Compressed Stabilized Earth Blocks (CSEB) has been using as a walling material since few decades. It is an environmentally friendly material but not economical in commercial application. Durability of CSEB is still under research and acceptance of CSEB by people also is a main challenge. Main ingredient that acts both positively and negatively on properties of CSEB is the presence of clay & silt. Many researches have been carried out on CSEB altering the clay content by adding sand, fly ash or similar materials. This study was carried out with the objective of establishing the feasibility of lowering clay & silt content by washing thus achieving requirements. The past research work established the optimum clay & silt in the region of 5 to 20% related to compressive strength but no firm indication of the range associated with the durability of CSEB. The test results based on a pilot study proved dry density is high with lower clay & silt below 15%. Water absorption test recorded that the water absorption is minimum between 10 to 15% of clay & silt content. The compressive strength did not show a significant drop or increase in the clay & silt range of 5% to 20%. These results conclude that the best range for clay & silt as 5% to 20% and can be best achieved by washing soils rather than mixing with sand, fly ash or any other similar material.
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