United States Department of Transportation
i
Chemical Modification of Asphalts
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1992-08-01
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[PDF-3.26 MB]
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Abstract:Prominent among the damages occurring to asphalt cement concrete pavements are cracking and rutting. The occurrence of such damage is dependent upon many factors including the properties of the asphalt, which are, in turn, dependent upon its molecular structure. Experiments to test this hypothesis have been performed; these experiments include the modification of asphalt cements by reacting them separately with maleic anhydride, chromium trioxide and furfural in the presence of hydrochloric acid. Six different asphalts were used in these exploratory reactions. The original and chemically modified asphalts were subjected to laboratory tests to obtain such comparative parameters as penetration-viscosity number, penetration index, limiting stiffness temperature, aging index, complex viscosity, storage modulus, loss modulus, complex modulus and tan delta. These data show that the chemically modified asphalts have potential for use in the highway pavements to help avoid cracking and rutting in such pavements. The adhesion to aggregate by the modified Wyoming pedestal test was performed. The chemical modification of asphalts improves the adhesive bond between asphalt and aggregate in an asphalt mixture implying an increased resistance to stripping. The presence of polar and polymerizing groups in the modified asphalts plays a major role in controlling the adhesion to aggregate. The infrared spectra (IR) and high pressure-gel permeation chromatography (HP- GPC) support this hypothesis.
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