Effect of heating on the physical properties of asphalt aggregates

Abstract

Asphalt is defined as a mixture of inert mineral matter, such as aggregate, mineral filler and bituminous binder in predeterminated portions. One of the most important properties of asphalt mixtures is the bitumen content. The most preferred way of asphalt binder analysis is extraction (with tricloroethylene). Because of environmental reasons extraction should be replaced with more environment friendly solution, this could be heating. But high temperatures can cause changes in the physical properties of mineral aggregates that are commonly used in asphalt mixtures causing faults in the results of the binder analysis. Eight different types (five andesites, one basalt, two dolomites) of Hungarian rocks have been tested in laboratory conditions to analyse the effect of heat on asphalt aggregates. 11/16 mm fractions were heated at 480˚C in an ignition furnace. The weight losses and grain distributions were recorded and compared. The physical parameters have shown that aggregates behave differently after burning on high temperature.As an additional result coloures and colour differences of aggregates were also observed after heating.

Impact Assessment of Asphalt Concrete in Geogrid-Reinforced-Pile-Supported Embankment During High-Speed Train Traffic

“…In contrast, asphalt concrete behaves elastically at high loading speeds or low temperatures (Yusupov et al, 2020). Devecseri (2010) also showed that asphalt concrete behaves differently after burning at high temperatures. Thus, using the behaviour of viscoelastic materials for the AC layer in a railway structure provides accurate results in terms of dynamic responses.…”

Investigation of Different Laboratory Aging Methods of Bituminous Mixtures

“…These studies have identified many interrelated factors such as; source of bitumen, bitumen type, absorption, production temperature and silo storage time etc. [11,12] The results of their studies have depicted that, laboratory aging procedures brought in similar properties to the bitumen with the field aging [6,[13][14][15][16][17][18][19].…”

Performance Evaluation of Warm Mix Asphalt Mixtures with Recycled Asphalt Pavement

“…Many ways of asphalt bitumen measurements exist such as solvent extraction using trichloroethylene, solvent extraction using an alternative solvent, ignition oven, ignition oven and solvent combination [38]. In order to determine the bitumen content within the aged bituminous mixtures, ten batches (each of 1000 grams) of RAP were prepared and extraction test was performed on each of the batch with a laboratory type centrifuge extractor called Rota Test.…”