Abstract:
Geotechnical investigation of Swat Expressway, from Kamal Sher Khan Interchange to Chakdara interchange, Pakistan was performed to test the soil, concrete, aggregate, and asphalt. Sub grade material falls in class A-2-4 of AASHTO classification. The plasticity index (PI) values for sub grade are 7.5% while above layers are non-plastic. The Maximum Dry Density (MDD) for sub grade was 2.139 gm/cc at 8.0% moisture content. Using Lab Density, CBR value was calculated for sub grade is 33.5%. The lab density and field density values are utilized to check field compaction of layers. The specific gravity for these aggregates after oven dry was 2.654. The bulk saturated surface dry aggregate has specific gravity of 2.692 while, apparent specific gravity of these aggregates was calculated 2.758. The water absorption was 1.432%.From various test procedures the density of layer about 2.495 with bitumen by weight of 4.06%. The compaction of asphalt is 95.92%.
