Showing papers by "Amirkabir University of Technology published in 1975"

Composition and compressibility of typical samples of Mexico City clay

Abstract: Composition and compressibility characteristics of Mexico City clay were investigated using samples with natural water contents in the range of 421–574%. The composition study included scanning electron microscopy, X-ray diffraction and chemical analyses, as well as measurements of physical properties. Compressibility characteristics were investigated by means of one-dimensional consolidation tests run on specimens in the following states: natural undisturbed, artificially sedimented, remoulded at natural water content, remoulded-aged, and hydrogen peroxide treated. The primary objective was to study the secondary compressibility of Mexico City clay with special reference to the effects of previous secondary compression and thixotropic hardening. Compositional analysis indicated 5–10% sand-sized particles, most of which are calcareous ooliths (the remainder of this size fraction is a suite of heavy minerals); 55–65% of the whole sample is composed of silt-sized siliceous microfossils, mostly diatoms; 20–3...