EVALUATION OF ENGINEERING PROPERTIES OF THERMAL POWER PLANT WASTE FOR SUBGRADE TREATMENT

Soft cohesive soils have low strength, high plasticity, and a large expansion ratio making them unsuitable as road subgrade. This study aims to evaluate the potential of power plant waste (fly ash) from Barapukuria Thermal Power Plant, Dinajpur, Bangladesh improve characteristics such soft soil. X-ray fluorescence test conducted classify fly ash type was identified “Class F” according “American Association State Highway Transportation Officials” "American Society for Testing Materials". Laboratory tests were on clay soil obtained Dinajpur region modified by collected waste. As Class F has cementing property, 3% cement added with it. Cement mixed 5%, 10%, 15%, 20% respectively. Specific Gravity, Atterberg limits, Modified Proctor Compaction, Unconfined Compressive Strength (UCS) California Bearing Ratio (CBR) conducted. The reveals that there is decrease in specific gravity, dry density, plasticity index addition On other hand, an increase optimum moisture content, UCS, CBR value. UCS values found be improved remarkably. Soaked value 2.79% 92.59% when treated 5% cement. this 560.36 kPa. stabilized thus meets requirements subgrade specified Local Government Engineering Department (LGED)’s design manual (2005), Bangladesh. Since possibility leaching dumping quantity pond, use plants may environment-friendly alternative its disposal ponds.