Ranking of stabilizers to stabilize/solidify dredged soil as highway construction material

Abstract

Abstract Contaminated dredged soil generally exhibits poor geotechnical, chemical properties and high organic matter content, As a result, these materials are dumped which lead to long term environmental issues and reduction of the space availability of the landfill site for the future. Similarly, dumping of bottom ash and steel slag wastes is also contributing to environmental harms worldwide. One solution to this problem is the utilization of these wastes into useful products. Thus, the objective of this study was to assess the suitability of contaminated dredged soil stabilized/solidified with cement, cement-bottom ash mix (1:1), cement-steel slag mix (1:1) as a highway subgrade material. Also, thermal treatment of dredged soil has been done to reduce organic matter and ascertain its effect on stabilization/solidification (S/S). Thereafter, specimens which fulfilled the highway subgrade material acceptance norms has been selected and ranked by well established method to select the best optimal specimen. Results revealed that DS-16CS (8% cement + 8% Ground granulated steel slag) was found to be most suitable followed by DS-20CBA (10% cement + 10% Bottom ash) whereas TDS-12CBA (6% cement and 6% bottom ash) was found to the least suitable.