CRACKED SOIL BEHAVIOUR TREATED WITH GEOPOLYMER FOR RIVER EMBANKMENT USING A FUZZY C-MEANS METHOD

Bengawan Solo, alternatively Solo River, is listed as one of Indonesia longest rivers. In river embankments, failures often occur due to fluctuations in river water levels and climate change. Cracked soil is one of the triggers to accelerate soil saturation. Therefore, improving the soil properties of the river embankments must be carried out. Furthermore, the change of soil properties is continued due to the cycle of drying process. One of the efforts to improve soil properties is by the chemical treated soil e.g., geopolymerization. Geopolymer treated soil still has expansive characterization since the soil physical properties easily change during drying process. The composition of the geopolymer used consists of fly ash and alkali activators. MATLAB software using Fuzzy C-Means (FCM) method was operated to determine the crack intensity of cracked soil obtained from laboratory tests. The analysis results in form of image displayed that the crack patterns showing geometric features were affected by the drying process with 10% intervals of content of water decrease up to the air-drying condition was accomplished. One of the research results that have been obtained on stabilized soil and without stabilization of FAG (Fly Ash based Geopolymer) that the Crack Intensity Factor (CIF) value of 10% FAG material as stabilization was 0.99 %. Next, CIF value of soil without material stabilization was 1.16%. It was found out that the geopolymer application has been used successfully as a stabilizing material in the Bengawan Solo River embankment.