RT - Journal Article T1 - Evaluation and modificationof chemical criterion for determining dispersive potential of clay JF - jeg YR - 2011 JO - jeg VO - 4 IS - 2 UR - http://jeg.khu.ac.ir/article-1-348-en.html SP - 917 EP - 942 K1 - Earth dams K1 - Dispersive K1 - Chemical Criterion K1 - Pinhole Test AB - One of the main methods of determining dispersive potential of clay is chemical tests. These tests are found on the basis of sodium ion as a main chemical element in dispersive clay. The examinations show that there is no correlations between results of physical tests and chemical criterions. In present research after preparing the results of tests on 18 borrow pit sources of clay materials of earth dams, we investigate the Dr. Rahimi's criterion with results of Pinhole Test and then bases on pinhole test results, we suggested the modified criterion of Dr. Rahimi's proposed general criterion. The results of investigations on the range of laboratory data shows that the correlations of Dr. Rahimi's proposed criterion with pinhole test is 63%, while this rate is 74% for our suggested modified criterion. Also it should be considered that Dr. Rahimi's criterion compiled according the results of 24 laboratory samples while suggested criterion in present research compiled according the results of 234 laboratory samples. LA eng UL http://jeg.khu.ac.ir/article-1-348-en.html M3 ER -