Method for researching viscosity and toughness improvement mechanism of asphalt by graphene

Abstract

The invention provides a method for researching a viscosity and toughness improvement mechanism of asphalt by graphene, which belongs to the technical field of asphalt performance enhancement, and researches a toughening mechanism of modified asphalt from the angles of binding energy of a two-phase interface and energy absorbed by fracture. The problem that evaluation is carried out only by qualitative judgment in a graphene modified asphalt toughening mechanism research method is solved. The method comprises the following steps of firstly, carrying out a viscosity and toughness test on an asphalt sample to obtain a viscosity and toughness curve and various mechanical property indexes, and analyzing through a calculation formula, then carrying out an impact resistance test and a fracture toughness test to obtain the impact absorbing energy, the borne maximum bending load and the fracture toughness of the asphalt sample under the room temperature condition, and observing the fracture notch morphology and the lattice image by using a scanning electron microscope and a transmission electron microscope, and finally, researching chemical bond change and interlayer spacing change before and after graphene is added by utilizing infrared spectroscopic analysis and X-ray diffraction test, thereby further revealing the improvement mechanism of the graphene on the viscosity and toughness of the asphalt.

Description

technical field [0001] The invention provides a research method for the mechanism of improving the viscosity and toughness of asphalt by graphene, and belongs to the technical field of asphalt performance enhancement. Background technique [0002] Most of the high-grade highways in my country are paved with asphalt materials, but ordinary petroleum asphalt pavement is prone to many diseases, such as cracking, loosening, rutting, etc., which not only reduces the service life of asphalt pavement, but also seriously affects the normal operation of vehicles. capacity. In order to improve the pavement performance of asphalt pavement, various modification technologies have emerged; the blending technology of adding a small amount of styrene-butadiene-styrene copolymer (SBS) as a modifier is most commonly used. SBS modifier has outstanding performance in high temperature, low temperature performance and anti-fatigue performance, and its market share accounts for more than 80% of mo...

AI Technical Summary

Problems solved by technology

However, due to the large difference in polarity, relative molecular mass and solubility of SBS polymer, the compatibility with base asphalt is poor. In consideration of modification effect and production cost, 3-6wt% SBS modifier is usually used

At the same time, SBS modified asphalt also has problems such as high preparation conditions and poor stability during storage, which makes it difficult to control the quality of asphalt and asphalt mixture, which affects the normal use of asphalt pavement during service.

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