Analysis of adhesive promoters karbozaline

Abstract

The quality and durability of asphalt pavement generally is a matter of strength of bond between bitumen binder and mineral aggregate surface that are presented in the asphalt. The most common way to increase the bitumen adhesion to mineral surface is adhesive promoters using. Nowadays the numerous adhesive promoters are presented on the Ukrainian market. They include production of both foreign and domestic producers, but in most cases the data on efficiency of proposed adhesive promoters are limited or absent. The aim of this research work is the estimating of the efficiency of the domestic adhesive promoter’s line “Karbozaline” in increasing the bitumen binder’s adhesion. With this original pavement bitumen is modified with the minimal and maximal amount (following the producer instructions) of “Karbozaline” line additives. The common quality indexes according actual standards DSTU 4044 and SOU 45.2-00018112-067 are found for the obtained binders. The special attention is paid for finding resistance to stripping of the additives and their thermal stability. The last one is defined as a change of binder’s adhesion to the glass surface after heating with the RTFOT method and modified TFOT method presented here. On the gained data it was found that common bitumen indexes stay merely unchanged under “Karbozaline” modification with only one exception for ductility that slightly increases. “Karbozaline” additives are improving bitumen adhesion reaching and exceeding the required minimum according SOU 45.2-00018112-067. With this “Karbozaline” additives decrease the rate of bitumen hardening, especially after the long term heating, which leads to residual penetration increasing. Meanwhile the “Karbozaline” additives have a low thermal stability. The adhesion of modified bitumen sharply decreases after heating, long term especially. Due to this the “Karbozaline” additives it is reasonable to add them directly in the bitumen line that leads to the asphalt mixer at the plant. This can save the efficiency of these additives in binder adhesion increasing.