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Technical feasibility of direct application of the Nigerian tar sand deposits as road asphalt.
(Pacific Journal of Science and Technology, 2010) Akinmosin, A; Shoyemi, A.O
Tar sand samples were collected at five locations in parts of Southwestern Nigeria, and were analyzed to determine their direct application as road asphalt surfacing material. Seven samples were selected out fifteen samples collected in the field for this analysis using the Marshall test method. The test involved determination of bitumen saturation, stability, flow, density, specific gravity, etc. on the samples. The stability values ranged from 14.0% to 40.0%; density ranged from 1.70kg/m3 to 1.92kg/m3 , and general specific gravity values of 1.01 and 1.92 were obtained for the bitumen and mixed aggregate, respectively. The Marshall test result indicates that two out of the seven samples (AG20 and AG8) can be applied directly, having flow values of 13mm and 15mm, respectively, and with a reasonably high bitumen saturation (>30%). Other samples with low stability and low bitumen saturation (<30%) require further analysis on Design Mix which was carried out in order to increase their stability. This involved the addition of certain materials like coarse aggregate and fillers to increase the stability and wearing course of the samples. Result of the Design Mix showed increase in specific gravity, density and stability values that are favorable for direct application.