Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Compressibility and Strength Properties of Clays Subjected to Leachate and Acidic Solutions

In this study, during clay’s exposure to leachate and acidic solutions, its compressibility – deformation behaviour, strength and micro structure have been analysed. For this purpose, following tests have been carried out on used clays and samples; consistency limits, specific density, sieve and hydrometer, compaction, consolidation, shear box, unconfined compression. At the end of the tests, it is observed that leachate has affected the clays’ behaviour and the findings obtained have been supported by changes in the micro structure of the samples which were effected by waste liquids. In order to understand the micro sized changes, chemical analysis (XRF), mineralogy analysis (XRD) and electron microscope analysis (ESEM) have been used.

In the study with leachate, it is observed that the latter changes the structure of the clay to streaked and cavernous type, and also turns smectite mineral in its structure to illite mineral. Even though it raises the liquid and plastic limits, no changes have been observed in plasticity index. At the end of compaction tests, lower density in the samples prepared with leachate and higher density in optimum water contents have been reached. During consolidation tests, the samples under the effect of leachate were more compressed than the samples prepared with water and smaller values in coefficients of permeability and consolidation have been obtained under the low stress effected by waste liquids. In the case of high stresses, the effect of leachate has disappered. Sliding resistance of the samples which obtained a new structure with leachate were higher than those of the samples which were prepared with water, and again the latter’s cohesion raised and angle of slide resistance decreased.

Only significant difference occurred in swelling behaviour during or after acids’ effects. The difference that was created by acids could not be differentiated by electron microscope images. Swelling pressure of grounds which are constantly under acids are lower than those of grounds under water. However when grounds that structured by water is exposed to acids, their swelling pressures raised by between 40% to 90%. With the effect of acids, it was observed that cohesion values of the samples decreased whereas angle of slide resistance increased.

ULAŞ Ali
Danışman : Prof. Dr. Fahriye Mazlum KILINÇKALE

Anabilim Dalı : İnşaat Mühendisliği

Mezuniyet Yılı : 2009

Tez Savunma Jürisi : Prof. Dr. Fahriye Mazlum KILINÇKALE

Prof. Dr. Abdurrahman GÜNER

Prof. Dr. Fevziye AKÖZ

Doç. Dr. Nabi YÜZER

Yrd. Doç. Dr. Hasan BİRİCİK