Abstract
The study describes investigations of the stress a in function of a relative displacement eta for the modified and non-modified epoxy binders. It has been stated that an addition of the modifier affects the run of function rho = f(eta) and the value of a breaking stress. Small additions of the modifier (or its total absence) give the function typical of brittle materials, while large additions of the modifier result in an opposite situation, which means that the function is running in a mode typical of plastic bodies with an obvious elongation of the specimen. The results obtained for different runs of function rho = f(eta) and for different values of the breaking stresses resulting there from were verified on sands hardened with epoxy binder.
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