Research
Cation Exchange Capacity of Clay in Greece
The soil samples which have been used to determine the C.E.C. of the Greek swelling soil, were collected from 17 districts all over the country, and the ammonium acetate method (Schofield, 1949) was used because is a commonly used method by Chemists. 54 clay soil samples were tested using the material passing the U.S. sieve No 40. Each sample was washed three times with ammonium solution to saturate the exchange sites and the exchange ions in milliequivalents per 100 gr of dry soil were determined in the leached extract by a corne flame photometer. The soil pH determination was also measured according to BS 1377: Part 3: 1990 9: The results of the measurements from 300 soil samples of the Greek territory are reported. Additionally, one attempt was made to correlate the obtained C.E.C. values with Liquid limit, Plasticity index and montmorollonite percent.
Geotechnical Properties of Problem Soils in Greece
This is a ten years research programme and it was sponsored by the Geek Ministry of Public Works, in order to prevent damage in public road services. This research program might serve as an information database for geotechnical properties of swelling soils in Greece. The purpose of this laboratory investigation firstly was to examine the engineering properties and secondly to test the geotechnical behavior as many as possible active soils throughout the Greek mainland and islands. For this, grain size analyses, Atterberg limits, x-ray analyses, shrinkage limits tests,, swell pressure in the oedometer, cation exchange capacity and pH in disturbed and undisturbed soil samples have been investigated. Also an attempt has made to correlate swell pressure and shrinkage limit, with the variables which are water dependable (liquid limit, plasticity index, moisture content), in order to determine one swell potential index and the results were very promising.
