Al-Hadidi M. Th - Department of Civil Engineering, College of Engineering, University of Baghdad, Iraq
Al-Adhamii R. A. - Department of Building and construction, Dejlah university College, Baghdad, Iraq
Ali B. A. - Department of Civil Engineering, College of Engineering, University of Baghdad, Iraq

In this paper the relation between the total dissolved salts (TDS) and the hydrometer test results is found by using the statistical analysis program (SPSS). To find this relation ,a real data are used which represent the results of the hydrometer test and the corresponding results of the total dissolvedsalts test taken from tests done on Iraqi soils. A new equation is found from this relation. By using this equation the total dissolved salts (TDS) could befound easily without need to apply the ordinary usual long test. The proposed equation is presented with a proposed procedure and byapplying this equation the one could provide the time needed for testing the total dissolved salts (TDS) which last for three day. Or will at least give a preliminary value of salts ratio and reduce the numbers of tests needed. This equation gives a very good result where the correlation factor equal to (0.965) and the root square equal to (0.932).

Hydrometer, Final Reading, Total Dissolved Salts, Statistical Relation, preliminary