Abstract
In order to preserve natural resources, the use of waste and alternative materials in the construction and maintenance of roads is increasingly investigated. This paper presents the results of testing wearing course asphalt mixtures (AC 11s SURF 50/70) made with various percentages of fly ash, used as a partial or complete substitute for mineral filler. The properties of fly ash were determined to assess their suitability for use in asphalt mixtures. The experimental research was performed on asphalt samples containing fly ash from three different sources, with 25%, 50%, 75%, and 100% of mineral filler substitution. The control mixture was prepared with 100% of mineral filler. The paper presents the volumetric composition, stability, and flow of asphalt mixtures tested on standard Marshall’s samples, water sensitivity, and resistance to permanent deformation. The results of this study indicate that a satisfactory volumetric composition can be achieved by adding fly ash, while the bulk density and voids of the mineral and asphalt mixture generally depend on the type of fly ash and its content. The stability and flow of mixtures with fly ash are favourable compared with the control mixture. The water sensitivity of mixtures with fly ash is generally lower compared with the control mixture and depends on the type and percentage of fly ash. The resistance to permanent deformation of the asphalt mixtures depends on the fly ash type and percentage. The results obtained in this study are an important step towards broader implementation of fly ash in asphalt mixtures.
Highlights
Research ArticleReceived 14 October 2018; Revised 19 March 2019; Accepted 3 April 2019; Published 5 May 2019
A wearing course asphalt mixture with maximum aggregate size of 11 mm (AC 11s SURF 50/70) was used as the control mixture. e mixture was made of quartz-latite stone aggregate (Quarry “Stitarica,” Mojkovac, Montenegro), available in fractions 0/4, 4/8, and 8/11 mm, limestone mineral filler produced by the company “Siskovic”, Podgorica, Montenegro, and road bitumen B 50/ 70 (Oil Refinery “Pancevo,” Serbia)
Results and Discussion is section presents the results of experimental tests performed in this study, namely, volumetric composition, stability, and ow of asphalt mixtures, water resistance, and resistance to permanent deformation
Summary
Received 14 October 2018; Revised 19 March 2019; Accepted 3 April 2019; Published 5 May 2019. Sharma et al [14] found that both ITSR and RS of fly ash asphalt mixtures were equal to or higher than the corresponding values of traditional asphalt mixtures with stone filler Both ratios were decreasing with increasing fly ash content. E objective of the study presented in this paper was to investigate the impact of three fly ashes with significantly different chemical compositions on the properties of asphalt mixtures in order to get a more general conclusion regarding the possibility of using fly ash in asphalt mixtures. The objective was to evaluate the impact of different percentages of substitution of mineral filler, ranging from 25% to full substitution, on properties and performance of asphalt mixtures, including volumetric composition and resistance to water and permanent deformation
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