Influence of Swiss Fillers on Aging of Bituminous Binders and Cracking. (VSS1998/070)
Overview
Background & policy context:
The binder predominantly governs cracking in bituminous pavements. Hardening occurs during production and afterwards during use. Filler in the pavement contributes most to the surfaces of the mineral aggregates and is potentially catalytically active. Thus, the filler can influence the properties of the binder in the pavement and therefore also the tendency for cracking.
During previous research, catalytic activity of the filler on bituminous binders could be clearly proven. A marked change in binder properties suggests that fillers may play a role in ageing of binder during use and consequently may also enhance cracking.
Objectives:
In the project, Swiss fillers and binders commonly used in Switzerland were investigated to characterize fillers, binders or combinations of them being especially prone to ageing and consequently to cracking of roads in which they are used.
Main result of the project is to determine the catalytic activities of different fillers, to classify them according the properties of the fillers. To determine the ability of binder to withstand such catalytic oxidation. To evaluate the need of appropriate standardization.
Methodology:
The need for standardization will be discussed and, if the need is given, drafts for appropriate standards will be included in the final report. Test methods will be described to evaluate the risk of cracking for a given combination of filler and binder in roads.
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