ABSTRACT
Several attempts were done in the last three decades to utilize waste materials through recycling, treatment, or reuse. One of the successful attempts to utilize Zebar, (a liquid by-product of olive oil, which consists mainly of oil residue) to be used in portland cement concrete (PCC) as an additive. The objective of this study is to investigate the effects of adding olive oil liquid waste (Zebar) to basecourse to improve its properties and attempt to benefit from such discarded materials.
This study was carried out to investigate the physical properties of the basecourse like optimum moisture content, California Bearing Ratio (CBR), density, permeability, shrinkage and swelling, and control fine particulates when olive oil liquid waste is used as a replacement for fresh water in roadway construction. This investigation considered properties such as optimum moisture content, dry density, penetration, swelling, dust control, and shrinkage of basecourse. A number of laboratory measurements were undertaken such as California Bearing Ratio test, compaction test, shrinkage test, dust control test, etc.
Results showed that using olive oil liquid waste as a blending additive to basecourse reduces the optimum liquid (moisture) content and increase the maximum dry density. In addition, olive oil liquid waste reduced the amount of dust to zero percent at a replacement by liquid waste of 7 % which makes it an ideal blending material for unpaved agriculture roads. The permeability of basecourse decreased with increase in the percentage of olive oil liquid waste in the basecourse providing a water tight layer. A significant improvement in CBR values were noticed with an increase in olive oil liquid waste content in roadway basecourse material.
