Abstract
Industrial waste materials are increasingly being used in asphalt to improve pavement quality and reduce environmental impacts. The aim of this research was to test the pavement distress-related effects of using ground-granulated blast-furnace slag (GGBFS) as a filler in hot mix asphalt. There is potential for GGBFS to be integrated into Western Australian (WA) asphalt pavements. GGBFS was used as a replacement for the conventional hydrated lime (HL) filler used in mix designs of the Main Roads WA specifications. A control mixture (1.5% HL) was compared with three prototype mixtures containing 1.5%, 3% or 5% GGBFS instead of HL. To investigate their characteristics, we conducted wheel tracking tests, four-point bending tests, and assessments with an asphalt mixture performance tester (AMPT). The findings support the use of GGBFS in asphalt pavements. The mixture with 3% GGBFS had the best fatigue life, rutting resistance and AMPT results.
Highlights
The inclusion of waste in materials for pavements and geotechnical engineering projects has become a focus of research
This study offers a useful comparison and review of rutting and fatigue efficiency with filler inclusion
The same patterns emerged; increasing the filler content up to 3% improved rutting efficiency before it deteriorated with further filler
Summary
The inclusion of waste in materials for pavements and geotechnical engineering projects has become a focus of research. The complex influences of aggregate on soil mechanics [1–5] and excessive waste production create a challenge in investigating waste issues in different scenarios. Researchers across the world have used various waste materials [6–8], such as fibre and plastic, in geotechnical and pavement applications and investigated their performance. The filler used in asphalt mixes makes up a maximum of 5% of the total aggregate mass and can have a large impact on the asphalt’s properties in accordance with Western. Filler materials are defined as being finer than what would pass through a 0.075 mm sieve and play an important role in the performance of asphalt mixtures. The fillers affect the air voids in an asphalt mixture and the physical and chemical properties of bitumen
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