Research Information System
7th Geochemistry Symposium with International Participation, Antalya, Turkey, 16 - 18 May 2016, vol.1, no.1, pp.164, (Summary Text)
EFFECT ON MINERALOGY, STRUCTURE AND ITS STRENGTH PROPERTIES OF CLAYS OF WATERS WITH DIFFERENT CHEMICAL COMPOSITION
Davut Laçin1, Levent Kuş2 ve Ali Malik Gözübol2
Abstract: Clays can constitute a problem for a variety of engineering structures in its natural environments, and interact with water under different environmental conditions with different chemical compositions with their environments. These effects, depending on the water chemistry, cause an alteration of the structure of clay and affect the strength of the clay.In this study, it were examined changes that may occur in angle of internal friction and in cohesion values in case of exposure pure water carbonated water, lime water and sea water in different water contents, in natural environments of clay. For this purpose, it have been studied clays of the Upper Oligocene - Lower Miocene aged Danişmen formation in the Doğanköy region (Tekirdağ) and the same aged Haramidere (İstanbul) Gurpinar Formation clays. It have been shown that different water types have been bring about different effects on studied clay samples as a result of experiments. Seawater led to an increase in strength of both Gurpınar formation and Danişmen formation clays at the end of curing period. Lime-bearing water contains plenty of high-valent ions and thereby increases the resistance by integrating with structure of the clay and hence was seen as strength enhancers in both formations. Cutting box, release pressure and viscosity limits experiments were made on the clay samples. Carbonated water has a little low value in shear box test, but has relatively high values in free pressure test. According to the data obtained from shear box experiments, Internal friction and cohesion values of Danişmen formation and Gürpınar formation was different from each other at the same water content. Unconfined compressive strength of the samples of both formation yielded different results. Different samples have shown different resistance characteristics for each water and type of consistency has also given different results from each other.The reason of this discrepancyis that the combination of clay is different in the two regions.
Keywords: Clay, shear box test, lime-bearing water, seawater