Abstract
This paper studies the mechanical properties of porous asphalt concrete with styrene-butadiene-styrene (SBS) polymer modified bitumen as the binder, steel slag as the aggregate and crumb rubber and basalt fiber as modifiers. First, the appearance, mechanics, chemical composition and high-temperature stability of steel slag were studied by some equipment. Then, three kinds of porous asphalt concrete with SBS polymer modified bitumen as binder were produced, Namely, crumb rubber modified porous asphalt concrete (CR-PAC), basalt fiber modified porous asphalt concrete (BF-PAC), and basalt fiber and crumb rubber composite modified asphalt concrete (CM-PAC). Finally, the properties of the three kinds of modified PACs were studied through the Marshall test, freeze-thaw splitting test, low-temperature splitting test, permeability test, and creep test. The results showed that the crush value and abrasion value of steel slag are 15.1% and 13.5%, respectively; it has excellent strength and abrasion. In addition, the steel slag shows a porous structure and it provides an interface basis for a better bond with bitumen. For the three PACs, the results showed that the Marshall stability, water stability, and low-temperature crack resistance of CM-PAC are all the best Furthermore, CM-PAC has better rutting resistance than two single modified PACs, based on creep test results. The CM-PAC in this study can be used as a new type of pavement material.
Highlights
Porous asphalt concrete (PAC) has been widely studied in recent years because it can better cope with the adverse effects of rainfall on traffic [1,2,3,4]
Sufficient high temperature stability is a necessary property for aggregate, to study the Sufficient high temperature stability is a necessary property for aggregate, to study the highhigh-temperature performance of steel slag used in this test, this paper studied the steel slag through an temperature performance of steel slag used in this test, this paper studied the steel slag through an Simultaneous Thermal Analysis (STA) experiment
PACs prepared from steel slag as the aggregate
Summary
Porous asphalt concrete (PAC) has been widely studied in recent years because it can better cope with the adverse effects of rainfall on traffic [1,2,3,4]. The permeable pavement paved by PAC has many good service performances, its comprehensive mechanical properties are worse than traditional dense graded asphalt mixtures (such as AC, SMA, etc.) due to its inherent large void structure characteristics [17,18]. Wu et al [20] summarized the research results on open-graded friction course (OGFC) in recent years; they pointed out the reasons for the limited application of OGFC in a large range, and proposed future research directions. Xu et al [21] studied the permeability of different types of asphalt mixtures (AC, SMA, OGFC) under freeze-thaw cycles, and the results show that OGFC exhibits the worst water stability
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