Abstract
Reusing drinking water sludge discharged during water purification is anticipated for a good use of waste materials as geotechnical materials. So far, drinking water sludge engineering properties has been studied by laboratory tests. This study was conducted to inspect the results of laboratory tests were trial construction using drinking water sludge as a backfill material of water pipe construction. Used sample was mountain sand which was widely used as a backfill material of water pipe construction, two types of drinking water sludge difference from dewatering methods which is sun dry and pressure dehydration, and mixed soil of drinking water sludge mountain sand. The settlement of road surface was measured using surveying instrument during 19 months, and field density tests were conducted in trial construction. As a result, the settlement of road surface in the drinking water sludge and mountain sand were not a significantly differences despite degree of compaction is less than 90%. Finally, this study showed the flowchart about control method for quality of drinking water sludge for use as a subgrade material based on the laboratory CBR tests.
