2011 : The effect of variation index plasticity and activity in swelling vertical of expansive soil

Prof.Ir. Indrasurya Budisatria Mochtar M.Sc,Ph.D.


The expansive soil will swelling upon wetting and shrinngking to drying. This behavior can damage on construction structures, particularly, light building and road. The phenomenom is very interesting to be researched, how far the effect of variation plasticity index and actiyity toward the behavior swelling of expansive soil. The material expansive soil of selected from Soko Ngawi region East Java Privince. For to make variation of plasticity index and activity, soil from Soko (Ngawi) mixed with Na-bentonite. The research of swelling is done using remolded with diameter 6.35 cm and high 1.50 cm, with initial water content 32% and dry density 1.26 g/cm 3 with Oedometer tools. The results of research indicate, the plasticity index and activity have linear relation wuth swelling vertical. Index Terms~ The expansive of clay, Na-bentonite, plasticity index, activity, swelling vertical.