Abstract
In the previous report, the author reported that the height of a sand specimen is in direct proportion to the logarithm of a number of ramming, and furthermore if we take ε (=the gradient of the line/the height of a specimen which is given by first ramming=b/a)as a factor of contraction of a sand specimen by ramming, a and b are affected by the weight of a specimen but ε is not affected by that.
In this report, the effect of bentonite content and uniform sand grain size on the values of a, b and ε are studied.
a changes its value according to the sand grain size and bentonite content regularly.
The curves for b or ε-water content are similar in shape. In case of same bentonite content, the band ε do not change thier values so clear as the value of a according to the sand grain size, and especially when the bentonite content is 12 or 16%, the curves for b or ε-water content in different uniform-grain sand more approach each other. On the other hand, in case of same grain size, the more the bentonite is added the heigher the b or ε bcomes.
