The correlation is not too great. We were not asked to do an ovendry density. But we weight and get 2 diameters of every specimen we break. So I know a nominal Wet Density assuming a 12" heigh specimen.
I started to break some 56 day samples and there was virtually no increase from 28 days.
I...
We are testing concrete for a project that requires 3500 psi lightweight concrete. We are not casting the samples, just picking up, lab curing and breaking. Our Coefficient of Variation for all other concrete on this job ranging from 2500 to 8000 psi is from 1.4 to 2.6 for which <3.0 is the...
I am performing a CU test on Flyash and am having problems achieving B-parameter saturation. Due to the consolidation pressures I can not increase the back pressure and cell pressures further. I am reading only about 80% B value. What are the procedures for CO2 saturation? I have a tank of 25%...
I have worked in a geotechnical laboratory atmosphere for over 17 years. I do have mild asthma but the dust has never really bothered me. I recently purchased a Surface Grinder to grind flat rock core specimens. I have a shop
vac attached to the grinding wheel housing to collect the majority...
Let me clarify. I oven dry my 1L of sample AFTER the test. I start with -#10 air dried material but I don't record the weight because I get it after the test is complete. I wash my 16h soaked air dried sample over a #200 sieve and transfer that material, which includes the defloc. solution to...
The simple solution is to oven dry the entire sample AFTER the hydrometer test is complete.
This will give you the wt of dry soil used in the test directly (after subtracting out 5 grams for the defloc.). Then there is no assuming the Hygroscopic MC correction.
We have run our Hydrometer...
