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Rheological Modification of Bitumen with Maleic Anhydride and Dicarboxylic Acids by Philip R. Herrington; Yinqui Wu; Murray C. Forbes is a Engineering article available to read on EtoBox.

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The rheological properties of roading bitumens, modified through reaction (6 h, 150ЊC) with maleic anhydride (MAH), succinic anhydride (SAH) and various straight chain dicarboxylic acids, were investigated using capillary viscometry, penetration and dynamic shear rheometry (DSR). Chemical properties of the reaction products/blends were measured by gas chromatography, infrared spectroscopy and gel permeation chromatography. Consistent with previous work, bitumen-MAH reaction products were found to have reduced temperature sensitivity (in terms of the ratio of the complex modulus (G\*) at 5ЊC to that at 50ЊC) and be more elastic in character (decreased tan d), compared to the control. Although only 40-50% of the MAH had reacted irreversibly with the bitumen (probably by a Diels-Alder mechanism), the increase in G\* and reduction in G\* 5 /G\* 50 was greater than that achieved using SAH. For both MAH and SAH, the anhydride ring was observed to open almost immediately so that the effect on binder rheology was attributed to the resulting dicarboxylic acids. Longer chain dicarboxylic acids were also found to increase G\* and decrease tan d, the magnitude of the effects increasing with ch

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Author

Philip R. Herrington; Yinqui Wu; Murray C. Forbes

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0016-2361)

Published

1999

Language

EN

Field

Engineering (Physical Sciences)