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Dear all, Anybody knows the most reliable method (sensor or any othe means) for measuring relative humidity or water activity. I have used some methods (sensors) but they deviate quite alot from the actual values. Thanks for your attention. Best regards Agus S.

Dear all, Does anybody know how to calculate energy per unit volume of soil induced in standard proctor compaction test. I know the amount of the energy but could not find out how to get that number. I need this information as I am compacting my soils using different number of blows, number of...

Dear all, Does anybody know how to calculate energy per unit volume of soil induced in standard proctor compaction test. I know the amount of the energy but could not find out how to get that number. I need this information as I am compacting my soils using different number of blows, number of...

I am dealing with expansive clays. Does any body know how to dry compacted expansive clays without changing their porosity? Thanks for your suggestions. Regards, Agus

Dear Alai, In unsaturated soil mechanics, there are two stress state variables, namely, net normal stress which is defined as sigma-ua, and suction (or matric suction) defined as ua-uw, instead of one stress state variable (i.e., effective stress), as you have mentioned. That is right that...

Dear Ashayeri, Thanks for the file. However, it still could not run as it requires database with extension cpd. I have downloaded all databases that you provide in your website, nevertheless, they have extension dat not cpd. Therefore, I cannot run the program. I have a problem that I have to...

Dear Dr. Ashayeri, Thanks so much for your guidance. I visited your website but I could not download the ClayPredict software you have. Is there any possibility that I could get it from you. Thanks for your attention and help. Best regards Agus S. Samingan email...

Dear all, Would anyone inform me how I can estimate the optimum water content of a soil for compaction test from its plastic limit and liquid limit. I had ever done the test long time ago when I was in undergrad school. However, I only knew that the optimum water content was estimated from its...

Dear all, Would anyone inform me how I can estimate the optimum water content of a soil for compaction test from its plastic limit and liquid limit. I had ever done the test long time ago when I was in undergrad school. However, I only knew that the optimum water content was estimated from its...

Dear Guest101, I was involved some in researches on peat long time ago. Unfortunately, I do not have the publications about that with me now. Perhaps you can contact Prof. Budi Susilo Soepandji at the University of Indonesia. He definitely has results from the UU and CU tests on peats. Just...

Dear all, I am from Germany doing research on expansive soils. Some terms, such as coefficient of permeability, really has some doubts in its definition. As Darcy's law described that coefficient of permeability should be referred to water in its free form, i.e., those that fill the macropores...

I do not need to measure the osmotic suction at all. What I am going to do is to apply suction (i.e., total suction) by using the vapour equilibrium technique. To confirm the magnitude of the suction applied an accurate relative humidity sensor with temperature measurement will be used. Thus...

Dear all, I am desperately looking for a sensor which is able to measure both relative humidity and temperature at the same time. It has to have accuracy of 0.1 oC for temperature measurement and 0.1% for relative humidity measurement. There are so many sensors available but I have not found...

Hi....Currently I am doing vapor equilibrium technique for applying suction to soils. Does anybody know solutions to be used and their ranges of suction applied? Thanks so much....!!! Discussion on other topics is welcome.

Hi....Currently I am doing vapor equilibrium technique for applying suction to soils. Does anybody know solutions to be used and their ranges of suction applied? Thanks so much....!!! Discussion on other topics is welcome.

Hi all, Is anybody from unsaturated soil group. I have been involved in this group for long time. Lets make discussion on it.