Influence Of Mineral Fillers On Short Term Ageing Characteristics Of Asphalt Mastics

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Asphalt pavements’ deterioration due to asphalt binder ageing has been a subject of manyrnresearches. Different aspects of ageing, its causes and prevention mechanisms were the main focusrnin this researches and asphalt mixtures, mastics and neat binders have been in use for thesernpurposes. Among these material mixtures, asphalt mastics were found advantageous for theyrnresemble asphalt mixtures better than neat binders and relatively cost less during production thanrnasphalt mixtures. One way to reduce effect of ageing with mastics is to use appropriate mineralrnfillers with chemical properties to reduce chemical products of ageing or have physically capabilityrnto adsorb the molecules formed during ageing. In order to address this issue in more feasible way,rnthis paper presents experimental tests conducted to investigate the effect of using unconventionalrnand abundant filler materials (OPC, PPC, red brick powder and wood ash) as a substitute to arnconventional (limestone) filler on the industry to lessen the effect of short-term ageing. Chemical,rnmicroscopic, mechanical and rheological tests are conducted on a 60/70 bitumen, the conventionalrnand unconventional fillers as well as on mastics produced from the combination of bitumen andrndifferent filler proportions. The results are presented in terms of FTIR spectrums, microscopicrnimages and complex shear modulus (G*) master curves. Consequently, the results suggest that allrnthe fillers have a mitigating effect towards short-term ageing as the offsets in master curves ofrnaged and unaged mastics are less significant than the neat binder. Furthermore, some of the fillersrn(red brick powder in an excellent way, OPC and PPC in a medium manner) have the desiredrncharacteristics to effectively replace the conventional filler used as reference while wood ash fillerrnhas relatively the worst characteristics to serve as a replacement for limestone filler.

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Influence Of Mineral Fillers On Short Term Ageing Characteristics Of Asphalt Mastics

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