III. GEOTECHNICAL ENGINEERING

C. NEW PROJECTS
3. Feasibility study on the Use of Copper slag Wastes in Road and Embankment Construction
Date of Start

March 2006
Central Road Research Institute, New Delhi (R)

 

Scope and Objectives
• Feasibility of utilisation of copper slag in embankment, sub base and base layers of road pavement

• Feasibility of utilisation of copper slag in bituminous construction

• Feasibility of utilisation of copper slag in cement concrete construction
 
Methodology

Copper slag, local soils and pond ash samples will be collected from in and around the site where the construction would be carried out. Copper slag will be mixed with local soils and pond ash in the proportion in the range of 25% to 75% and their geotechnical characteristics would be evaluated. Important geotechnical tests which will be carried out include: Plasticity characteristics, Compaction characteristics, CBR and shear characteristics. Based on the results, certain mixes will be selected for use in embankment fill and sub base applications. The selected mixes will also be stabilized with cement to make it suitable for utilisation in base course of road pavement.

The feasibility of copper slag as a replacement to fine aggregates in different bituminous mixes viz. bituminous macadam, dense bituminous macadam, Semi dense bituminous concrete and Bituminous concrete would be investigated. Local aggregates of different nominal sizes 37.5 mm, 20 mm, 12 mm, 6 mm, stone dust and lime will be mixed with copper slag in different proportions to achieve the specified gradation as per MOSRTH specifications. Marshall stability tests will be conducted to arrive at mix design specifications. The feasibility of copper slag usage replacing sand in concrete mixes will also be investigated. Cube and beam samples will be casted to arrive at mix design specifications.

 
Conclusions
Design specifications will be developed for use of copper slag in embankment, sub base, base and wearing courses of road pavement
 
Significance/ Utilization Potential
Field construction would help to solve the disposal problem and facilitates the use of alternative/marginal materials in road construction.