Comparison of Oregon state highway division Table-1 and Table-2 asphalt : final report.
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1991-12-01
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Alternative Title:Comparison of Oregon state highway division Table-1 and Table-2 asphalt, final report.
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Abstract:The objective of this study was to compare the effect of using the Oregon State Highway Division (OSHD) modified Table-1 asphalts and the OSHD modified Table-2 asphalts in asphalt concrete; the primary factors for comparison were reflective and thermal cracking. Crack information obtained prior to paving was compared to crack information obtained two years after paving.
In 1989, an overlay project was constructed in Southern Oregon. The project consisted of one control section and one test section. Witco AC-15 asphalt cement, representing TABLE-1, was used in the control section. Chevron AC-20 and Idaho AC-20 asphalt cements, representing TABLE-2, were used in the test section. After two years of service, the control section showed significantly more reflective cracking than the asphalt in reducing reflective cracking. However, the effect of cold temperatures on the development of cracking in both the control and test sections was not clear. It may be expected that TABLE-2 asphalts would have a better thermal resistance than TABLE-1 asphalt because TABLE-2 asphalts are less temperature susceptible than TABLE-1 asphalts. The study conclusions were based on limited information. Further verification, if necessary, should be conducte don a wider scale.
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