The losses incurred due soils ekspansivity primarily on lightweight structures are staggering. Erecting moisture barrier at the road side is a combination of providing a positive treatment and construction structures necessary to control water content change in the soil layer. This study aims to determine behavior of suction, moisture barrier effects on suction head reduction, and the laboratory experimental model of suction head profile. The test model was made to resemble half of the road width with a load of 30 kPa on it, and install a concrete wall moisture barrier at road side with a depth variation of 20cm, 35cm and 50cm. Observation of time and water infiltration carried out on 8 observatories, also the amount of swelling through a dial that is placed above the concrete slab load. The results showed an increase in capillary water in front bulkhead for all variations of moisture barrier depth and water height reduction occurred in the rear bulkhead respectively 3.25%, 21.25% and 45% for the ratio of bulkhead height and expansive soil thickness h/H = 0.44, h/H = 0.78 and h/H = 1.11. Also reduction of swelling respectively by 4.46%, 52.69% and 82.53% for each ratio h/H.
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