Grain Size Distribution Grain Size Distribution SargeMix (Civil/Environmental) (OP) 27 Apr 15 21:07 I have obtained soil samples 2m below a swamp. How do i go about grain size analysis? RE: Grain Size Distribution BigH (Geotechnical) 28 Apr 15 06:39 Are the samples paludal or underlyging lacustrine? I really don't know how to respond to this one . . . RE: Grain Size Distribution cvg (Civil/Environmental) 28 Apr 15 19:46 first of all, the geotechnical engineer should be collecting the samples and suggesting means or methods of analyzing them. RE: Grain Size Distribution SargeMix (Civil/Environmental) (OP) 29 Apr 15 13:43 I've been able to conduct a moisture content analysis. My question is this.... the soil sample is wet, how do I go about grain size distribution analysis? RE: Grain Size Distribution oldestguy (Geotechnical) 29 Apr 15 18:24 Your question of doing this yourself would mean that you need the tools for doing the tests. Usually the sample has to be dried first. A typical soils laboratory has, among other things: oven, small containers, good precision scales, sieves of varying size openings, dispersion chemical, standard model dispersion machine, Hydrometer and cylinder, instruction manual. A wet sample may have to be used that way with hydrometer test to avoid the effect of drying, but also sieves may be needed for a dry sample. If you are not so equipped or have not been so trained, send the samples to someone that does, as recommended above. This is really just doing standard tests. RE: Grain Size Distribution BigH (Geotechnical) 30 Apr 15 01:19 First off, really, all, the OP should go find himself an elementary text on soil mechanics and read - typically chapter 1 or 2, about soils, their properties and how to measure. I found myself scratching my head in that the OP knows there is such a thing as a particle size distribution but can't figure out how to do it? What he has not noted is whether the material is a clay or sand - but it might be amorphous peat or fibrous peat in which case the particle size distibution is rather dubious to begin with. RE: Grain Size Distribution Ron (Structural) 30 Apr 15 03:43 As BigH noted, get a soils lab book...Lambe and Whitman, Bowles, etc. Read ASTM D422 and follow the procedure. You will need a full nest of sieves, a mechanical sieve shaker, a wash-200 sieve, an oven and a scale accurate to at least 0.01g with a range of up to about 1500g. Better than that....pay a local geotechnical lab to do the test at a nominal fee (less than $100) and you'll get a grain size distribution curve and other classification info. You'll spend more than $100 just thinking about it! A hint....you start with an oven dried sample. RE: Grain Size Distribution SargeMix (Civil/Environmental) (OP) 4 May 15 10:21 Thanks y'all. Already did it. RE: Grain Size Distribution fattdad (Geotechnical) 4 May 15 16:40 astm d-422 f-d ípapß gordo ainÆt no madre flaca! RE: Grain Size Distribution BigH (Geotechnical) 7 May 15 07:04 Lambe, 1951 RE: Grain Size Distribution Usmi09 (Geotechnical) 25 May 15 13:35 I would like to say. Determine Moisture content and then follow the Procedure ASTM D422 if there is more silt or Clay you head to Atterburg Limits to know the soil classification properly.