Assessment of the Dampness Resistance of Asphalt Concrete using a Double Filler of Waste Engine Oil and Calcium Carbide Residue

This study evaluates the moisture resistance characteristics of asphalt concrete with a dual blend of waste engine oil (WEO) and calcium carbide residue (CCR). The experimental design involved the adoption of Marshal Mix design method to prepare trial mixes with which optimum asphalt and WEO content of 5.4% and 0.3% were obtained. Preparation of CCR-modified samples involved addition of 2% to 10% CCR at 2% increments to partially replace aggregate by weighs. Marshall Stabilimeter was used to measure Marshall stability and Flow; conventional weight relationships were adopted to measure density and voids; while indirect tensile strength (ITS) indirect tensile strength ratio (ITSR), retained marshal stability (RMS) and swelling index (SI) in submerged conditions were obtained by applying relevant models. The results reveal that after submergence, ITS improved by 41% at WEO-CCR blend of 0.3% and 10% addition of CSA. ITSR after submergence was 79%, exceeding the benchmark of 75%. RMS improved with addition of WEO- CCR up to 10% under each category of submergence and stayed above the minimum threshold of 75% after submergence. SI also improved by 29.3% in addition of 10% CCR content. Therefore, it was established that WEO-CCR blend of 0.3% and 10% is optimum for enhancing moisture resistance properties. WEO-CCR combination is therefore recommended as alternative materials in pavement construction.