Improvement of the method of evaluation of bitumen binder adhesion

Abstract

Listen

Translate article

Abstract. Problem. Adhesion can be used as one of the general indicators of interaction between bitumen binder and mineral aggregates in asphalt concrete. From this point of view adhesion of binder to mineral surface is one of the factors that directly provides strength and performance of asphalt road pavement. More than 20 years in Ukraine adhesion properties of bitumen evaluated with a ДСТУ Б В.2.7-81-98 standard method. This method is based on evaluation of bitumen adhesion to a glass slide, which is set as a standardized surface. Nowadays the list of the positions of ДСТУ Б В.2.7-81-98 is out of date that requires an improvement of adhesion evaluation method. Goal. This research work is aimed to improve the method of evaluation of bitumen binder adhesion to a glass and mineral material surface. Methodology. To reach the goal the following experimental researches are done: the analysis of different glass slides as a standardized surface, the improvement of the preparation method of glass surface for the test, the choice of the time-temperature regimes of the test. Results. It is found that glass sides for the microscope analysis can be set as a standardized glass surface for the test. Methods of glass surface preparation and a test procedure are improved. The regimes of samples heating and exposure before the test and a time-temperature regimes of the rest is changed in comparison with ДСТУ Б В.2.7-81-98. It was found that stripping of the glass surface in water with a time can be described as a polynomial function irrelevant to the test temperature. For each bitumen binder stripping tends to reach the specific constant level during a test time and stays practically unchanged at the further exposure. Originality. On the analysis of the obtained time-temperature relations for the test samples stripping it is set the test regimes and procedure that allows correct and precision evaluation of the adhesion level for a wide range of bitumen binders with additives. Practical value. The obtained experimental data is a base of developed project of national standard ДСТУ «Bitumen and bituminous binders. Determination of resistance to stripping on glass and aggregates surface».