Abstract
To improve the permeability of porous asphalt concrete (PAC) with a small nominal maximum aggregate size (NMAS) of 10 mm (PAC10), a novel gradation design by excluding the 0.075–3 mm aggregate was developed. This study aims to evaluate the functional and structural performances of the novel PAC10 with various mineral filler contents, using the conventional PAC10 and 13 mm NMAS PAC (PAC13) as reference, and develop the optimum gradation of the novel PAC10. The performance properties evaluated include moisture susceptibility, durability, high-temperature stability, low-temperature cracking resistance and permeability. The results indicated that for the two conventional PACs with the same fine aggregate and mineral filler content, PAC10 had worse permeability and rutting resistance, similar moisture susceptibility and durability, and better low-temperature cracking resistance, compared with the PAC13. The novel PAC10 showed better permeability than the conventional PAC10. With the increase of the mineral filler content, the structural performance of the novel PAC10 is improved, but its permeability is decreased. With a mineral filler content of 6%, the novel PAC10 can have balanced functional and structural performances, which are equivalent to those of the conventional PAC13.
Highlights
Porous asphalt concrete (PAC) has been widely used as a road surfacing material because of its various beneficial functions, such as low traffic noise, good visibility and better friction, obtained by the drainage capability of the mixture and by the macro-texture that is created due to the gradation in rainy days [1,2,3,4,5,6,7]
When the mineral filler content is increased, more asphalt binder is needed to form the asphalt mastic, which can improve the strength of PAC with 10 mm aggregate size (PAC10) mixtures
Novel PAC10 with 6% mineral filler can have equivalent moisture susceptibility and durability compared with conventional PAC13
Summary
Porous asphalt concrete (PAC) has been widely used as a road surfacing material because of its various beneficial functions, such as low traffic noise, good visibility and better friction, obtained by the drainage capability of the mixture and by the macro-texture that is created due to the gradation in rainy days [1,2,3,4,5,6,7]. These attractive functions are mainly attributed to its high air void content Aggregate gradation is very important for PAC, because it controls the porosity of the aggregate structure, which in turn affects the permeability of PAC
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