The Use of Aluminum Residue and Recycled Asphalt Pavement Materials to Stabilize Silty Clay Soil.

Bassam Z. Mahasneh

Mutah University, Civil and Environmental Engineering Dept.



The effectiveness of mixing Aluminum residue and Recycled Asphalt Pavement materials (RAP) with silty clay soil on the soil physical properties was discussed. The used mixing material enhances silty clay soil volume changes, bearing capacity, and reduces settlement. Different percentages of Aluminum and Asphalts by weight ranging from 2 % to 10% in increments of 2% were used to determine the enhancement in soil properties gained using these materials. Physical and mechanical testing were carried out according to applicable (American Standard for Testing and Materials); ASTM and (American Association of State Highways Officials); AASHTO testing methods.. Soil mixture of various ratios were studies in the laboratory to note the enhancements in the swelling behavior, shear strength parameters, Atterberg’s limits, optimum moisture content and the corresponding maximum dry density. Moreover, the evaluation of the bearing capacity of sub grade material were also included in this investigation. The results of this investigation showed that the addition of Aluminum residue and Recycled Asphalt materials to a Silty clay soil with proper compaction would lead to an increase in the bearing capacity, an increase in the dry density. In addition, an increase in the unconfined shear strength and a decrease of swelling and shrinkage potential of the Silty clay soil were also observed.


Key words: Aluminum residue, Recycled Asphalt materials, Bearing Capacity, Settlement, Consolidation, Triaxial test. RAP.


ASCE's Journal of Infrastructure Systems, 2015.