking over the weekend and it...

Can anyone help me with a problem I have been having with my falling-head perm test that I am trying to set up? I am using a compaction mold which uses a 3/8" O.D. 1/4" I.D. clear pastic hose to create the head. What I am trying to do is keep the air out of my system. It seems as if the plastic...