Characterization and thermal behavior of polymer-modified asphalt

Abstract

A styrene-butadiene-styrene modified asphalt cement was characterized by infrared, differential scanning calorimetry, thermogravimetric analysis and empirical tests such as ring and ball softening point, penetration and elastic recovery. After aging in the rolling thin-film oven, the polymer-modified asphalt presented structural changes relating to oxidation of the material. The infrared spectra showed an increase in hydroxyl groups and the formation of carbonyl compounds and sulphoxides. The percentage of crystallized fraction calculated from differential scanning calorimetry was 0.41%. Thermogravimetric analyses in inert and oxidative atmospheres revealed distinct events during thermal decomposition; the initial activation energies were similar, but changed as the process evolved

Plagiarism scandal grows in Iran

“…And two 2008 papers 6,7 on strengthening asphalt roads, co-authored by Behbahani and Ziari with PhD student Shams Noubakhat, also contain duplicated material. The first 6 includes multiple passages from three earlier papers [8][9][10] and the second 7 is also largely taken from three other papers [10][11][12] . One scientist familiar with the field, who asked to remain anonymous, says that he has difficulty making sense of the first paper's results, and that some data in it 6 are identical to those in one of the earlier papers by different researchers 8 .…”

Viscoelastic Behaviour Characterization of a Gap-graded Asphalt Mixture with SBS Polymer Modified Bitumen

“…An innovative base-course mixture was conceived as a solution to the challenge of improving the properties of bituminous mixtures while reducing the use of raw aggregates and new bitumen. The formulation of this mixture, called GB5  , takes into account two important aspects: first; the optimization of the aggregate packing for higher stiffness 1,2 ; and second, the use of SBS-polymer modified bitumen for reducing fatigue cracking and ageing [3][4][5][6][7] .…”

Laboratory Evaluation of the Stiffness Modulus of a Modified Bituminous Concrete with PR PLAST Sahara

“…The use of artificial polymers as additives, by chemical or physical combination, has led to a better performance of conservative asphalts. The thermoplastic nature of these binders has displayed the aptitude to combine property of softness, strong point and linkage to increase highways service live [6].…”