Bindemittel fuer den Strassenbau

摘要

A toad surfacing binder is prepared by blowing oxygen-containing gas (air) at elevated temperature (200 DEG to 350 DEG C., preferably 225 DEG to 290 DEG C.) through a blend of:-(1) to 20 parts by weight vacuum residue from a Middle East crude and having a cut point of at least 530 DEG C. (760 mm.); and (2) 1 part by weight of an aromatic flux oil. The flux oil is preferably an aromatic extract obtained by the treatment with solvents of vacuum distillates, de-asphalted vacuum residues, and the heavy oils produced by catalytically cracking vacuum distillates. The binder has a reduced penetration. Four comparative example are described, in which eleven different binders are produced from three aromatic extracts and eight vacuum residues. Inspection data on the extracts and residues (including source and cut point), and properties of the binders are given.