Effect of filler nature and content on the bituminous mastic behaviour under cyclic loads

Abstract

The role of the filler in asphalt mixtures is particularly important because of its influence on mastic behaviour. The filler improves the resistance properties of bitumen against the action of traffic loads and temperature. However, the filler can also adversely affect bitumen in mastics excessively brittle and stiff due to inappropriate design. For these reasons, it is interesting to investigate the effect of filler type and content on mastic composition. This paper presents results from a strain sweep test applied to bituminous mastics prepared with different filler types and contents at several temperatures. The obtained stiffness modulus and failure strain results provide information to assess the fatigue behaviour of the analysed mastics.Peer ReviewedPostprint (author's final draft

Shear rheology and microstructure of mining material-bitumen composites as filler replacement in asphalt mastics

“…Although the Superpave Mix Design Manual SHRP A-407 [22] indicates that filler proportion has to be defined as 'the ratio of the percent by weight of aggregate passing the 75 mm sieve to the effective asphalt binder content expressed as percent by weight of the total mix', it is commonly acknowledged that volumetric proportioning of filler in mastics could affect the physical and rheological behaviour [37,38]. This is also recognised by [22].…”

Analysis of the ageing effect on the cyclic tension–compression loading behaviour of bitumen and mastics

“…Therefore, the test protocol induces failure in a significantly shorter period than if a constant strain amplitude (time-sweep) was maintained. This test protocol has been successfully implemented before with bitumens and mastics at different temperatures [14,16]. Hence, one of the advantages of this test protocol is that it allows testing at lower temperatures (< 15ºC) than is often possible with the dynamic shear rheometer [22].…”

“…From this, uniaxial tension-compression cyclic tests have been proposed to evaluate the cracking resistance of bitumen and mastics [14,15]. Miró et al [16,17] showed the ability of this type of test to differentiate the fatigue behaviour of different bitumens, on various conditions of ageing and temperature, and to evaluate the effect of filler incorporation.…”

Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects

“…A good workability (and compactibility) leads to reduction of the mix air voids during the mixing process, provides aggregates interlock, eventually improves the final asphalt layer stiffness, and increase its moisture resistance. Compaction of mixes was found to depend on aggregate gradation in term of nominal maximum aggregate size (NMAS) [22], on the type, shape, and texture of aggregate [23,24], content and lithological nature of filler [25][26][27][28]; mixing and compaction temperature are related to content, grade and type of bitumen [24,29] and on indoor compaction methods [30][31][32].…”