Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Chemical Modification of Asphalts
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. 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 play a major role in controlling the adhesion to aggregate. The infrared spectra (IR) and high pressure-gel permeation chromatography (HP-GPC) support this hypothesis.
Chemical Modification of Asphalts
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. 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 play a major role in controlling the adhesion to aggregate. The infrared spectra (IR) and high pressure-gel permeation chromatography (HP-GPC) support this hypothesis.
Chemical Modification of Asphalts
D. Kumari (Autor:in) / B. H. Chollar (Autor:in) / J. A. Zenewitz (Autor:in) / J. B. Boone (Autor:in)
1992
164 pages
Report
Keine Angabe
Englisch
Construction Equipment, Materials, & Supplies , Highway Engineering , Bituminous concretes , Asphalt pavements , Pavement damage , Chemical reactions , Viscosity , Asphalts , Pavement wear , Road materials , Chromatography , Adhesion , Temperature dependence , Bonding , Molecular structure , Mechanical properties , Cracking(Fracturing)
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