We have recently purchased a triaxial test instrument (MATEST) for testing different types of soil. After installing software, we are facing a issue of saturation where the samples does not saturate properly. We have applied various pressure (starting 50Kpa for soft sandy material ), but we couldn't get the B value which should be greater than 0.95. Could anyone help us to solve the issue?
Actually, for our process with the sand sample, to get B value > 0.95, you need to use the de-aired water to saturate. Applied the CO2 first to expel the air present in the pores, then injecting de-aired water by gravity. Backpressure is applied at 200 kPa to compress the air. If your sample still contains a high quantity of air, you can apply a negative pressure at the outlet to suck the air out. Be careful to not over-consolidated your sample. Good luck
Actually, for our process with the sand sample, to get B value > 0.95, you need to use the de-aired water to saturate. Applied the CO2 first to expel the air present in the pores, then injecting de-aired water by gravity. Backpressure is applied at 200 kPa to compress the air. If your sample still contains a high quantity of air, you can apply a negative pressure at the outlet to suck the air out. Be careful to not over-consolidated your sample. Good luck
Mr. Nguyen is quite right in his answrr. Moreover, manual of the triaxial testing machine should be studied.
Dear Hossain
I advice you to contact the manufacturer of the supplier of triaxial test instrument (MATEST) for assistance.
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