Effect of bamboo powder surface treatment on performance of asphalt binder

Abstract

For expanding the application field of bamboo and improving the utilization rate of bamboo, the effect of bamboo powder (BP) treated by NaOH on the asphalt binder’s properties was discussed on the basis of previous study on the rheological property of bamboo powder modified asphalt at high temperature. The specific surface area, pore size distribution and pore structure of NaOH treated BP were analyzed by nitrogen adsorption experiment, and its micro morphology was explained by SEM. The high temperature stability, low temperature ductility, shear deformation resistance and rut resistance of BP asphalt binder were analyzed by the softening point, the ductility, the viscosity and dynamic shear rheological test. The results showed that under the treated by NaOH, the BP epidermis produced lamellar peeling, increased the specific surface area, the surface morphology was rougher, effectively improve the surface infiltration and physical adsorption capacity of BP and the asphalt binder. Both NaOH concentration and BP content increased would play positive roles on the asphalt binder’s properties, including the high temperature stability and shear deformation resistance. But the concentration and proportion should be moderate. It is suggested that 10% of BP treated with 2.5 mol/L NaOH concentration can obtain better performance of asphalt binder. By turning waste into treasure, the effective utilization of bamboo leftovers, which is a green environmental protection material, is realized, and the asphalt binder’s properties is significantly improved under the condition of simple process and low production cost.