Abstract
In order to solve the problems of the smooth surface of basalt fiber and its weak interfacial adhesion with emulsified asphalt cold recycled mixture, a silane coupling agent (KH550) was used to treat the surface of basalt fiber and the effects of treatment concentration and soaking time on fiber modification were studied. The influence of silane coupling-modified basalt fiber (MBF) on the rheological properties of emulsified asphalt evaporation residue was studied at high and low temperatures using three routine index tests: a dynamic shear rheological test (DSR), a bending beam rheological test (BBR), and a force ductility test. The elemental changes of the fiber before and after modification and the microstructure of the emulsified asphalt evaporation residue with the coupling-modified fiber were analyzed by Fourier infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (EDS), which is used to study the modification mechanism of emulsified asphalt evaporation residue reinforced by coupling-modified fiber. The results indicate that the concentration and soaking time of the silane coupling agent have a great influence on the surface morphology and mechanical properties of the fiber, and that the optimal treatment concentration is 1.0% and the optimal soaking time is 60 min. The addition of coupling-modified fibers can reduce the phase angle and unrecoverable creep compliance of emulsified asphalt evaporation residue, increase the rutting factor and creep recovery rate, and improve the elastic recovery ability and permanent deformation resistance. However, excessive fiber will weaken the ductility of emulsified asphalt at low temperatures. The appropriate content of silane coupling-modified fiber (MBF) is 1.5%. After silane coupling modification, the fiber surface becomes rough and cohesion is enhanced between the fiber and the emulsified asphalt base. Silane coupling-modified basalt fiber (MBF) acts as reinforcement for stability and bridging cracks.
Highlights
The cold recycling technology of emulsified asphalt plant mix is energy saving and environmentally friendly, and can utilize recycled asphalt pavement (RAP) materials in large quantities, so it is a research hotspot in the field of road engineering at home and abroad [1,2,3,4]
(2) Performance silane coupling-modified fiber emulsified asphalt:asphalt: PerforPerformance was tested with the asphalt conventional performance test, the dynamic mance was tested with the asphalt conventional performance test, the dynamic shear rheological (DSR) test, thetest, bending beam rheological test (BBR), test and (BBR), the force ductility test shear rheological (DSR)
When the modified basalt fiber (MBF) dose was greater than 1.5%, the ductility decreased sharply. 3% SBR latex could dramatically improve the ductility of the emulsified asphalt evaporated residue
Summary
The cold recycling technology of emulsified asphalt plant mix is energy saving and environmentally friendly, and can utilize recycled asphalt pavement (RAP) materials in large quantities, so it is a research hotspot in the field of road engineering at home and abroad [1,2,3,4]. Emulsified asphalt cold recycled mixture has problems such as low initial strength, poor crack resistance after molding, and insufficient water stability. Deak [24] found that the use of silane coupling agents can improve the interfacial bonding properties of basalt fibers and composite materials. Scholars have seldom studied the modification mechanism and effect of basalt fiber and the performance of modified fiber-enhanced emulsified asphalt evaporation residue. Silane coupling agent was used for surface treatment of basalt fiber (BF) to improve the interface bonding and adhesion property between basalt fiber and emulsified asphalt evaporation residue. This paper considers the enhancement mechanism of coupling-modified fiber on the performance of emulsified asphalt evaporation residue, and provides theoretical reference and guidance for the popularization and application of fiber in emulsified asphalt cold recycling mixture
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