Abstract
In order to study the permeability and antiblocking performance of composite specimens with double-layer permeable asphalt mixture, three types of PAC-10 asphalt mixture with different target porosity (20%, 22%, and 24%) and PAC-16 asphalt mixture with a target porosity of 22% were designed, and the double-layer Marshall specimen was fabricated through “hot + hot” method. Their orthogonal vertical sections were scanned with X-ray CT. The pore distribution and its characteristics of the specimens were analyzed by digital image analysis technology. The permeability of composite specimens was studied through penetration test, and their blocking resistances were studied through using different particle sizes of fine machine-made sands as blocking materials. The results show that the permeable capacity increases linearly with the increase of porosity. The permeable capacity of PAC-16 with 22% porosity is greater than PAC-10 (20%, 22%, and 24%) porosity. The porosity of the upper layer increases, and the permeability of the double-layer composite samples increases linearly. The critical particle size causing blocking is 0.15 mm, followed by 0.3 mm. The vertical permeability coefficient decreases exponentially with the increasing of blocking times.
Highlights
Permeable asphalt pavement is a hot issue at home and abroad [1, 2]
In order to solve this problem, a double-layer permeable asphalt pavement was proposed [12,13,14]. e upper layer is composed of porous asphalt mixture with more pores, and their size is smaller. e lower layer porous asphalt mixture has larger pores, strong permeable capacity, and antiblocking ability
While the lower layer can discharge the small particle size blocking material infiltrated from the upper layer pores under the action of water or air flow, so as to reduce the probability of blocking
Summary
Permeable asphalt pavement is a hot issue at home and abroad [1, 2]. Single-layer permeable asphalt pavement is widely used in research and application. E upper layer is composed of porous asphalt mixture with more pores, and their size is smaller. E lower layer porous asphalt mixture has larger pores, strong permeable capacity, and antiblocking ability. While the lower layer can discharge the small particle size blocking material infiltrated from the upper layer pores under the action of water or air flow, so as to reduce the probability of blocking. Hamzah et al compared the blocking resistances of double-layer porous asphalt mixture and Advances in Civil Engineering single-layer porous asphalt mixture with different particle sizes and different upper thicknesses through indoor simulated blocking tests. E results showed that a longer time should be taken to clog the composite samples with a thinner upper layer, and the double-layer porous asphalt mixture had better blocking resistance than the single-layer porous asphalt mixture [12] Hamzah et al compared the blocking resistances of double-layer porous asphalt mixture and Advances in Civil Engineering single-layer porous asphalt mixture with different particle sizes and different upper thicknesses through indoor simulated blocking tests. e results showed that a longer time should be taken to clog the composite samples with a thinner upper layer, and the double-layer porous asphalt mixture had better blocking resistance than the single-layer porous asphalt mixture [12]
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