Abstract
This article presents test results and examines the possibilities of using aggregate from ceramic waste for mineral-asphalt mixtures. In addition, the mineral composition, physical and mechanical properties of aggregates from natural raw materials such as dolomite, granodiorite and waste ceramic aggregate (introduced as a partial substitute for the main aggregate) were analyzed. The shape of grains was examined by determining the shape and flatness index of aggregates, resistance to grinding and frost resistance. The tested properties have a direct impact on the durability of road surfaces. To this end, the adhesion of asphalt to the surface of the aggregates used was additionally determined. Determination of surface roughness and two-dimensional (2D) topography of tested aggregates was carried out. The aggregates microstructure examination, coupled with the energy-dispersive X-ray spectroscopy (EDS) analysis, was conducted to determine the morphology and texture of the aggregates as well as to identify the basic chemical components.
Highlights
IntroductionAggregates from natural raw materials have been widely used for wear layers of asphalt surfaces
Aggregates from natural raw materials have been widely used for wear layers of asphalt surfaces.Grits from igneous, sedimentary and metamorphic rocks are most commonly used, and the use is often of a regional nature and depends on the availability of a given type of aggregate
According to Polish technical requirements [33] regarding aggregates used for the asphalt concrete wear layer, the shape index SI and the flatness index FI for coarse aggregate should not be higher than SI25 and FI25 for traffic load TL1-TL2 and SI20 and FI20 for traffic load TL3-TL6
Summary
Aggregates from natural raw materials have been widely used for wear layers of asphalt surfaces. Grits from igneous, sedimentary and metamorphic rocks are most commonly used, and the use is often of a regional nature and depends on the availability of a given type of aggregate. In Poland, basalts, granites and granodiorites, dolomites, limestones or quartzite sandstones are often used. When considering the mineral-asphalt mixture (MAM) as a two-component composite, its properties will be derived from the parameters of both asphalt and aggregate. The choice of aggregate is primarily determined by its physical and mechanical properties. Basic properties of aggregates include mineralogical composition, surface texture and grain shape, dustiness, porosity, frost resistance, resistance to abrasion and polishing, and asphalt absorption capacity [1,2,3,4,5]
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