I am working on the shear strength parameter of Kaolin-Bentonite mixture. I used undrained direct shear test in order to get Cu for the mixture.
My result shows that there isnt a significant difference between undrained cohesion of mixture which has greater percentage of kaolin in comparison with the one that has a greater percentage of Bentonite.
Does anyone one has experience about shear strength parameter of kaolin and bentonite which is obtained by direct shear test ?
at equal water contents the yield strength and Cu of bentonite is absolutely higher than kaolinite because of its higher activity
Dear Mr. Ogbonnaya Igwe
Thank you so much for your cooperation.
Actually, I make mixtures with different percentage of Kaolin-Bentonite with water content of equal to liquid limit and after that I consolidated mixture with normal stress of 200 kpa, then the mixture is ready to shear. So, the mixture before the test has different water content and now I wanna to have a conclusion about shear strength of this mixture but my result shows that ther isnt a specific difference between them. Also there is a range of 20 to 30 kpa for cu of my mixtures.
I will be pleased if you do me a favor of sharing any information about it.
I have tested samples with kaolinite mixed with fine sand and bentonite mixed with fine sand, for different clay fractions, with a rheometer, at IC = -0.8. The yield stress of the samples with bentonite are considerable lower than with kaolinite. 100% bentonite had the lowest values of yield stress and 30% of kaolinite (lowest fraction I tested), had the highest.
Daniela Garroux G. de Oliveira
Thank you so much for your cooperation.